Crystalline and cryptocrystalline varieties of quartz
Quartz presents numerous crystalline varieties due to the presence of other elements during its formation, which notably change its hue o...
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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 :
Name :
Sodalite or Hackmanite.
Etymology :
Sodalite: According to chemical composition (Thomson, 1811).
Hackmanite: According to the Finnish geologist Victor Ha...
Presentation :
Names) :
Pyrite.
Etymology:
From the Greek pure=fire.
Group, Family:
Pyrite Group.
Color :
Brass yellow to metallic dark yellow "Grey-o...
Presentation :
Name :
Aventurine and Aventurine Quartz: (Variety of Quartz or Quartzite)
Etymology:
From Italian avventura = chance | NB: “Aventurine”, when written alone, descr...
