Mineralpedia Details for Vishnevite

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Vishnevite

Vishnevite is named for one of its co-type localities in the Vishnevy Mountains in Russia. The other type locality is in the Ilmen Mountains, also in Russia. Occurs “in poikilitic aegerine-nepheline-sodalite syenites and associated pegmatites” in few places including, additionally, Scotland, Sweden, Greenland, Tanzania, and in Colorado, USA.

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

Formula: Na₈(AlSiO₄)₆O₂₄(SO₄)·2H₂O
Crystal System: Hexagonal
Crystal Habit: Prismatic, Irregular Grains
Cleavage: Perfect, Indistinct, None
Luster: Vitreous - Pearly
Color: colorless, yellow, white, light blue, light gray
Streak: white
Class: Hexagonal - Trapezohedral
Fracture: Brittle - Uneven
Hardness: 5-6
WebMineral: View Vishnevite
Mindat: View Vishnevite

Vishnevite from Colle Rosati, Valentano, Viterbo Province, Latium, Italy

Euhedral, excellent, colorless prismatic-hexagonal crystals to about 0.75mm in vugs. Our thanks to Rossano Carlini for the help on photography and identification on this and others.

Hexagonal prismatic crystal to about 1mm