26:
384:
423:, from which it may be distinguished by its specific gravity (3.1). Its hardness (7.5) is similar to beryl (7.5 - 8), and a bit less than that of topaz (8). It was first reported in 1792 from the
419:, fracture. The ready cleavage renders the crystals fragile with a tendency to chip, and thus detracts from its use for personal ornament. When cut, it resembles certain kinds of beryl and
489:
399:
Euclase crystals are noted for their blue color, ranging from very pale to dark blue. The mineral may also be colorless, white, or light green.
587:
628:
623:
448:
76:
198:
231:
618:
153:
Colorless, white, pale green to deep yellowish green, greenish blue, pale blue to deep blue, and light red
613:
392:
452:
66:
608:
356:
and is typically massive to fibrous as well as in slender prismatic crystals. It is related to
133:
188:
178:
501:
8:
408:
311:
221:
211:
505:
581:
519:
400:
168:
564:
404:
523:
342:
509:
259:
241:
48:
388:
376:) and other beryllium minerals. It is a product of the decomposition of beryl in
353:
86:
602:
576:
440:
281:
158:
98:
536:
456:
41:
464:
436:
291:
116:
514:
444:
350:
107:
91:
550:
377:
339:
336:
333:
25:
424:
301:
565:
Euclase in the
Handbook of Mineralogy, Mineral Data Publishers PDF
383:
468:
460:
439:
in the gold-bearing gravels of the
Sanarka (nowadays probably,
432:
580:
428:
420:
357:
463:, where it occurs with topaz. It is found rarely in the
173:
Perfect, perfect on {010}, imperfect on {110} {001}
600:
387:Euclase, 3.0 x 1.6 x 1.6 cm. Lost Hope Mine,
140:c = 4.618 ; β = 100.25°; Z = 4
591:(11th ed.). Cambridge University Press.
24:
513:
575:
551:Euclase on Mindat.org with location data
546:
544:
382:
601:
560:
558:
541:
530:
490:"IMA–CNMNC approved mineral symbols"
487:
296:May be marked in shades of deep blue
435:, where it is found with topaz and
13:
555:
14:
640:
569:
411:the name euclase, from the Greek
481:
349:(OH)). It crystallizes in the
1:
474:
403:is perfect, parallel to the
7:
10:
645:
629:Minerals described in 1792
624:Minerals in space group 14
537:Euclase data on Webmineral
427:district in the southern
393:Mashonaland West Province
320:
310:
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220:
210:
197:
187:
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167:
157:
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144:
132:
115:
97:
85:
75:
65:
47:
37:
32:
23:
18:
407:, and this suggested to
236:Transparent, translucent
588:Encyclopædia Britannica
494:Mineralogical Magazine
471:in the Austrian Alps.
396:
449:Orenburgskaya Oblast'
386:
138:a = 4.763, b = 14.29
77:Strunz classification
459:, Southeast Region,
619:Monoclinic minerals
515:10.1180/mgm.2021.43
506:2021MinM...85..291W
488:Warr, L.N. (2021).
445:Mednogorsk district
614:Beryllium minerals
397:
251:Optical properties
163:Prismatic crystals
327:
326:
111:
636:
593:
592:
584:
573:
567:
562:
553:
548:
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534:
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527:
517:
485:
418:
414:
345:mineral (BeAlSiO
260:Refractive index
242:Specific gravity
203:
105:
103:Prismatic (2/m)
54:
53:(repeating unit)
28:
16:
15:
644:
643:
639:
638:
637:
635:
634:
633:
599:
598:
597:
596:
582:"Euclase"
574:
570:
563:
556:
549:
542:
535:
531:
486:
482:
477:
455:is Ouro Prêto,
416:
412:
375:
371:
367:
363:
348:
275:
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267:
201:
139:
127:
104:
60:
52:
51:
12:
11:
5:
642:
632:
631:
626:
621:
616:
611:
595:
594:
579:, ed. (1911).
577:Chisholm, Hugh
568:
554:
540:
529:
500:(3): 291–320.
479:
478:
476:
473:
415:, easily, and
409:René Just Haüy
373:
369:
365:
361:
354:crystal system
346:
325:
324:
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308:
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304:
298:
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185:
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175:
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165:
164:
161:
155:
154:
151:
147:
146:
145:Identification
142:
141:
136:
130:
129:
125:
119:
113:
112:
101:
95:
94:
89:
87:Crystal system
83:
82:
79:
73:
72:
69:
63:
62:
58:
55:
45:
44:
39:
35:
34:
30:
29:
21:
20:
9:
6:
4:
3:
2:
641:
630:
627:
625:
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620:
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609:Nesosilicates
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606:
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589:
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572:
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472:
470:
466:
462:
458:
454:
453:type locality
450:
446:
442:
441:Sakmara River
438:
434:
430:
426:
422:
410:
406:
405:clinopinacoid
402:
394:
390:
385:
381:
379:
359:
355:
352:
344:
341:
338:
335:
331:
323:
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295:
293:
289:
285:
283:
282:Birefringence
279:
263:
261:
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253:
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243:
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235:
233:
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225:
223:
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215:
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209:
205:
200:
196:
192:
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186:
182:
180:
176:
172:
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166:
162:
160:
159:Crystal habit
156:
152:
148:
143:
137:
135:
131:
123:
120:
118:
114:
109:
102:
100:
99:Crystal class
96:
93:
90:
88:
84:
80:
78:
74:
70:
68:
64:
56:
50:
46:
43:
40:
36:
31:
27:
22:
17:
586:
571:
532:
497:
493:
483:
457:Minas Gerais
398:
329:
328:
121:
42:Nesosilicate
465:mica-schist
437:chrysoberyl
292:Pleochroism
254:Biaxial (+)
232:Diaphaneity
117:Space group
603:Categories
475:References
395:, Zimbabwe
378:pegmatites
351:monoclinic
321:References
312:Dispersion
246:2.99 - 3.1
199:Mohs scale
183:Conchoidal
108:H-M symbol
92:Monoclinic
67:IMA symbol
524:235729616
340:hydroxide
337:aluminium
334:beryllium
286:δ = 0.019
272:= 1.655 n
268:= 1.652 n
134:Unit cell
425:Orenburg
401:Cleavage
343:silicate
316:r > v
302:2V angle
216:Vitreous
202:hardness
189:Tenacity
179:Fracture
169:Cleavage
38:Category
502:Bibcode
467:of the
451:). Its
330:Euclase
276:= 1.671
193:Brittle
81:9.AE.10
57:BeAlSiO
49:Formula
33:General
19:Euclase
522:
469:Rauris
461:Brazil
433:Russia
417:κλάσις
222:Streak
212:Luster
106:(same
520:S2CID
429:Urals
421:topaz
389:Mwami
358:beryl
332:is a
226:White
150:Color
61:(OH)
510:doi
360:(Be
306:50°
206:7.5
71:Ecs
605::
585:.
557:^
543:^
518:.
508:.
498:85
496:.
492:.
447:,
443:,
431:,
413:εὖ
391:,
380:.
374:18
368:Si
364:Al
128:/a
526:.
512::
504::
372:O
370:6
366:2
362:3
347:4
274:γ
270:β
266:α
264:n
126:1
124:2
122:P
110:)
59:4
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