Digital-Desert : Mojave Desert
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Geology:
Rocks, Minerals & Ores

Mineral Sequence in the Cady Mountains

Calcite scalenohedron twin

CaCO3
Cady Mountains, Mojave Desert, CA


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Mineral Sequence in the Cady Mountains



Twins - Striations

A twin is a symmetrical intergrowth of at least two crystals of the same mineral. The individuals of the twinning are related by a symmetric element which is absent in the untwinned crystal. Twins can be contact twins, penetration twins and polysynthetic twins (or mechanical twins). In a contact twin (or twin by reflection) there is definite surface (plane) separating the two individuals. In a penetration twin, very often the individuals are joined along an irregular surface.

Calcite.be

ecology: wildlife - plants - geography: places - MAPS - roads & trails: route 66 - old west - communities - weather - glossary
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