Abstract
A new high-silica zeolite, terranovaite, was recently found in cavities of Ferrar dolerites at Mt. Adamson (Northern Victoria Land, Antarctica). The mineral [(Na4.2K0.2Mg0.2Ca3.7)S8.3(Al12.3Si67.7)S80.0O160 · . 29 H2O] occurs as globular masses that flake off in transparent lamellae; it has a vitreous luster, white streak, {010} perfect cleavage, and {001} distinct parting. The observed density is 2.13 6 0.02 g/cm 3 . Optically, it is biaxial positive, with 2V 5 658, a5 1.476, b5 1.478, g5 1.483 (all 6 0.002). The orientation is X 5 c, Y 5 a, and Z 5 b. Terranovaite is orthorhombic with a 5 9.747(1),
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