Presentation :
Carnelian is a red variety of chalcedony, which itself is a cryptocrystalline variety of quartz. The formula for this family of minerals is SiO2. Carnelian owes its color to he...
Presentation :
Carnelian is a red variety of chalcedony, which itself is a cryptocrystalline variety of quartz. The formula for this family of minerals is SiO2. Carnelian owes its color to he...
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...
