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 ...
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 ...
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 ...
Apache Tear Obsidian
Color & appearance:
Fairly translucent black, allows light to pass through. May have slightly iridescent reflections inside.
Apache Tears are a ...
Presentation :
Carnelian is a red variety of chalcedony, which is itself a cryptocrystalline variety of quartz. The formula of this mineral family is SiO2. Carnelian owes its color to hematit...
