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Dogtooth spar is a speleothem that consists of large calcite crystals that form through mineral precipitation of water-borne calcite. Dogtooth spar crystals are found in caves, open spaces including veins and fractures, and geodes. They are so named for their resemblance to dog's teeth.
Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO 3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison. Large calcite crystals are used in optical equipment, and limestone composed ...
Iceland spar is characterized by its large, readily cleavable crystals, easily divided into parallelepipeds. [ 11 ] [ 12 ] This feature makes it easily identifiable and workable. One of the most remarkable properties of Iceland spar is its birefringence , where the crystal's refractive index differs for light of different polarizations.
Gaspéite is the nickel rich member of the calcite group. A solid solution series exists between all members of this group with divalent cations readily exchanged within the common crystal structure. It forms massive to reniform papillary aggregates in fractures, botryoidal concretions in laterite or fracture infill.
The rock comprising the bulk of a boulder is riddled with large cracks called septaria that radiate outward from a hollow core lined with scalenohedral calcite crystals. The process or processes that created septaria within Moeraki Boulders, and in other septarian concretions, remain an unresolved matter for which a number of possible ...
Cacoxenite, Minas de Horcajo, Castile-La Mancha, Spain Calcite colored red by inclusions of hematite, 14 × 10 × 4 cm, Tsumeb, Namibia Clear calcite with dendritic mottramite, 5 × 4.5 × 3 cm, Tsumeb, Namibia Calcite, 13.4 × 10.5 × 6.5 cm, Iraí, Rio Grande do Sul, Brazil Cobaltoan calcite, Bou Azzer District, Tazenakht, Ouarzazate Province, Souss-Massa-Draâ Region, Morocco Manganoan ...
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Smoky quartz with spessartine on top of feldspar matrix, featuring different crystal habits (shapes). In mineralogy, crystal habit is the characteristic external shape of an individual crystal or aggregate of crystals.
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