Calcite with Siderite Petalite A beautiful example of Feldspar

A beautiful example of Feldspar from Colorado

soft yellow and white/grey color crystals of this hard-to-find species on matrix

It is a superb miniature Colorado Quartz specimen that would make a worthwhile addition to a Quartz collection

white to off-white color Hopeite crystals which vary in habit from slender “blades” to incredibly well-formed blocky orthorhombic crystals

Calcite with Siderite Petalite A beautiful example of FeldsparThis locality is a bit obscure but is known to Colorado collectors as it has produced some of the most interesting and easily identifiable Calcites from anywhere in the state. These Calcite crystals occur in septarian nodules found in the Mancos shale formation. As far as I know there are only three reported minerals from the locality all carbonates, i. e., Calcite, Siderite and Dolomite. In the early 1980s, my father collected several superb