In search of sapphire, Nagi teaches Ruri how to study sand, but Ruri prefers to hunt on a bigger scale.
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1. I-I got it!
2. Nagi-san! Can you grab a vial?
3. Finally... a real sapphire...
4. This thing's tiny!
5. I still say it's too small.
6. Of course it's small, it's from river sand.
7. Study of Sands
8. Study of Sands
9. But see how clear and beautiful it is?
10. Size aside, it's good quality.
11. You're right! After all, a gem is a gem!
12. But man, this method is rough.
13. My eyes are so tired,
and my shoulders feel tense.
14. But we'll find tons, right?
15. Actually, they're pretty hard to find.
16. This specimen is the
only one I've found so far.
17. All this hard work just
to find one tiny grain?
18. Is that a problem?
19. I got my hopes up when you said sapphire,
20. but as someone that prefers the good stuff,
21. all this meticulous work
for tiny grains feels silly.
22. It's for people who can't be bothered
to search the mountains.
23. Oh well, now that I've got
this one, I'm satisfied.
24. I can't give you that.
25. It cost me a lot of work to find it.
26. Don't be stingy!
27. You still want it after all that complaining?
28. Where did you find that, anyway?
29. You know that large bridge
on the way to the university?
30. In the river underneath.
31. That's not too far.
32. What do you say?
33. Wanna give it a shot next week?
34. Yup. I want a sapphire, too.
35. Even if this tiny scale bores me.
36. I'm not forcing you to go, you know.
37. I said I'm going!
38. Sucks I'll have to be cooped up
with that microscope.
39. I liked the mountain trips more.
40. That was go big or go home.
This is hardly as exciting.
41. Trapped in a tiny room, looking at a tiny dish.
42. It's not tiny at all.
43. You don't think so?
44. It may be a small sample, but sand
gives us a peek into a vast world.
45. You'd be surprised.
46. Tada!
47. I collected some sand!
48. Let's get to work
and get this thing over with!
49. Wow, you brought a whole bottle's worth?
50. Who said I only brought one?
51. What are you laughing for?
52. Sorry.
53. I'm just so impressed
with your determination.
54. You really went all out.
55. Yeah, I did!
56. They were heavy to take home, you know!
57. Why did you think we'd need this much?
58. 'Cause! I don't wanna
miss out on any sapphires!
59. It'll take well over a year
to search through all this.
60. That long?
61. Let me teach you how to collect sand.
62. Sapphire has a specific gravity of roughly 4.
63. Remember when we looked
for garnet? Just like that.
64. So we should look for sapphire the same way?
65. Yup.
66. Umm... So like, behind rocks
or in places with a slower current?
67. That's right.
68. You won't need as much sand
if you collect it from the right place.
69. It's good to take initiative,
but with the proper knowledge,
70. you'll be able to work more efficiently.
71. The easier, the better. Don't you think?
72. Yeah! I'm all for taking it easy!
73. All right, let's head back.
74. There's sapphire somewhere in here?
75. Nothing about this screams "vast world" to me.
76. Give it a light shake so
the grains don't overlap.
77. That'll spread out the sand evenly.
78. Start from the edge of the Petri dish
and move it at a uniform pace.
79. Okay.
80. Let me know when you find someth—
81. It's sapphire!
82. That's a different color and crystal shape.
83. This is a quartz fragment.
84. A quartz?
85. Take a look.
86. See that black octahedral crystal?
That's magnetite.
87. You mean that magnetic rock?
88. So sand isn't really just sand?
89. Of course not.
90. Try finding ore besides sapphire, too.
91. Oh, that looks like...
92. Okay, my turn! My turn!
93. I can't do this anymore!
94. I told you, you won't find much sapphire.
95. I know, but it's too hard!
96. Looking at sand through a microscope
all day is just so boring!
97. Come on, just a bit more.
98. Can't you cut me some slack?
99. What happened to all
that motivation from earlier?
100. Th-That was cause I didn't know any better.
101. Nagi-san, about what you said
the other day...
102. I still don't get how this is vast at all.
103. I'd rather look somewhere
that's actually big.
104. Ruri, where do you think
this sand came from?
105. It's from upstream, isn't it?
106. That's right. Rocks move.
107. This all traveled downstream.
108. Those grains were all once
rocks in the mountains.
109. Something we'd have to
search for on foot otherwise.
110. Those rocks accumulated over decades,
even centuries to become that sand today.
111. No rock is immune to weathering
in that time span.
112. In other words, river sand
theoretically contains
113. every rock that once
belonged in the mountains.
114. However much time we spend in the mountains,
115. it's nearly impossible to log
every type of rock there is.
116. But within that Petri dish,
that becomes possible.
117. This thing has every rock from the mountains?
118. Studying river sand isn't a last resort.
119. What seems like just a small handful
120. is actually a vast world
of an unimaginable scale.
121. Each grain of sand is proof of its own locality.
122. One grain is all it takes.
123. Find it, and it'll become the key
to locating that ore's true site.
124. Okay.
125. This one's a quartz crystal.
126. And this gold one must be... pyrite?
127. We saw them both in the mountains.
128. You think that's where this grain is from?
129. Hmm... It's certainly possible.
130. Both were further upstream, so that checks out.
131. So right now, I'm looking at
two mountains at once?
132. They were so different.
133. That place, and...
134. that other place.
135. It makes sense now.
136. This world...
137. What we see in the study of sands
138. is much bigger than I thought.
139. It may be a small specimen,
but it has immense value.
140. Yup!
141. You're right!
142. We don't have time to look
for small fragments like this.
143. We've gotta narrow down its true source
and find some giant sapphires.
144. Let's go and search the mountains!
145. Not quite yet. We'll study sands some more.
146. What? Why?
147. We've got our evidence right here!
148. Then which mountain do you suggest?
149. Well, duh!
150. Every mountain... until one day... maybe...?
151. Actually, that sounds super hard.
152. We'd have to fully cover the entire area.
153. It's much harder than typical hiking.
154. S-So more river sand?
155. Feels like a detour, if you ask me.
156. When studying river sand, we want
to identify the sapphire's source site
157. by tracing the river upstream.
158. First, we'll head upstream while
confirming the presence of specimens.
159. Found one!
160. Found one!
161. At each branch point, we'll search both sides.
162. None here.
163. Found one!
164. Once we hit a point where we can't
find any more sapphire upstream,
165. Found one!
166. None here.
167. that gives us the clues we need
to predict its actual source.
168. Locality is upstream from this point
169. Locality is downstream from this point
170. Start
171. Found one!
172. That way, we can narrow
down the area we search on foot.
173. Can't find any...
174. Found one!
175. Over there!
176. Plus, this method helps us collect
sapphire as we look for its source.
177. None here.
178. Around here!
179. Found it!
180. Collect, observe, and verify.
181. It's a cycle of legitimate research.
182. What we call a scientific approach.
183. So we have a better shot with river sand?
184. It's an evidence-based method
that leads to fewer mistakes.
185. I suggest we stick with river sand.
186. Okay! I'm on board.
187. Still, it sucks that I'll be looking
through microscopes all day.
188. What may seem like a detour
is actually a shortcut.
189. It's less work overall.
Not that it's easy, of course.
190. Not many people can stay sane doing this.
191. Well, we did find some sapphire.
192. We can end here if you want,
but there's a chance
193. we'll find bigger, prettier
sapphires if we keep looking.
194. Now that we have this, it's up to you.
195. No way I'm quitting now!
196. I can look through microscopes all day!
197. There's sapphire still out there.
198. I swear I'll find its real source!
199. Nagi's Respite
200. As famous as sapphire is as a gemstone, it's actually known as corundum in mineralogical terms. Corundum consists of oxygen and aluminum and doesn't include any especially rare elements. While beautiful gemstones are mostly found overseas, Japan also has several localities (if you set aside quality).
The Kiura Mine in Oita Prefecture is the only mine in Japan that ever commercially mined corundum. However, most of the
corundum extracted from the Kiura Mine was not gem-quality, and was instead used for industrial purposes.
Corundum has the second-highest hardness after diamond,
along with high heat and friction resistance, making it
useful in abrasives, firebricks, and anti-slip pavement surfaces. One familiar example is the emery board used in nail care, which is mostly made of corundum.
"Emery" is a type of rock primarily made up of corundum.
201. They're so different.
202. Nagi's Respite
203. Stones that catch people's eyes (like quartz) are often called by their own specific names. But what about the so-called “normal rocks” that can be found just about anywhere?
Rocks are classified into two main types based on how they form. One type is igneous rocks, which are formed when magma cools and solidifies. The other type is sedimentary rocks, which form when sediments accumulate thickly under water and become compressed. “Normal rocks” fall into one of these two categories.
Igneous rocks sometimes grow gems inside during the magma's cooling process, and sedimentary rocks can preserve fossils when foreign materials get mixed in during sediment accumulation.
Even so-called ordinary rocks go through extraordinary processes and can even hold extraordinary potential.
204. Sedimentary
Rock
205. Igneous Rock
206. There's no such
thing as an
"ordinary rock."
207. Can I quit already?
208. What? You just said you
were getting the hang of it.
209. I thought so...
210. But now that I'm at a branch point,
211. and I've already found sapphire on one side,
212. Found one!
213. Let's go!
214. having to search the other side just...
215. It sucks so bad having to
make sure I don't find sapphire.
216. I didn't think it'd be so grueling!
217. Knowing there's sapphire on the first side
218. makes it that much more pointless!
219. Can't we just search upstream
where we do find sapphire?
220. Doesn't work that way.
221. It's vital that we confirm
where there's no sapphire.
222. I need you to look through
everything as planned.
223. Come on! The easier, the better, right?
224. It's good enough to search one side.
225. We've looked this much
and haven't found it yet anyways.
226. Please?
227. Nope.
228. Done! No sapphire!
229. Good work.
230. Turns out I was right all along!
231. I told you it was a waste of time!
232. Nope. Even with the same results,
233. it makes a world of a difference
that we checked.
234. Easy for you to say.
You didn't have to do this work.
235. You were the one who decided
to look for sapphire, Ruri.
236. So mean! I'm just a friend
who needed some help!
237. I've got my own research to focus on.
238. But I'm wishing you luck.
239. Kiryu Higashi High School
240. 'Sup, Ruri. Wanna stop
somewhere on the way ho—
241. What's got you in a rush?
242. Prep for tomorrow!
243. Huh? What's tomorrow?
244. I'm going to the river!
245. River? What for?
246. See ya!
247. H-Hey!
248. She's gotten real flaky recently.
249. It's only sand! It's only sand!
I can get it by myself!
250. This place looks good. Perfect!
251. Step one! Narrow, smaller rivers.
252. That black sand must be magnetite.
This should work.
253. What next?
254. Might as well look in this bigger river, too!
255. This is a piece of cake.
256. Nothing I can't do myself.
257. Huh?
258. Where's my loupe?
259. Good thing I bought my own.
260. A hexagonal sapphire.
261. It's the biggest one I've found so far.
262. What if this is its source site?
263. If this is really it, then... that means...
264. No more studying sand!
265. Let's do this!
266. And you rushed straight back
and came all the way here?
267. 'C-Cause... I found that blue rock...
268. Are you talking about this chalky part?
269. Hard to say for sure, but it's most
likely a copper-based mineral.
270. Copper?
271. Yeah, that would explain
the bluish-green color.
272. It's not sapphire?
273. Sapphire (Aluminum Oxide)
274. Impurities
275. - Iron
276. - Titanium, etc.
277. There's no copper in sapphire.
278. Sapphire (Aluminum Oxide)
279. Impurities
280. - Iron
281. - Titanium, etc.
282. Sapphire (Aluminum Oxide)
283. Impurities
284. - Iron
285. - Titanium, etc.
286. Sapphire (Aluminum Oxide)
287. Impurities
288. - Iron
289. - Titanium, etc.
290. Sapphire (Aluminum Oxide)
291. Impurities
292. - Iron
293. - Titanium, etc.
294. Sapphire (Aluminum Oxide)
295. Sapphire (Aluminum Oxide)
296. But... isn't a blue-green
rock kinda rare?
297. It's gotta be, right? Please?
298. Ever heard of verdigris?
299. Verdigris
300. Like you see on bluish-green statues.
It's the same as that.
301. There are lots of copper-derived minerals.
302. That's another topic worth diving into.
303. But sapphire comes first for now.
304. So it was all a waste?
305. You got a bit ahead of yourself
looking for larger sapphires.
306. Let's not be too quick to take shortcuts.
307. Attendance
308. In
office
309. On
campus
310. Out of
office
311. Home
312. Arato
313. Imari
314. Shirasawa
315. You okay?
316. I'm here to listen if you need to vent.
317. It's Nagi-san.
318. She was the one telling me
about how to make things easier,
319. but when I try to do the same thing,
she won't let me.
320. I bet she just doesn't want me
doing my own thing.
321. She's just being a meanie!
322. I doubt that Arato-senpai would do that.
323. Hmph, you wouldn't get it.
You're too hardworking.
324. I just don't get how
I'm different from Nagi-san.
325. We're both just looking for shortcuts.
326. Let's see...
327. While Arato-senpai wants
to avoid unnecessary work,
328. you might be leaving out important steps.
329. If Senpai's approach is about work efficiency,
330. Ruri-chan, yours is about...
cutting corners?
331. Fine, I get it.
332. Nagi-san's the smart one.
333. I'm too dumb to be efficient like her.
334. Look at it from another viewpoint.
335. That's the important part.
336. It's not about how smart you are.
337. If you want to study sand more efficiently,
338. why don't you try
to better understand it first?
339. Understand sand?
340. Don't ask me.
341. My research doesn't involve sand anyway.
342. What? I thought you were giving me advice!
343. Understand... sand...?
344. Ores I've learned so far are
345. quartz, pyrite, magnetite, and sapphire.
346. Oh, and maybe placer gold.
347. Other than that, it's a total mystery.
348. Should I change how much
sand I observe at once?
349. Do I do more or less?
350. No, I'll have to look through it all anyways.
351. Unless I find a way to cut down this sand,
352. there are no shortcuts.
353. Oh no, something stuck to it.
354. Imari-san!
355. Can I borrow that?
356. I did it.
357. I cut down the amount of sand!
358. Way to go!
359. Remember what you said about sand?
360. I thought about what ore makes up
sand, and came up with...
361. Uh-oh, it's stuck to the magnet.
362. Hang on.
363. All good to go!
364. I cut down this much!
365. See, this is work efficiency!
366. So this is work efficiency!
367. Work efficiency! Work efficiency!
Work efficiency!
368. You two up to something?
369. Look at this!
370. You know how magnetite sticks to magnets?
371. I thought that might help cut down
the amount of sand.
372. That it might be... a good shortcut...
373. Ruri, you thought of that?
374. Yeah.
375. That's a great idea. Great thinking.
376. N-Nah! It didn't cut down too much.
377. It's not that big of a deal.
378. No, that adds up and makes a huge difference.
379. Let's use this method from now on.
380. Work efficiency!
381. Work efficiency!
382. Yay!
383. I think I'll call it a day.
384. Hang tight, I'll take you home.
385. Okay.
386. How's your research going, Imari-san?
387. I've made some progress.
388. Look, this is my new sample.
389. Wow... so this clear stuff is all fluorite?
390. Actually, this is a special specimen.
391. Take a look here.
392. See how the fluorite's melted on top?
393. Hmm?
394. The groundwater likely played a role in that.
395. But look at the smaller one next to it.
396. This one hasn't melted.
397. This contradiction is what makes it special.
398. It could help us learn more about that mine.
399. If they're both fluorite,
they should melt the same way.
400. Which can only mean...?
401. The smaller one... isn't fluorite?
402. Bingo!
403. I think it's scheelite, an ore with
a higher melting point than fluorite.
404. Scheelite contains tungsten,
a rare metal that was
405. Atomic Number
406. Tungsten carbide (WC), which is
formed by combining tungsten
with carbon, is a representative
type of cemented carbide.
407. really important in the past
to create artillery shells and steel.
408. I'm hoping this information
helps us find historical records.
409. But it's still a long road ahead.
410. Yeah? Looks like you're having fun, though.
411. I am having fun!
412. I couldn't tell which minerals
were which before.
413. But I've studied,
learned new things, and now...
414. Bit by bit, there are more
minerals that I can identify.
415. Sounds like your research is going well.
416. Yup! I might have sounded
preachy a second ago,
417. but it was a lesson I had to learn
for myself for my research.
418. History of Kanto Mines:
Showa Edition Part 2
419. Just like you have to understand language
before you can read books,
420. I had to understand rocks before I could
learn about their nature and history.
421. Once I learned to read rocks better,
I could follow their context.
422. I think that's what it means
to see things for yourself.
423. Yeah...
424. Sorry about the wait. Ready to go?
425. Actually, Nagi-san...
426. Can I stay a bit longer?
427. Kiryu Higashi High School
428. Heading to the river again?
429. Yup!
430. Ruri-chan, you're basically a pro at that now!