Acid and Basic Phosphates - Olivenite and Lazulite Composition
Olivenite
An arsenate and hydroxide of copper, Cu3AsO8.Cu(OH)2. Orthorhombic. Prismatic, often in acicular crystals. Also reniform, fibrous, granular. H. = 3. G. = 4.1-4.4. Fusible at 2-25. Adamantine to vitreous luster. Color olive-green to blackish green; also shades of brown and yellow to white. Traslucent to opaque. With sodium carbonate on charcoal gives a copper globule. When ignited in C. T. with splinter of charcoal gives arsenical mirror. A little water when heated in C. T. Found rarely in oxidized portions of copper veins.
Lazulite
A phosphate of magnesium and aluminum, Mg (Al.OH)2(PO4)2, with varying amounts of ferrous iron, replacing the magnesium. Monoclinic, usually in steep pyramids. Also massive, granular, to compact. H. = 5-5.5. G. = 3.05-3.1. Vitreous luster. Azureblue color. Translucen opaque. Infusinble. B. B. Swells, loses its color and falls to pieces. Insoluble. A rare mineral.
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