The book Minerals of Colorado was written by author J S Randall Here you can read free online of Minerals of Colorado book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Minerals of Colorado a good or bad book?
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Blue Carbonate of Copper. Monoclinic; in modified oblique rhombic prisms, the crystals rather short and stout; lateral cleavage perfect. Also massive, incrusting and earthy. Lustre vitreous, almost adamantine. Color various shades of azure-blue, passing into berlin-blue. Streak blue, lighter than the color. Transpa- rent-subtranslucent. Fracture conchoidrl. Brittle. H. 3'5-52'5. G. 3'5-3'831. Comp. , carbonic acid 25'6, oxyd of copper 69'2, water 5'2. Occurs as on incrustation on the surface or...es of many of the mines throughout the state. AR. SENOPYR. ITE. Mispickel. Arsenical Pyrites. Orthorhombic ; crystallizes in right rhombic prisms, parallel to whose planes it may be cleaved ; also occurs columnar, straight and divergent; granular or* compact. Lustre metallic. Color silver-white, inclining to steel-gray. Streak dark grayish-black. Fracture uneven. Brittle. H. 5-5-6. G. G'0-6-4. Comp. , arsenic 46'0, sulphur 19'6, iron 44'4. Part of the iron sometimes replaced by cobalt. Occurs sparingly in some of the mines of Gilpin and Clear Creek Counties.
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