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Optical microscopic examination of orthorhombic Na2SO4 (III) in relation to its transformation to Na2SO4(I) hexagonal*

Published/Copyright: August 25, 2010
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Abstract

Optic orientation of orthorhombic Na2SO4(III) was determined as follows: X = c, Y = a and Z = b. The optic axial angle 2 Vc was measured to be ≈ 80°. The crystallographic phase transition of III into hexagonal I is discussed in the light of the optical data as well as our earlier single crystal X-ray work.

Published Online: 2010-08-25
Published in Print: 1978
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