29:
456:
In the early 2000s, red and green gemstones began to be marketed under the name of 'andesine'. After some controversy, these gemstones were subsequently discovered to have been artificially-colored.
407:
The plagioclase feldspars are a continuous solid solution series and as such the accurate identification of individual members requires detailed
684:
608:
539:
218:
251:
674:
664:
659:
465:
654:
133:
208:
198:
629:
434:
Andesine was first described in 1841 for an occurrence in the
Marmato mine, Marmato, Cauca,
8:
412:
241:
231:
435:
679:
557:
508:
496:
488:
408:
188:
669:
604:
477:
500:
416:
341:
279:
261:
174:
62:
351:
84:
648:
301:
164:
139:
96:
55:
571:
492:
485:
345:
118:
47:
516:
109:
619:
Tables of
Gemstone Identification By Roger Dedeyne, Ivo Quintens p.118
585:
520:
481:
381:
363:
180:
89:
447:
439:
423:
348:
311:
51:
28:
630:"Three Occurrences of Oregon Sunstone | Gems & Gemology"
512:
473:
469:
367:
355:
16:
Silicate mineral comprising 30 to 50 % anorthite and albite
504:
374:
359:
443:
450:
384:) is between 30 and 50%. The formula may be written as Na
169:
Crystals rare, to 2 cm; commonly massive or granular
411:study, chemical analysis or density measurements.
646:
599:Klein, Cornelis, and Cornelius S. Hurlbut, Jr.,
476:, and andesite. It characteristically occurs in
146:β = 116.3333°, γ = 89.166°; Z = 8
553:
551:
549:
547:
581:
579:
567:
565:
419:increase directly with calcium content.
595:
593:
544:
647:
79:, where Ca/(Ca + Na) is between 30–50%
576:
562:
429:
159:White, gray, green, yellow, flesh-red
590:
533:
13:
324:Requires optical/chemical analysis
14:
696:
640:
503:. It is commonly associated with
354:series. Its chemical formula is (
27:
193:Perfect on {001}, good on {010}
622:
613:
144:c = 9.16 Å; α = 93.917°,
1:
603:Wiley, 20th ed. 1985, p. 455
526:
459:
446:due to its abundance in the
7:
495:texture. It also occurs as
10:
701:
422:It is sometimes used as a
256:Transparent to translucent
685:Minerals in space group 2
328:
320:
310:
300:
278:
270:
260:
250:
240:
230:
217:
207:
197:
187:
179:Common following albite,
173:
163:
155:
150:
132:
117:
95:
83:
61:
43:
38:
26:
21:
380:, where Ca/(Ca + Na) (%
183:, and carlsbad twin laws
558:Handbook of Mineralogy
468:igneous rocks such as
442:. The name is for the
601:Manual of Mineralogy,
236:Subvitreous to pearly
491:commonly exhibiting
453:in those mountains.
316:Measured: 76° to 83°
203:Uneven to conchoidal
464:Andesine occurs in
321:Diagnostic features
142:, b = 12.9 Å,
675:Triclinic minerals
509:potassium feldspar
430:Name and discovery
413:Refractive indices
344:, a member of the
271:Optical properties
501:sedimentary rocks
478:metamorphic rocks
335:
334:
292:= 1.547 – 1.559 n
288:= 1.543 – 1.554 n
113:
692:
665:Calcium minerals
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611:
597:
588:
583:
574:
569:
560:
555:
542:
537:
436:Chocó Department
417:specific gravity
342:silicate mineral
280:Refractive index
262:Specific gravity
223:
128:
107:
104:
68:
67:(repeating unit)
31:
19:
18:
700:
699:
695:
694:
693:
691:
690:
689:
660:Sodium minerals
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572:Webmineral data
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540:Mineralienatlas
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529:
462:
432:
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387:
379:
373:
296:= 1.552 – 1.562
295:
291:
287:
221:
145:
143:
138:a = 8.155
126:
106:
102:
78:
74:
66:
65:
34:
17:
12:
11:
5:
698:
688:
687:
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657:
655:Tectosilicates
642:
641:External links
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352:solid solution
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151:Identification
148:
147:
136:
130:
129:
121:
115:
114:
99:
93:
92:
87:
85:Crystal system
81:
80:
76:
72:
71:(Ca,Na)(Al,Si)
69:
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58:
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609:0-471-80580-7
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405:
383:
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365:
361:
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353:
350:
347:
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331:
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319:
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309:
305:
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302:Birefringence
299:
283:
281:
277:
274:Biaxial (+/−)
273:
269:
265:
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259:
255:
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249:
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165:Crystal habit
162:
158:
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141:
137:
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131:
125:
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120:
116:
111:
100:
98:
97:Crystal class
94:
91:
88:
86:
82:
70:
64:
60:
57:
56:tectosilicate
53:
49:
46:
42:
37:
30:
25:
20:
624:
615:
600:
535:
493:antiperthite
466:intermediate
463:
455:
433:
421:
406:
337:
336:
123:
101:Pinacoidal (
486:amphibolite
346:plagioclase
266:2.66 – 2.68
252:Diaphaneity
119:Space group
48:plagioclase
649:Categories
586:Mindat.org
527:References
517:hornblende
499:grains in
460:Occurrence
329:References
219:Mohs scale
110:H-M symbol
680:Gemstones
521:magnetite
482:granulite
382:anorthite
306:δ = 0.009
181:pericline
134:Unit cell
90:Triclinic
670:Feldspar
497:detrital
448:andesite
440:Colombia
424:gemstone
349:feldspar
338:Andesine
312:2V angle
222:hardness
209:Tenacity
199:Fracture
189:Cleavage
175:Twinning
52:feldspar
44:Category
33:Andesine
22:Andesine
513:biotite
474:syenite
470:diorite
409:optical
398:2.7-2.5
394:1.3-1.5
390:0.3-0.5
386:0.7-0.5
226:6 – 6.5
213:Brittle
63:Formula
39:General
607:
519:, and
505:quartz
489:facies
242:Streak
232:Luster
108:(same
451:lavas
444:Andes
340:is a
246:White
156:Color
605:ISBN
415:and
484:to
480:of
651::
592:^
578:^
564:^
546:^
523:.
515:,
511:,
507:,
472:,
438:,
426:.
404:.
396:Si
392:Al
388:Ca
368:Si
366:,
364:Al
362:)(
360:Na
358:,
356:Ca
105:)
54:,
50:,
632:.
402:8
400:O
378:8
375:O
372:4
370:)
294:γ
290:β
286:α
284:n
140:Å
127:1
124:P
112:)
103:1
77:8
75:O
73:4
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