Dolomite
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Dolomite formula
CaMg(CO₃)₂
Dolomite: hardness
3.5-4
Dolomite: occurence
dolostones, marbles
Dolomite: diagnostic features
only reacts with acid when powdered
Dolomite: cleavage/fracture
perfect rhombic cleavage two @ 120º-60º/subconchoidal fracture
Dolomite: crystal habit
rhombic/bladed rhombus
Dolomite: streak
white
Dolomite: color/luster
white-cream/vitreous-resinous