Picture provided by Mike Sandmeier

"A very common and widespread mineral with highly variable forms and colours."

Mohs hardness: 3

Colorado Calcite - pictures and more info in the CP forums.

From Wikipedia - Calcite
"Calcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals. However, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, prisms, or various scalenohedra."
Check out the Mindat.org database for more detailed information about Calcite.

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