Mineral description : Anatase

A shiny anatase crystal from Storkingen, Jämtland.

Mineral class	Oxides : Rutil cassiterite group
Chemical formula	TiO2
Crystal system	Tetragonal.
Habitus	As sharp dipyramidal crystals.
Cleavage	Perfect basally and in four dipyramidal directions, fracture subconchoidal.
Hardness	5.5 - 6
Density	3.8 - 3.9
Color	Usually black opaque, but also exist in blue and yellow transparent crystals.
Streak	Pale yellow.
Luster	Submetallic to adamantine.
Description	Anatase is polymorph with rutile and brookite. At above 915 °r;C anatase is turned into rutile.
Occurance
Associates	Quartz, rutile, brookite, feldspar, hematite, chlorite, micas.
Notes
Locations	A rare mineral in Sweden but with some famous localities in Norway. Kjolland, Kall, Jämtland, Sweden. As small crystals together with rock crystals. Gräslotten, Offerdal, Jämtland, Sweden. As small crystals together with rock crystals. Alnön, Sundsvall, Sweden. Hardangervidda, Norway. Crystals up to 1.5 cm in size on clear quartz. The oslo field, Norway.

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Mineral group index.

Main index.

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