2.58" Twinned Calcite Crystal on Dolomite Matrix - Missouri

This specimen contains a yellow, twinned calcite crystal that formed from a dolomite crystal encrusted matrix. This mineral cluster was collected from the Fletcher Mine in Reynolds County, Missouri. The longest calcite crystal is 2.58" long.

Calcite, CaCO3, is a carbonate mineral and the most stable polymorph of calcium carbonate. The other polymorphs are the minerals aragonite and vaterite. Calcite crystals are trigonal-rhombohedral, though actual calcite rhombohedra are rare as natural crystals. However, they show a remarkable variety of habits including acute to obtuse rhombohedra, tabular forms, and prisms. Calcite exhibits several twinning types adding to the variety of observed forms. It may occur as fibrous, granular, lamellar, or compact. Cleavage is usually in three directions parallel to the rhombohedron form.
FOR SALE
$195
DETAILS
SPECIES
Calcite & Dolomite
LOCATION
Fletcher Mine, West Fork, Reynolds County, Missouri
SIZE
2.58" long calcite 3.1 x 2.2"
CATEGORY
ITEM
#176009