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high shine mica and range in hue from nearly clear to classic sea green to deep blue
from the middle Miocene around 12-16 million years ago
While in its sticky gel state
Chalcedony has a number of forms that are also considered gems of their own
fossils of Knightia eocaena and their close relatives are popular among both amateur and seasoned collectors due to their delicate preservation of detail
Chalcedony Ammonite high shine mica and rangeA 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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