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Michigan Minerals
"Calcite"
http://www.minerals.net/mineral/carbonat/calcite/calcite.htm
The chemical formula is CaCO3. This is used for base of cement. Drugs used this its very helpful. To collectors it is the most extensively collected mineral. It comes in many colors or sometimes multicolored, its hardness is relatively low, its tenacity is brittle, and the fracture is conchoidal.
Quartz
http://www.minerals.net/mineral/silicate/tecto/quartz/quartz.htm
The chemical formula is SiO2. It is used in glass, as an abrasive for sandblasting and cutting soft stones. Tts tenacity is brittle and its fracture is conchoidal, and has a white streak.
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