Encyclopaedia of Islam, First Edition (1913-1936)

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(1,113 words)

, Arab, al-fīrūzad̲j̲, the turquoise, a well-known precious stone of a bright green or “mountain green”. to skyblue colour with a gloss like wax; in composition it is a hydrated clay phosphate with a small but essential proportion of copper and iron. The colour is not permanent in all stones, and is said to be particularly affected by perspiration. It is almost always cut as an ornament en cabochon i. e. with a convex upper surface; only stones with an inscription are given a flat upper surface. T…

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Ruska, J., “Fīrōza”, in: Encyclopaedia of Islam, First Edition (1913-1936), Edited by M. Th. Houtsma, T.W. Arnold, R. Basset, R. Hartmann. Consulted online on 07 July 2020 <http://dx.doi.org/10.1163/2214-871X_ei1_SIM_2372>
First published online: 2012
First print edition: ISBN: 9789004082656, 1913-1936

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