Peristerite Value, Price, and Jewelry Information

Moonstone (iridescent peristerite-oligoclase feldspar) (Chupa Pegmatite Field, Mesoproterozoic, 1.75 to 2.10 Ga; at or near Chupa Bay, northwestern Karelia, far-nw Russia) by James St. John, on Flickr

Peristerite

Peristerite is primarily oligoclase with a complex mixture of feldspars. It has iridescence that is either blue or white.

Peristerite Information

Data Value
Name Peristerite
Is a Variety of Albite
Colors White, blue.
Fracture Conchoidal, uneven, splintery
Hardness 6-6.5
Cleavage Perfect 2 directions
Crystallography Triclinic.
Refractive Index 1.531-1.550
Birefringence 0.007-0.011
Absorption Spectrum Not diagnostic.
Pleochroism None.
Optics Biaxial (-). 2V = 82°.
Optic Sign Biaxial -
Luster Vitreous.
Specific Gravity 2.62-2.67
Transparency Transparent.
Phenomena Schiller.

Comments

Compositions in the calcic oligoclase range (Ab76) cool and unmix to an inhomogeneous mixture of two feldspars, producing a Schiller, which in the case of peristerites is white or bluish. The effect seems to emanate within the body of the feldspar as a kind of glow.

Name

Peristerite is from the Greek word peristera, meaning pigeon.

Occurrence

Peristerite is well known from Ontario, Canada, where it is very abundant. It is also found at Kioo Hill, Kenya: S.G. 2.63; a=1.531: β= 1.535; γ= 1.539.

 

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