Fish eye stone, the English name Apophyllite, is derived from the Greek words Apos and Phyllazein, meaning “deciduous”, because this mineral will flake off when heated in a blowpipe flame, so it is intended.
Cichlid is a mineral of the zeolite group. It is a kind of potassium calcium silicate mineral containing crystal water combined with fluorine and hydroxylation. It belongs to the tetragonal crystal system. The crystals are short columnar, biconical, and sometimes plate, granular or block shape. It has glass luster to pearl luster, transparent to opaque, and hardness of 4.5-5.0. It is extremely rare to have colorless, branco, amarelo, green, azul, purple and pink main stones. Fisheye crystals will show light yellow fluorescence under short-wave ultraviolet radiation, sometimes showing abnormal light beams.
Because fisheye is low in hardness, brittle and easy to break, it is rarely polished and processed. It is usually used as a collection. Only colorless and green, purple or pink and other colored and transparent large crystals can be used to process faceted shapes. Gems, but rare. Treasures are also rare. The Smithsonian Museum in Washington, USA has a colorless stepped fisheye gemstone weighing 15.40 quilates; the Calgary Divo Group in Canada also collected a colorless fisheye gemstone from India weighing 7.5 quilates. All of these Extremely rare. Fisheye crystal clusters from India are very beautiful ornamental stones. Fisheye can be distinguished from similar gemstones such as chalcedony, quartz, feldspar, etc., which are colorless or green and transparent, based on its lower hardness and refractive index with the characteristics of typical pearl luster.
Fisheye is a low-temperature hot-pu mineral, which is produced in the pores of basic volcanic rock, basalt, granite, and gneiss, and coexists with zeolite, prehnite, calcite and other minerals. The main sources of fisheye stones in the world are Mexico, Brasil, os Estados Unidos, Canada, Suécia, the United Kingdom and Iceland. High-quality colorless and green fisheye stones are produced in Pune, India.
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