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enstatite and ferrosilite, being a mid-way member between the two. Pure enstatite contains no iron, while pure ferrosilite contains no magnesium; hypersthene is the name given to the mineral when a significant amount of both elements are present. Enstatite is stable at atmospheric pressure, but
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is 3.4–3.9. On certain surfaces it displays a brilliant copper-red metallic sheen, or schiller, which has the same origin as the bronzy sheen of
429:
Bohlen, Steven R.; Essene, Eric J.; Boettcher, A.L. (March 1980). "Reinvestigation and application of olivine-quartz-orthopyroxene barometry".
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has furnished the most typical material; for this reason, the mineral has been known as
Labrador
259:. Many references have formally abandoned this term, preferring to categorise this mineral as
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One or more of the preceding sentences incorporates text from a publication now in the
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are rare, the mineral being usually found as foliated masses embedded in the igneous rocks
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338:, but is even more pronounced. Like bronzite, it is sometimes cut and polished as a
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at atmospheric pressure unless stabilized by magnesium or other impurities.
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and means "over strength", and is an allusion to its being harder than the
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418:. Vol. 14 (11th ed.). Cambridge University Press. p. 200.
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ferrosilite is stable only at elevated pressure, decomposing into
299:, of which it forms an essential constituent. The coarse-grained
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318:Color is often gray, brown, or green, and the
357:(a mineral with which it is often confused.
503:Enstatite-Hypersthene-Ferrosillite series
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360:Hypersthene has been discredited by the
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362:International Mineralogical Association
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345:The name "hypersthene" comes from the
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431:Earth and Planetary Science Letters
322:is usually vitreous to pearly. The
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233:mineral belonging to the group of
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303:-hypersthene-rock (norite) of
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255:as well as in stony and iron
451:10.1016/0012-821X(80)90098-9
117:{100} Perfect, {010} Perfect
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240:. Its chemical formula is
229:is a common rock-forming
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443:1980E&PSL..47....1B
415:Encyclopædia Britannica
160:Greyish white, greenish
402:Spencer, Leonard James
534:Orthorhombic minerals
287:Distinctly developed
97:Gray, brown, or green
68:Strunz classification
519:Magnesium minerals
477:. ClassicGems.net.
175:Optical properties
150:Vitreous to pearly
524:Iron(II) minerals
488:Mineral galleries
307:off the coast of
253:metamorphic rocks
247:. It is found in
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210:δ = 0.011 – 0.018
196:= 1.674 – 1.763 n
192:= 1.669 – 1.755 n
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498:Mindat locations
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332:specific gravity
330:is 5–6, and the
295:and hypersthene-
271:series with the
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184:Refractive index
166:Specific gravity
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53:(repeating unit)
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200:= 1.680 – 1.773
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410:Chisholm, Hugh
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269:solid solution
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89:Identification
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78:Crystal system
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475:"Hypersthene"
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460:2027.42/23295
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397:public domain
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305:Paul's Island
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267:. It forms a
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206:Birefringence
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529:Inosilicates
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317:
315:or paulite.
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235:orthorhombic
226:
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83:Orthorhombic
437:(1): 1–10.
406:Hypersthene
324:pleochroism
301:labradorite
265:ferrosilite
231:inosilicate
227:Hypersthene
178:Biaxial (−)
42:Inosilicate
19:Hypersthene
513:Categories
493:Webmineral
368:References
355:hornblende
313:hornblende
257:meteorites
242:(Mg,Fe)SiO
216:Dispersion
133:Mohs scale
58:(Mg,Fe)SiO
404:(1911). "
351:amphibole
261:enstatite
251:and some
238:pyroxenes
72:8/F.02-20
353:mineral
340:gemstone
336:bronzite
328:hardness
309:Labrador
297:andesite
289:crystals
282:fayalite
273:minerals
136:hardness
123:Fracture
113:Cleavage
103:Twinning
38:Category
439:Bibcode
412:(ed.).
399::
249:igneous
170:3.4–3.9
49:Formula
33:General
408:". In
393:
320:luster
293:norite
278:quartz
156:Streak
146:Luster
127:Uneven
347:Greek
140:5.5–6
94:Color
280:and
220:Weak
455:hdl
447:doi
263:or
107:On
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435:47
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376:^
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342:.
463:.
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244:3
198:γ
194:β
190:α
188:n
60:3
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