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Kyanite crystal Blue ~2-3cms Brazil (carded)

Kyanite crystal Blue ~2-3cms Brazil (carded)

Ref: 23-797

The aluminium SILICATE mineral, Kyanite (derived from the Greek 'kyanos' meaning 'blue') is used in the manufacture of spark plugs, porcelain and other refractories; it has the same chemical composition as ANDALUSITE and SILLIMANITE. It's long-bladed - (usually blue; like this one from Brazil) crystals (triclinic system) are distinctive. Hardness is 4-5 along the length of the crystal and 6-7 across it, lustre is vitreous to pearly, specific gravity is 3.5-3.7 and cleavage is perfect in one direction.
Kyanite occurs in gneisses, schists and granite pegmatites: it is an indicator of deep-seated, regional metamorphism of clay-rich sediments and it often occurs with Garnet and Staurolite in crystalline schists.

Price per crystal

(1 item) 1.23 (1.48 Inc. VAT) view the price in UK Poundsview the price in eurosview the price in US Dollars
(2 to 9) 1.23 (1.48 Inc. VAT) view the price in UK Poundsview the price in eurosview the price in US Dollars
(10+) 0.98 (1.18 Inc. VAT) view the price in UK Poundsview the price in eurosview the price in US Dollars

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