Fluorescent Calcite Geode In Sandstone - Morocco

 
 
This is a sparkling half of a calcite crystal filled geode that's partially encapsulated in the matrix it was found in, collected from Aouli, Morocco. The calcite crystals are all beautifully formed and have a faint yellow coloration. Under UV light, the crystals fluoresce the typical orange color seen by other calcite specimens. The geode within the sandstone is 3" wide.

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. Its fracture is conchoidal, but difficult to obtain.
FOR SALE
$35
DETAILS
SPECIES
Calcite
LOCATION
Aouli, Morocco
SIZE
Rock 8x7.1", geode is 3" wide
CATEGORY
ITEM
#89690