Ferri-winchite
A variety of Winchite Root Name Group
What is Ferri-winchite?
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Ferri-winchite Localities Map
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North ZoneCentral RidgeSouth Basin
Quick Facts
Physical Properties
- Color
- black
- Hardness (Mohs)
- 5.5
- Density
- 3.14 g/cm³
Chemical Properties
- Chemical Formula
- ☐[CaNa][Mg<sub>4</sub>(Fe<sup>3+</sup>,Al)]Si8O22(OH)2 The winchite-group minerals are defined as sodium-calcium amphiboles with A(Na+K+ 2Ca)<0.5 apfu and with C(Al+Fe3++2Ti)<1.5 apfu. The W position may contain (OH), F or Cl. Ferri-winchite is defined with C2+ position: Mg dominant C3+ position: Fe dominant W position: (OH) dominant.
- Elements
- Al, Ca, Fe, H, Mg, Na, O, Si
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