Phosphates carbonates sulfates - features

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Aragonite

carbonate colorless to white rxn w/ HCl pseudohexagonal twins harder than calcite (h=3.5-4)

Siderite

carbonate light to dark brown white streak high specific gravity

Dolomite

carbonate rhombohedral crystals rxn w/ HCl when powdered fleshy colored trigonal/hexagonal

Calcite

carbonate rxn w/ HCl h=3 trigonal/hexagonal rhombohedral cleave

Apatite

phosphate Hexagonal various color h=5

Anhydrite

sulfate greyish massive (crystals rare) h=3

Gypsum

sulfate perf cleave clear white grey rosette h=2

Barite

sulfate perf cleave tabular crystals often red rosette


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