Mineral Factbook

Vishnevite

Na8(Al6Si6)O24(SO4)·2H2OIMA symbol: Vhngrandfathered

Vishnevite is a silicate mineral with the formula Na8(Al6Si6)O24(SO4)·2H2O, crystallizing in the hexagonal system. It has a calculated density of 2.288 g/cm3. Its streak is white.

Photos

Vishnevite specimen photo
Vyacheslav Bukharov · CC BY-SA 4.0 · Commons
Vishnevite specimen photo
Henk Smeets – tomeikminerals.com · CC BY 4.0 · Commons
Vishnevite specimen photo
Leon Hupperichs · CC BY-SA 3.0 · Commons
Vishnevite specimen photo
Dave Dyet http://www.shutterstone.com http://www.dyet.com · Public domain · Commons

Crystallography

Crystal systemhexagonal crystal systemWikidata (CC0)
Space groupP 63
Cell (Å, °)a = 12.7228, b = 12.7228, c = 5.198; α = 90, β = 90, γ = 120
Cell volume728.672 ų, Z = 2
Axial ratios1.0000:1:0.4086calculated from COD 9010199
Source structureCOD 9010199 (American Mineralogist, 2007) — 1 of 2 structures

Physical properties

Density (calculated)2.288 g/cm³calculated from COD 9010199
Streak
whitesingle sourceWikidata (CC0)

Chemistry (calculated)

Molecular weight1030.4 g/molcalculated from the IMA formula
Composition (wt%)Na 17.85%, Al 15.71%, Si 16.35%, O 46.58%, S 3.11%, H 0.39%

Classification

Nickel-Strunz (10th)9.FB.05Wikidata (CC0)
Nickel-Strunz (9th)9.FB.05Wikidata (CC0)
Dana (8th)76.2.5.15Wikidata (CC0)