Cat's eye, tiger's eye and aventurine quartz

The cat's eye is an attractive collectible stone in jewelry, mainly used to make artistic jewelry. It is a brittle, opaque and rare mineral.

CHEMICAL COMPOSITION

Krzemyonka 

PHYSICAL PROPERTIES

Quartz cat's eye refers to varieties of quartz containing fibrous ingrowths of other minerals. It is a translucent green-gray stone with highly visible fibers. In a variety called tiger's eye, the stripes are golden yellow to golden brown, and the background is almost black. A variety called the hawk's eye is blue-gray. The quartz cat's eye contains parallel strands of asbestos. Tiger's eye and hawk's eye result from the replacement of blue crocidolite with quartz. After its decay, residual amounts of brown iron oxides remain, which give the tiger's eye a golden brown color. The hawk's eye retains the original blue color of crocidolite.

ENTRY

Cat's eye quartz is found in Burma, India, Sri Lanka and Germany. The tiger's eye and hawk's eye are found mainly in South Africa, but also in Australia, Burma, India, and the United States.

WORK AND SIMULATION

Jewelry boxes and other decorative items are often cut from tiger's eye and polished to bring out its shimmer (cat's eye effect). Quartz cat's eye is used in jewelry; it is given a rounded shape. They can be distinguished from the chrysoberyl cat's eye by their refractive index.

AVENTURINE QUARTZ 

Aventurine is a gemstone used in jewelry, including for making beads for necklaces. Aventurine stones are also placed in brooches, earrings and pendants. Aventurine is also used as a sculptural raw material.

CHEMICAL COMPOSITION 

Krzemyonka

PHYSICAL PROPERTIES

The name comes from a term given to a type of glass invented in Italy at the beginning of the XNUMXth century. This glass was received by accident, thank you "Lucky luck" is the Italian word for aventura.. Aventurine quartz (aventurine), reminiscent of this glass, contains mica plates, the presence of which is the cause of its characteristic brilliance. Crystals of pyrite and other minerals can also be fossilized in aventurine quartz.

ENTRY

Good quality aventurine is found mainly in Brazil, India and Siberia. In Poland, aventurine is found sporadically in the Jizera Mountains.

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