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Mineralpedia Details for Epistolite

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Epistolite

Epistolite

Named after the Greek word epistoli, meaning letter, presumably meaning a written letter on paper, in reference to the minerals flat and rectangular crystal habit and white color. Epistolite can be found at a number of localities in only three countries which include, Greenland in the Ilimaussau intrustion, from the Lovozero Massif in Russia, and from Mont Saint-Hilaire and Saint-Amable in Canada. Epistolite can be found in alkalic pegmatites, albitites, sodalite, and hydrothermal veins.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/epistolite.pdf

Formula
Na4TiNb2(Si2O7)2O2(OH)2ยท4H2
Crystal System
Triclinic 
Crystal Habit
Platy 
Cleavage
Perfect, Distinct, None 
Luster
Pearly 
Color
white, yellowish white, gray, light brown 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle 
Hardness
1-1.5 
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Epistolite from Tugtup Agtakorfia, Ilimaussaq complex, Narsaq, Kitaa prov., Greenland

Epistolite
            from Tugtup Agtakorfia, Ilimaussaq complex, Narsaq, Kitaa prov., Greenland

Pinkish thin tabular crystals to 3mm suspended in matrix.

Click thumbnail images for larger view.

Epistolite from Kedykverpakhk Mt., Lovozero Massif, Kola Peninsula, Russia

Epistolite
            from Kedykverpakhk Mt., Lovozero Massif, Kola Peninsula, Russia

Pearly white plates to 8mm across.

Click thumbnail images for larger view.

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