mineral
Green Kyanite
Kyanite (Al2SiO5)
Hardness: 4.5 to 7 on Mohs scale (anisotropic); Color: Light to dark green; Luster: Vitreous to pearly; Crystal System: Triclinic; Cleavage: Perfect; Specific Gravity: 3.53 - 3.67.
- Hardness
- 4
- Color
- Light to dark green
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 4.5 to 7 on Mohs scale (anisotropic); Color: Light to dark green; Luster: Vitreous to pearly; Crystal System: Triclinic; Cleavage: Perfect; Specific Gravity: 3.53 - 3.67.
Formation & geological history
Formed during high-pressure regional metamorphism of clay-rich sedimentary rocks. It is a polymorph with andalusite and sillimanite, typically appearing in schists and gneisses.
Uses & applications
Used in the manufacture of high-heat refractories (bricks, mortars, kiln furniture), spark plugs, and as a gemstone for jewelry or metaphysical collecting.
Geological facts
Kyanite is unusual because it has two different hardness ratings depending on the direction of the scratch. Green kyanite gets its color from trace amounts of iron or chromium.
Field identification & locations
Look for bladed crystal habits and varying hardness. Commonly found in Brazil, India, and parts of the United States like North Carolina and Virginia.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral