Ferro-edenite
A variety of Edenite Root Name Group
What is Ferro-edenite?
Edenite is a double chain silicate mineral of the amphibole group with the general chemical composition NaCa2Mg5(Si7Al)O22(OH)2. Edenite is named for the locality of Edenville, Orange County, New York, where it was first described.
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Key Characteristics
Characteristics of Ferro-edenite
Edenite is a biaxial positive mineral. When viewed in thin section with a petrographic microscope, it is white-gray with pale green pleochorism in plane-polarized light. Under crossed polars, its interference colors range from first order gray to first order blue.
Formation of Ferro-edenite
Edenite has been found primarily in metamorphic rocks, occurring in pods of other magnesium rich minerals within a marble formation or with garnet rich lherzolites from deep within the Earth's crust. Thus, finding edenite in the field can indicate high temperature regional metamorphism of the surrounding rocks.
Quick Facts
Physical Properties
- Color
- black, dark green
- Hardness (Mohs)
- 5 - 6
- Streak
- white
Chemical Properties
- Chemical Formula
- {Na}{Ca2}{Fe2+5}(AlSi7O22)(OH)2 The minerals in the edenite group is defined with A(Na+K+2Ca≥0,5 apfu) and C(Al+Fe3++2Ti)≤0,5 apfu and with (OH), F or Cl in the W position. Ferro-edenite is defined with A position: Na dominant C position: Fe2+ dominant W position: (OH) dominant
- Elements
- Al, Ca, Fe, H, Na, O, Si
Also Known As
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