Amphibole quartz
Trade name for certain quartz crystals with phantoms or inclusions of minerals from the amphibole group in various colors. Also called desirite. See also lodolite.
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Ammolite
Commercial name for the iridescent or “opalescent” outer surface of fossilized shell of ammonites, primarily from the Bearpaw Formation in southern Alberta, Canada. Although the…
Amorite
Trade name for ‘druzy’ quartz with chalcedony from Mexico. ‘Druzy’ means a top layer of very small crystals on a fracture surface of a rock,…
Pineapple quartz
Fantasy name used as a synonym for cactus quartz, after its resemblance to a pineapple. Learn more about quartz growthforms? Take the mini course!
Anandalite™
Unregistered commercial name for natural quartz in which rainbow colors occur due to refraction of light on internal fracture surfaces. Other names used for quartz…
Andesine labradorite
Andesine is a natural mineral that, like labradorite, belongs to the feldspar group. Today the market offers gemstones made of andesine (or andesine labradorite) that…
Ancestralite
Unregistered commercial fancy name for a red with metallic colored banded rock. This is banded iron ore, also known as Banded Iron Formation (BIF), banded…
Andean/Andes marble
Trade name used for over 25 years for hand-carved marble figurines from the Andes mountains, Peru. Mostly animal figures, but also many other decorative objects.…
Andamooka (matrix) opal
Andamooka (South Australia) is known for its light-colored opal, sometimes referred to as milk opal. Andamooka opal is also common as a mixture of the…
Andean opal (blue and pink)
Commercial name for “common” opal originating in the Andes, specifically Peru. Therefore also called Peruvian (blue/pink) opal. Available in the natural colors pink and blue.…
