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Ferrierite from Tapu, Coromandel Peninsula, New Zealand, and a crystal chemical study of known occurrences

Published online by Cambridge University Press:  05 July 2018

T. Sameshima
T. Sameshima*
Affiliation:
Geology Department, University of Auckland, Auckland, New Zealand
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Abstract

Ferrierite has been found at Tapu, Coromandel Peninsula, New Zealand, as a mineral vein with calcite in altered hornblende andesite lava of the Miocene Beeson's Island Volcanics. The ferrierite is low in SiO2 (63.67%) and high in Al2O3 (13.75%), MgO (3.48%), and BaO(2.35%). The large a axis and cell volume (a 19.236(4), b 14.162(6), c 7.527(3) Å, V 2050 Å3) are consistent with the low SiO2, high Al2O3, high MgO chemistry. Optical orientation and optical sign (a = Z, b = X, c = Y, 2V(-)55°) of the mineral are different from those of the Lake Kamloops ferrierite reported by Graham (1918). Refractive indices α 1.487, γ 1.489, and density 2.136 were measured. Cleavage observed on (100) is perfect and on (001) is imperfect. Using data from eighteen occurrences so far reported including the Tapu mineral, the crystal chemistry of ferrierite has been studied.

Keywords

ferrieritecrystal chemistryTapuNew Zealand
Type
Mineralogy
Information
Mineralogical Magazine , Volume 50 , Issue 355 , March 1986 , pp. 63 - 68
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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