Mineral description : Vesuvianite

Vesuvianite crystal from Snösjön.
Vesuvianite crystal from Snösjön.

Mineral class Silicates : Sorosilicates : Epidote - Vesuvianite group
Chemical formula Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4
Crystal system Tetragonal.
Habitus Short striated prismatic crystals with a square cross section. Terminated by a foursided pyramide, often truncated by a pinacoide surface dominating the pyramide. Also common as massive aggregates.
Cleavage Indistinct along the crystal, fracture uneven to conchoidal.
Hardness 6.5
Density 3.27-3.45
Color Green to dark brow. Also exists in yellow, blue and purple. Translucent to transparent.
Streak White
Luster Vitreous.
Description  
Occurance In metamorphic limestones.
Associates Grossular, Diopside, Wollastonite
Notes Slightly pleocroic.
Partly soluble in hydrochloric acid.
Other names : Idocrase, Cyprine, Californite.
Type locality : Mount Vesuvios, Italy.
Locations A mineral with a number of localities in Sweden.
  • Tennberget limestone quarry, Ludvika. Commonly as brownish black crystals.
  • Hönsarvberget limestone quarry, Borlänge. Commonly as brownish black crystals.
  • Torsbo mine, Finnmossen, Värmland. As druses of yellow crystals with magnetite crystals.
  • Snösjön limestone quarry, Dalarna. As dark brownish green crystals with grossular, calcite and wollastonite.

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Last changed : 1998-07-30