Mineral description : Tremolite

Tremolite pseudomorph after diopside from Storeakersvatnet, Norway.
Tremolite from Storeakersvatnet, Norway.
Fibric tremolite from Innansjön.
Chromian tremolite with calcite from Outokumpu, Finland.

Mineral class Silicates : Inosilicates : Tremolite - Glaucophane - Riebeckite group.
Chemical formula Ca2Mg5(OH,F/Si4O11)2
Crystal system Monoclinic.
Habitus As long slender prismatic crystals. Also as needle like to fibric aggregates (asbesthos).
Cleavage Fragile with two perfect cleavages in 124 degrees angle.
Hardness 5.5-6
Density 2.9
Color Often pale grayish green to white.
Luster Vitreous. Silky at fibric variants.
Occurance In scarn in metamorph rocks, especially dolomites and talky schists.
Locations A common mineral in many mines, especially in Bergslagen.
  • Falu mine, Falun, Dalarna.
  • Gåsgruvan, Persberg, Värmland.
  • Nordmark mining district, Värmland.
  • Storeakers vatnet, Norway. As pseudomorphs after diopside.
  • Outokumpu, Finland. As chromian tremolite with diopside and calcite.

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Last changed : 1998-08-23