Presentation :
Names) :
Onyx and Sardonyx (variety of chalcedony / variety of agate).
Etymology:
Onyx: From the Greek onux = nail or claw | Sardonyx: Probably from the contractio...
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 ...
Amethyst mineralogical properties:
Amethyst is a purple-tinted quartz crystal. It gets its color from manganese, iron and titanium. It is found particularly in South Africa, Brazil, Canada, I...
Presentation :
Names) :
Quartz*: Rock crystal.
Etymology:
Quartz: From German Quarz | Rock crystal: From the Greek krystallos = ice coming from the belief of ice hardened foreve...
Presentation :
Names) :
Chrysoprase (variety of chalcedony).
Etymology:
From the Greek khrusos = gold and prasos = leek.
Group, Family:
Quartz Family (Microcrystalline...
Presentation :
Lodolite or shaman quartz comes from mines in Brazil. It is a quartz in which we find inclusions of iron oxide, chlorite and other minerals. Lodolite is believed to have many...
