Yellow-Green Apatite Crystals in Salmon Calcite - Canada

This specimen contains greenish-yellow apatite crystals that formed within salmon colored calcite. This crystal cluster was collected from the Old Smoky Mine in Ontario, Canada. The longest apatite crystal measures .65" and the entire specimen is 1.7 x 1.6".

Apatite's bright, lustrous crystals form hexagonal shapes with off-center terminations. They are found in vugs (small cavities in rock), often associated with quartz and calcite. Many crystals are around an inch in length, though larger crystals up to about 4 inches long have been found.

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.
DETAILS
SPECIES
Apatite & Calcite
LOCATION
Old Smoky Mine, Tory Hill, Ontario, Canada
SIZE
1.7 x 1.6" Calcite. Longest apatite is .65"
CATEGORY
ITEM
#126996