Ferro-anthophyllite
A variety of Anthophyllite Root Name Group
What is Ferro-anthophyllite?
Anthophyllite is an amphibole mineral: ☐Mg2Mg5Si8O22(OH)2 (☐ is for a vacancy, a point defect in the crystal structure), magnesium iron inosilicate hydroxide. Anthophyllite is polymorphic with cummingtonite. Some forms of anthophyllite are lamellar or fibrous and are classed as asbestos. The name is derived from the Latin word anthophyllum, meaning clove, an allusion to the most common color of the mineral.
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Key Characteristics
Formation of Ferro-anthophyllite
Anthophyllite is the product of metamorphism of magnesium-rich rocks, especially ultrabasic igneous rocks and impure dolomitic shales. It also forms as a retrograde product rimming relict orthopyroxenes and olivine, and as an accessory mineral in cordierite-bearing gneisses and schists. Anthophyllite also occurs as a retrograde metamorphic mineral derived from ultramafic rocks along with serpentinite.
Quick Facts
Physical Properties
- Color
- Clove-brown to dark brown, grey to white, pale green.
- Hardness (Mohs)
- 5.5 - 6
- Streak
- White to greyish-white.
Chemical Properties
- Chemical Formula
- ☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2 The anthophyllite group are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup. The minerals in this root name group may have either Pnma or Pnmn (proto- prefixed name) space-group symmetry. The anthophyllite group's general composition is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu. Ferro-anthophyllite has a standard Pnma space-group symmetry and is defined with Fe as the dominant element both in the B and C positions.
- Elements
- Fe, H, O, Si
Also Known As
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