Calcite and Stibnite Cluster Specimen - China 7x3” Bracelets and shape are natural and

and shape are natural and to be expected

This rare ammonite has a distinctive pattern resembling a tractor wheel

Long before the mining operations of the past century began in the Keweenaw

and to assist in the process of learning and wisdom

Calcite and Stibnite Cluster Specimen - China 7x3” Bracelets and shape are natural andThis cluster is a fantastic combination of Calcite and Stibnite showcasing a gorgeous swirl pattern throughout the specimen. This Calcite and Stibnite Cluster also exhibits a sparkle of rare coloring of greys and creams. Frm Nandon China. Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 3 as "calcite". How is calcite formed?