Apophyllite from Poona, Maharashtra State, India

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Description

a specimen of Apophyllite from Poona, Maharashtra State, India a specific group of phyllosilicates, a class of minerals.

Mineral Group  silicate
Composition  KCa4F(Si4O10)2.8H2O
Origin  Poona, Maharashtra State, India
dimension (cm)  6x5x4
weight (g)  114
Apophyllite was defined as a mineral by the French mineralogist and crystallographer Rene Just Hauy. He named it from the Greek apo (‘away’, ‘off) and phullon (leaf), because it peels with heating. as water evaporates. This characteristic is also typical of zeolites. for which apophyllite used to be mistaken.
It occurs in needle-shaped, columnar or tabular or in the form of lamellar aggregates of perfect cleavage. The cloudy white opaque variety is called albine, from the Latin ulbus (‘white’).
Apophyllite occurs fairly abundantly in cavities of basaltic rock. phonolites, picrites (basic igneous rocks) and similar formation. The most important deposits are on the Marianska hill in the Czech Republic. in the environs of Kaiserstuhl in Germany, in Iceland, at Bergen Hill in New Jersey USA). and in Brazil where it occurs in large crystals. Similar, perfectly transparent and finely coloured crystals are also found at Poona in India. These apophyllite stones are cut and polished for collectors’ purposes.

Additional information

Weight 114 g
Dimensions 6 x 5 x 4 cm