![](http://www.alamy.com/thumbs/6/F892C25A-CD58-405D-B6E8-60FC6E8A98A5/2T508ER.jpg)
Orthoclase is a potassium aluminium silicate mineral (feldspar). Crystallized sample.
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Photo credit: © José María Barres Manuel / Alamy / Afripics
License: Royalty Free
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Keywords: aluminium, close-, crystals, feldspar, geology, horizontal, mineral, mineralogy, monoclinic, orthoclase, ortoclasa, ortosa, pinkish, potassium, sample, silicate, tectosilicate