Anatase Crystal On Adularia - Hardangervidda, Norway

This incredible specimen contains an association of a metallic, twinned anatase crystal and adularia (variety of orthoclase). The crystals formed from a schist matrix that was collected from Hardangervidda, Norway. The anatase crystal on this specimen measures in at .45" long.

The specimen has been mounted onto an acrylic display base.

Anatase is a mineral composed of titanium dioxide that typically forms dipyramidal crystals, although variations can occur with mineral clumping. Four-pointed, X-shaped anatase crystals, while rare, have been found and are known as "X-shaped penetration twins". Horizontal striations can be seen across most anatase mineral faces and most crystals end in points, or with variations of flattening on each end. It can be found in a variety of colors, from browns and reds to greens and pinks, and can be colorless in very rare cases. However, it is most commonly black or other very dark colors due to impurities.

Adularia is a variety of feldspar that had the chemical formula KAlSi3O8. It is found most often as colorless to white aggregations within metamorphic rock, usually within cavities of crystalline schists. Adularia crystals are commonly twinned, glassy and prismatic in structure, and in some cases they display opalescent characteristics. Adularia is very similar to orthoclase, even bearing the same chemical formula, but it has a different crystalline structure and reacts differently to various tests. Its name comes from its type locality: the Adula Massif in the Alps of south-central Switzerland.
Anatase & Orthoclase var. Adularia
Hardangervidda, Norway
Entire specimen 1.5 x 1.2", .45" longest crystal