Abstract
A second occurrence of inderite (Mg2B6O11·15H2O), which was first described in 1937 by Boldyreva from the West Kazakstan, U.S.S.R., has been discovered. New chemical and powder x-ray data indicate the identity of the two materials. By Weissenberg x-ray methods the mineral is found to be triclinic with a0=8.14 Å, b0= 10.47 Å, and C0=6.33 Å. It has two good cleavages, a density of 1.860, hardness of 3, and is clear and colorless. The optical properties are: X= 1.488, Y = 1.508, Z= 1.515, and 2V = 63°.
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