Presentation :
Names) :
Quartz *Rock crystal.
Etymology:
Quartz: From the German Quarz | Rock crystal: From the Greek krystallos=ice coming from the belief of an ice hardened for...
Presentation :
Names) :
Amethyst (variety of quartz).
Etymology:
Amethyst: From the Greek amethustos = which protects against drunkenness.
Group, Family:
Quartz (Cryst...
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...
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...
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...
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...
