Cordierite
specimen number:
1052406
location:
Valberg, Kragero, Telemark, Norway
description: Cordierite is a magnesium aluminum silicate mineral that forms in high temperature metamorphic rocks and is known for its strong pleochroism, showing different colors when viewed from different directions. Valberg in Norway is a classic locality where cordierite occurs in metamorphic gneiss and related rocks formed during regional metamorphism.
Thick prismatic crystals of cordierite terminated in measuring to 2.5 cm in size coming off matrix. Neat historical example for the species, the specimen comes with an antique label as shown at the end of the video and dates to the early 20th century. Very nice for the species.
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