Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Altenberg. Sterling Hill, N. J. the broad face being the brachy pinacoid b while the prism m isrelatively small, v is the pyramid 2d? 2c. Angles are : mni= 103° 51; ct= 118° 49; ii=6g° 48; vv= 101° 34 Optically +, with acute bisectrix vertical. 2E for yellow light= 78° 39Physical Characters. H., to 5. Sp. gr., to Lustre, vitreous to pearly. Opaque to transparent. Streak, white. Tenacity, brittle. Color, yellow to brown, white, colorless, rarely blue or , prismatic. Before B
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . Altenberg. Sterling Hill, N. J. the broad face being the brachy pinacoid b while the prism m isrelatively small, v is the pyramid 2d? 2c. Angles are : mni= 103° 51; ct= 118° 49; ii=6g° 48; vv= 101° 34 Optically +, with acute bisectrix vertical. 2E for yellow light= 78° 39Physical Characters. H., to 5. Sp. gr., to Lustre, vitreous to pearly. Opaque to transparent. Streak, white. Tenacity, brittle. Color, yellow to brown, white, colorless, rarely blue or , prismatic. Before Blowpipe, Etc.—Fusible only in finest splinters. Withsoda and borax, on charcoal yields a white coating, which is madebright green by heating with cobalt solution. In closed tube,yields water. With acids, dissolves, leaving a gelatinous residue. Similar Species.—It is softer than prehnite, harder than cerus-site, and gelatinizes with acids. It differs from willemite in waterreaction, and from stilbite in difficulty of fusion. Remarks.—Calamine seems to be formed by the action o
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