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Orpiment

Published online by Cambridge University Press:  14 March 2018

H. A. Miers
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Extract

The crystalline form of orpiment was first determined by Mohs (Grundriss der Mineralogie (1824), 2, 613).

His measurements, which he is careful to state were only approximate, gave an angle of 79°20' for the prism, and 83°7' for the brachydome; the plane of perfect cleavage being taken as the macropinakoid, and the crystals being referred to the orthorhombic system.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 10 , Issue 45 , July 1892 , pp. 24 - 25
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1892

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