This beautiful amethyst was mined in Romania, and grew on a cluster of Calcite crystals. In mineralogy, a pseudomorph is a mineral or mineral compound that appears in an atypical form, resulting from a substitution process in which the appearance and dimensions remain constant, but the original mineral is replaced by another. The name literally means "false form". These minerals are very rare.
The name comes from the Koine Greek ἀμέθυστος amethystos from ἀ- a-, "not" and μεθύσκω methysko/ μεθύω methyo, "intoxicate", a reference to the belief that the stone protected its owner from drunkenness. The ancient Greeks wore amethyst and carved drinking vessels from it in the belief that it would prevent intoxication.
It is one of several forms of quartz. Amethyst is a semiprecious stone and is the traditional birthstone for February.