Calcite with SideriteThis 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

An attractive miniature display specimen which plays host to a 9 mm

The Brookite is completely undamaged

A wonderful "rosette" of white Albite (var: Cleavelandite) sits in between a pair of attractive blue-green colored prismatic Amazonite crystals on the full-sized thumbnail specimen

crystallized examples like this

Without a doubt

The front side of the piece is in good shape

and not terribly attractive

Monazite is usually found in granitic pegmatites

A pair of attractive

well-formed modified pyritohedral crystals of rich golden Pyrite on contrasting black crystallized Sphalerite matrix

It is associated with a few smaller (but not small by any means) Augelites of similar quality

Here we have a good quality Boracite specimen from find the 2009 find in Bolivia