Collector's Guide to the Axinite Group

Different authors have expressed the formulas in various equivalent or at least consistent ways; the following idealized formulas for the four minerals emphasize their relationships and differences: ferro-axinite Ca^sub 2^Fe^sup 2+^Al^sub 2^[BSi^sub 4^O^sub 15^](OH) magnesio-axinite Ca^sub 2^MgAl^su...

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Bibliographic Details
Published in:Rocks & minerals 2007-05, Vol.82 (3), p.216-220
Main Author: Lauf, Robert J.
Format: Article
Language:English
Subjects:
Chemicals
Lead
Mineralogy
Minerals
Quartz
Single crystals
Ultraviolet radiation
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Summary:Different authors have expressed the formulas in various equivalent or at least consistent ways; the following idealized formulas for the four minerals emphasize their relationships and differences: ferro-axinite Ca^sub 2^Fe^sup 2+^Al^sub 2^[BSi^sub 4^O^sub 15^](OH) magnesio-axinite Ca^sub 2^MgAl^sub 2^[BSi^sub 4^O^sub 15^](OH) manganaxinite Ca^sub 2^Mn^sup 2+^Al^sub 2^[BSi^sub 4^O^sub 15^](OH) tinzenite CaMn^sup 2+^^sub 2^ Al^sub 2^[BSi^sub 4^O^sub 15^](OH) As one might expect, the minerals form solid-solution series from one end member to another, and zoned crystals are common. Good crystals have been collected from several places in California, but a particularly important find occurred in the early 1970s during excavation of the spillway for the New Melones Lake Dam.\n Ferroan magnesio-axinite is also found in hydrothermal veins at Lazany, Brno Batholith, Czech Republic, associated with clinozoisite and actinolite.
ISSN:0035-7529
1940-1191
DOI:10.3200/RMIN.82.3.216-221