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Bronzite is sometimes cut and polished, usually in convex forms, for small ornamental objects, but its use for this purpose is less extensive than that of hypersthene. It often has a more-or-less distinct fibrous structure, and when this is pronounced the sheen has a certain resemblance to that of
199:. Here, in addition to schillerization, the original enstatite has been altered by hydration and the product has the approximate composition of serpentine. In color bastite is brown or green with the same metallic sheen as bronzite. The typical locality is Baste in the
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along the cleavage cracks of the mineral. The cleavage surfaces therefore exhibit a metallic sheen or schiller, which is even more pronounced in hypersthene than in bronzite. The color of bronzite is green or brown; its
207:, where patches of pale greyish-green bastite are embedded in a darker-colored serpentine. This rock when cut and polished makes an effective decorative stone, although little used for that purpose.
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series of the group. Rather than a distinct species, it is really a ferriferous variety of enstatite, which owing to partial alteration has acquired a bronze-like sub-metallic
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Bronzitite, thin section of a rock made of olivine and pyroxene, mostly bronzite. Photomicrograph, viewed with
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84:, with the magnesium partly replaced by small amounts (up to about 12%) of Fe. In the bronzite variety,
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91:, the iron(II) oxide ranges from about 12 to 30%, and with still more iron there is a passage to
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191:. In this connection mention may be made of an altered form of enstatite or bronzite known as
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One or more of the preceding sentences incorporates text from a publication now in the
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and optic angle increase with iron content. The enstatite endmember has a positive
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cats-eye. Masses sufficiently large for cutting are found in the norite of the
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Ore
Deposites of the United States, 1933-1967 (The Graton-Sales Volume)
256:. Vol. 4 (11th ed.). Cambridge University Press. p. 641.
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which have been derived from them. It also occurs in some crystalline
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116:, whereas bronzite and hypersthene both show a negative optic sign.
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is about 3.3–3.4, varying with the amount of iron present. The
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The
Chromite Deposits of the Stillwater Complex, Montana
271:Klein, Cornelis and Cornelius Hurlbut, Jr. (1985)
187:, and in the serpentine of Kraubat near Leoben in
119:Like enstatite, bronzite is a constituent of many
23:Bronzite variety from the Bare Hills copper mine,
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158:of bronzite composition, is noted in the
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77:Enstatite is magnesium silicate,
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27:, USA (size: 9.6 x 7.5 x 4.9 cm)
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299:Vol. 2, pp. 1495-1509, 1968
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164:Stillwater igneous complex
25:Baltimore County, Maryland
16:Pyroxene mineral variety
253:Encyclopædia Britannica
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28:
325:Orthorhombic minerals
291:Jackson, Everett D.,
273:Manual of Mineralogy,
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22:
46:is a member of the
110:refractive indices
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315:Iron(II) minerals
275:Wiley, 20th ed.,
185:Fichtel Mountains
138:, and especially
54:, belonging with
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174:Ornamental usage
106:specific gravity
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37:polarized light
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320:Pyroxene group
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244:Chisholm, Hugh
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160:cumulate rocks
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239:public domain
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197:schiller spar
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144:serpentinites
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128:igneous rocks
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64:orthorhombic
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130:, such as,
93:hypersthene
60:hypersthene
309:Categories
211:References
181:Kupferberg
156:pyroxenite
152:Bronzitite
140:peridotite
125:ultramafic
114:optic sign
101:hydroxides
86:(Mg,Fe)SiO
74:surfaces.
201:Radauthal
56:enstatite
50:group of
248:Bronzite
72:cleavage
52:minerals
48:pyroxene
44:Bronzite
241::
193:bastite
183:in the
168:Montana
162:of the
70:on the
62:to the
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189:Styria
148:schist
136:gabbro
132:norite
68:luster
121:mafic
97:oxide
79:MgSiO
277:ISBN
205:Harz
154:, a
99:and
58:and
295:in
250:".
195:or
166:of
123:to
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262:^
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88:3
81:3
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