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 ...
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 :
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) :
Dumortierite.
Etymology:
Obsidian: Named after the Roman Obsius supposed to have discovered this stone in Ethiopia.
Group, Family:
Silic...
