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Apophyllite


Apophyllite

Apophyllite has got the chemical formula KCa4[F|(Si4O10)2] * 8H2O and so it is a silicate. It has got a hardness of 4 to 5 and it crystallizes in the tetragonal system. In nature we can found apophyllite in form of big and well grown crystals. Often the crystals are colorless, but through other admixtures they can have a different color. In the first moment an amateur can mix up apophyllite with rock crystal, because big apophyllites are not rare. Apophyllite crystals have got four sides and not six sides like a quartz crystal (rock crystal is also quartz) and apophyllite has got also a strong pearly gloss. There are also apophyllite crystals which have got a flat end and not a pointed end. Usually apophylite is transparent. Apophyllite can be found in India, in Germany, in Brazil, in Australia and in Iceland.

Data about Apophyllite
Chemical formula KCa4[F|(Si4O10)2] * 8H2O
Mineral class silicates
Crystal system tetragonal
Hardness 4 to 5
Density 2.3 g/cm3 to 2.4 g/cm3
Color colorless, white, green, violet
Line color white
Gloss pearly gloss
Break unevenly, inflexibly
Fissileness perfectly


Author and Webmaster: Lukas Czarnecki

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Last Update: 21.01.2006