Presentation :
Names) :
Prehnite.
Etymology:
Named after the Dutch colonel H. von Prehn (1.733-1785) who discovered the mineral. (Werner, 1790).
Color :
Colorless, Wh...
Presentation :
Names) :
Adularia moonstone.
Etymology:
Moonstone: Referring to the bluish effect (adularescence) reminiscent of the moonlight. Trade name. | Adularia: From Mount...
Presentation :
Names) :
Onyx and Sardonyx (variety of chalcedony / variety of agate).
Etymology:
Onyx: From the Greek onux = nail or claw | Sardonyx: Probably from the contracti...
Purple Opal:
Presentation :
Opal is formed when water leaches silica and it is deposited on layers of sandy clay during a period of drought. The term opal therefore designates a family of ...
Presentation :
Names) :
Obsidian Celestial Eye.
Etymology:
Named after the Roman Obsidius, who is believed to have discovered the stone in Ethiopia.
Group, Family:...
Presentation :
Names) :
Obsidian Celestial Eye.
Etymology:
Named after the Roman Obsidius, who is believed to have discovered the stone in Ethiopia.
Group, Family:...
