Silicate Minerals - Tectosilicates

Tectosilicates

Tectosilicates, or "framework silicates," have a three-dimensional framework of silicate tetrahedra with SiO₂ or a 1:2 ratio. This group comprises nearly 75% of the crust of the Earth. Tectosilicates, with the exception of the quartz group, are aluminosilicates. Nickel-Strunz classification: 09.F and 09.G, 04.DA (Quartz/ silica family)

• Quartz group
  • Quartz - SiO₂
  • Tridymite - SiO₂
  • Cristobalite - SiO₂
  • Coesite - SiO₂
• Feldspar family
  • Alkali-feldspars (potassium-feldspars)
    • Microcline - KAlSi₃O₈
    • Orthoclase - KAlSi₃O₈
    • Anorthoclase - (Na,K)AlSi₃O₈
    • Sanidine - KAlSi₃O₈
    • Albite - NaAlSi₃O₈
  • Plagioclase feldspars
    • Albite - NaAlSi₃O₈
    • Oligoclase - (Na,Ca)(Si,Al)₄O₈ (Na:Ca 4:1)
    • Andesine - (Na,Ca)(Si,Al)₄O₈ (Na:Ca 3:2)
    • Labradorite - (Na,Ca)(Si,Al)₄O₈ (Na:Ca 2:3)
    • Bytownite - (Na,Ca)(Si,Al)₄O₈ (Na:Ca 1:4)
    • Anorthite - CaAl₂Si₂O₈
• Feldspathoid family
  • Nosean - Na₈Al₆Si₆O₂₄(SO₄)
  • Cancrinite - Na₆Ca₂(CO₃,Al₆Si₆O₂₄).2H₂O
  • Leucite - KAlSi₂O₆
  • Nepheline - (Na,K)AlSiO₄
  • Sodalite - Na₈(AlSiO₄)₆Cl₂
    • Hauyne - (Na,Ca)_4-8Al₆Si₆(O,S)24(SO₄,Cl)_1-2
  • Lazurite - (Na,Ca)₈(AlSiO₄)₆(SO₄,S,Cl)₂
• Petalite - LiAlSi₄O₁₀
• Scapolite group
  • Marialite - Na₄(AlSi₃O₈)₃(Cl₂,CO₃,SO₄)
  • Meionite - Ca₄(Al₂Si₂O₈)₃(Cl₂CO₃,SO₄)
• Analcime - NaAlSi₂O₆•H₂O
• Zeolite family
  • Natrolite - Na₂Al₂Si₃O₁₀•2H₂O
  • Chabazite - CaAl₂Si₄O₁₂•6H₂O
  • Heulandite - CaAl₂Si₇O₁₈•6H₂O
  • Stilbite - NaCa₂Al₅Si₁₃O₃₆•17H₂O
  • Scolecite - CaAl₂Si₃O₁₀.3H₂O
  • Mordenite - (Ca,Na₂,K₂)Al₂Si₁₀O₂₄•7H₂O