Calcite with Siderite cabinet 1 cm are aesthetically set

1 cm are aesthetically set atop contrasting host rock matrix

This specimen is an impressive

Wonderfully gemmy

and the bright green color glows when the crystal is backlit

Specimen #PREH31126

Calcite with Siderite cabinet 1 cm are aesthetically setThis 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