Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Optically -\-. Axial plane i:. Acute bisectrix normal to refraction and double refraction (/J = and 2V=?,7° 46, for yellow light). In thin rock sections, Fig. 617, the outline, the distinct cleavagecracks and the frequent partial alteration to serpentine assist in itsrecognition. Physical Characters, H., to 7. Sp. gr., to , vitreous. Transparent to translucent. Streak, white or yellowish. Tenacity, , yellowish-green to brownish-red. Before Blowpipe, Etc.
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Optically -\-. Axial plane i:. Acute bisectrix normal to refraction and double refraction (/J = and 2V=?,7° 46, for yellow light). In thin rock sections, Fig. 617, the outline, the distinct cleavagecracks and the frequent partial alteration to serpentine assist in itsrecognition. Physical Characters, H., to 7. Sp. gr., to , vitreous. Transparent to translucent. Streak, white or yellowish. Tenacity, , yellowish-green to brownish-red. Before Blowpipe, Etc.—Loses color, whitens, but is infusibleunless proportion of iron is large, when it fuses to a magnetic glob-ule. Soluble in hydrochloric acid with gelatinization of silica. 372 DESCRIPTIVE MINERALOGY. Similar Species.—Differs by gelatinization from green granularpyroxene. Is harder than apatite and less fusible than tourmaline. Remarks.—Of igneous origin, occurring in basalts, traps and crystalline schists,associated with such minerals as pyroxene, enstatite, amphibole, labxadorite,
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