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
