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These highly variable pieces contain Fluorite crystal clusters within different matrixes
from the middle Miocene around 12-16 million years ago
sometimes including growth rings
textures and patterns
roughly 20 million years ago
Chalcedony Selenite These highly variable pieces containA silicone based mineral closely related to quartz and agate, Chalcedony has a unique crystalline structure that gives it an enormously variable appearance. This mineral forms in a similar fashion to agates and geodes but due to heat and pressure at the time of formation results in a distinct look and almost silky texture. Chalcedony can be found in a range of colors but most often occurs in semitransparent or white. It has a long archaeological
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