1.9" Anatase Crystals, Limonite and Adularia Association - Norway

This gorgeous specimen contains an association metallic anatase crystals, cubic limonite after pyrite crystals and adularia (variety of orthoclase). It was collected from Hardangervidda, Norway and entire specimen measures 1.9 x 1.4".

This specimen has been mounted to an acrylic display base with mineral tack.

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.

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DETAILS
SPECIES
Anatase, Limonite after Pyrite & Orthoclase var. Adularia
LOCATION
Hardangervidda, Norway
SIZE
Entire specimen 1.9 x 1.4"
CATEGORY
ITEM
#177374