A Geoscience Digital Image Library

TitleAnorthoclase, var. moonstone
DescriptionAnorthoclase, KAlSi3O8 (potasium aluminum silicate), is a polymorph of other minerals that share the same chemistry, but have different crystal structures. Anorthoclase usually has a flattened crystal habit. Moonstone comes in colorless, white, yellow, orange, and gray. It always has a white or blue sheen. That is, moonstone reflects light in a distinctive shimmering phenomenon known as adularescence.
LocationNorway. Near Larvik.
PhotographerDarla Sondrol. 2002-02-15.
CollectionWard’s Classroom Collection of Gem Minerals #28.
Key wordsanorthoclase, moonstone, Norway
Tech details444 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number2383