1 / 56
Kyanite crystals on matrix
- ProveniențăLocality
- Lotru Mts., Romania
- DimensiuniSize
- 15 x 9.5 x 6.5 cm
- FormulăFormula
- Al2(SiO4)O
- Nr. de inventarInventory no.
- 20246
Kyanite is a mineral found mainly in metamorphic rocks. Kyanite specimens have a variable hardness. The long crystals have a Mohs hardness of about 4.5 to 5 if tested parallel to the length of a crystal, and a hardness of 6.5 to 7 if tested across the short dimension of a crystal. The mineral was once commonly called 'disthene' which means 'two strengths'. It sometimes exhibits intense shades of blue, or even multiple shades with color zoning in a single crystal.