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Appearance, Uses and History
Kyanite is an Aluminium Silicate mineral, which often occurs as bladed crystals.
It is primarily used in refractory products and ceramics, as well as electronics, insulators, and abrasives.
Kyanite is prized by collectors for its interesting shapes and bright colours, and it has also been used for a gemstone in the past. High-quality gemmy pieces are sometimes faceted, although it is not ideal for this usage due to its perfect cleavage – it can break easily.
Kyanite is found all around the world, including Antarctica, Argentina, Bulgaria, Canada, Czechia, France, Greece, Italy, Kenya, Norway, Romania, Russia, Spain, Switzerland, the UK, and Zimbabwe.
There are some particularly gemmy specimens found in Australia, Brazil, Nepal, Tanzania, and the USA.
6.5 – 7.0 perpendicular to that axis.
Photos of Kyanite
Hazards and Warnings
Contains Aluminium – however, this is unlikely to be a hazard unless powdered and ingested.
Almost all rocks, minerals (and, frankly, almost all other substances on earth) can produce toxic dust when cutting, which can cause serious respiratory conditions including silicosis.
When cutting or polishing rocks, minerals, shells, etc, all work should be done wet to minimise the dust, and a suitable respirator or extraction system should be used.
Mandarin and Traditional Chinese: