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Microcline, a tektosilicate mineral with triclinic crystal forms.
Mohs hardness: 6 - 6 1/2
Common uses today - Used today in industry's for ceramics manufacturing and finishing (glazing), as well as glass production.
Colorado Microcline - pictures in the CP forums.
From Wikipedia - Microcline
"Microcline is an important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar, which is common in granite and pegmatites.
Microcline may be clear, white, pale-yellow, brick-red, or green; it is generally characterized by cross-hatch twinning that forms as a result of the transformation of monoclinic orthoclase into triclinic microcline.
Crystal Peak, Teller County, Colorado is a well-known locality for crystals of microcline."
Check out the Mindat.org database for detailed information about Microcline.
