Calcite with Siderite cabinet and the bright green color

and the bright green color glows when the crystal is backlit

A very attractive display specimen from this classic locality

Wonderfully gemmy

rich red-orange colored doubly terminated "sword"-shaped crystals dramatically set atop transparent

When the piece is backlit

Calcite with Siderite cabinet and the bright green colorThis 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