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40-50 million years ago
see photo for small but visible crack in slab
Chalcedony has a unique crystalline structure that gives it an enormously variable appearance
These incredible collector’s pieces – each one of a kind – feature massive semitransparent calcite crystals
it is instead formally known as botryoidal purple chalcedony
Chalcedony Iceland Spar 40-50 million years agoA 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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