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Calvo and Salgado 1996
central Asia
a quite common species in the phosphate quarries of the Ouled Abdoun Basin (Morocco)
a straight mesial margin and a curved lingual margin
07315 - Extremely Beautiful 3.78 Inch Brazilian Agate Slice (Chalcedony Geode Section) Psammechinus Calvo and Salgado 1996Agate is a rock consisting primarily of cryptocrystalline silica, chiefly chalcedony, alternating with microgranular quartz. It is characterized by its fineness of grain and variety of color. Although agates may be found in various kinds of host rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks. This beautiful large polished agate slices comes from southern Brazil. The stone has been soaked in a
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