Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Kai, Japan, Twinned crystals are not rare. Fig. 573 shows two crystals withtwinning plane the second order prism. Fig. S74. is an inter-growth of a right-handed. Fig. 571, and a left-handed crystal, Fig. 575 shows twin plane a:2a:2a:c,m which the verticalaxes cross almost at right angles. Optically +. With low refraction and weak double refraction(«= ; r= I-S53 foi yellow light). Circularly sections i mm. thickness turning plane of polarization foryellow light ° to
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Kai, Japan, Twinned crystals are not rare. Fig. 573 shows two crystals withtwinning plane the second order prism. Fig. S74. is an inter-growth of a right-handed. Fig. 571, and a left-handed crystal, Fig. 575 shows twin plane a:2a:2a:c,m which the verticalaxes cross almost at right angles. Optically +. With low refraction and weak double refraction(«= ; r= I-S53 foi yellow light). Circularly sections i mm. thickness turning plane of polarization foryellow light ° to right or left. 348 DESCRIPTIVE MINERALOGY. Physical Characters. H., 7. Sp. Gr., to Lustre, vitreous to greasy. Transparent to opaque. Streak, white. Tenacity, brittle to tough. Color, colorless and all , difficult, parallel to rhombohedron. Before Blowpipe, Etc.—Infusible. With soda, fuses withmarked effervescence to a clear or opaque bead, according to theproportions used. Insoluble in salt of phosphorus and slowlysoluble in borax. Insoluble in all acids excep
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