Andalusite is a naturally occurring aluminosilie mineral commonly found in metamorphic rocks. It is a highpurity mineral composed of prismatic and anhydrous crystals. Containing up to 60% alumina, andalusite transforms into mullite at low temperatures of between 1,200°C and 1,550°C. This refractory mineral offers properties such as high ...
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Most andalusite contains relatively pure Al, however, Mn and Fe may substitute Al in octahedral sites, andalusite with substantial Fe and Mn is called viridine. Pink, white, pinkish brown, violet or gray; darker colors associated with high Mn and Fe. Thin section: usually colorless in PPL, less common pink, reddishpink or slightly green ...
Andalusite Value, Price, and Jewelry Information. Strongly pleochroic, andalusite can show shades of green, brown, and red when viewed from different directions. Although tough enough for most jewelry uses, this strikingly beautiful stone is largely unknown to the gem buying public. By Joel E. Arem,, FGA, Donald Clark, CSM IMG, Barbara ...
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