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Edenite

A species of Edenite Root Name Group, Also known as Silicic 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.

Hardness:

5 - 6

General Info About Edenite

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Physical Properties of Edenite

Colors

White, grey, pale to dark green, also brown and pale pinkish-brown

Streak

White

Hardness

5 - 6 , Moderate

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Chemical Properties of Edenite

Formula

{Na}{Ca₂}{Mg₅}(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.

Edenite is defined with

A position: Na dominant

C position: Mg dominant

W position: (OH) dominant

Elements listed

Al, Ca, H, Mg, Na, O, Si

Common Impurities

Ti,Mn,K,P

Characteristics of Edenite

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Characteristics of 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 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.

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