Kyanite
| Refractive Index : 1.731 – 1.716 (+0.004 – 0.004) |
| Optical Characteristic : DR B- |
| Specific Gravity : 3.68 (+0.01 – 0.12) |
| Formula : AI2SiO5=Ai[6]AI[6]OSiO4 |
| Crystal System : Triclinic |
| Variety/Species : All |
| Species/Group : Kyanite |
| Birefringence : 0.012 to 0.017 |
| Dispersion : 0.020 |
| Hardness : 4 to 7.5 |
| Toughness : Poor |
| Ultrasonic : Never |
| Steam : Never |
| UV Long : Weak |
| UV Short : Inert |
| Pleochroism : 3 colors |
| Strength : Moderate to strong |
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| Pleochroism Colors : Moderate to strong: Violet blue/ colorless/ dark blue. |
| Heat : Sensitive |
| Acids : No reaction |
| Light : Stable |
| Polish Luster : Vitreous |
| Fracture : Uneven |
| Fracture Luster : Vitreous to pearly |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : Blue: iron and titanium: green: vanadium |
| Enhancements : None |
| Cleavage : Perfect 1 direction |
| Color Range : Most often light to dark, blue, green, greenish blue, blue-green, bluish, greenish. Can be yellow, gray, brown, colorless Yellowish, grayish, brownish |
| Transparency : Transparent to Translucent |
| Phenomena : Chatoyancy (rare) |
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| Separations : Natural Kyanite from- Epidote : color, plechroism, spectrum, cleavage Idocrase : birefrigence, optic character, spectrum, cleavage, SG, color (possibly) Sapphire : RI, optic character, SG, spectrum, magnification Tanzanite : color, RI, spectrum, SG Spinel : Optic character, magnification, spectrum, birefringence |
| Identifying Characteristics and information Often color zoned in bands of blue, green, and colorless. May fluoresce a weak red (LW). May appear fibrous. Hardness is 4 to 5 in one direction but changes to 6 to 7.5 at a 90 degree angle. Green-white phosphorescence. Kyanite is trimorphous with Sillimanite and Andalusite. |
| Spectral Data Bands at 4350 and 4450. |
| Trade Names and Misnomers Blue Talc (M) Cyanite Disthene Kyanite |
Tags: cyanite, disthene, kyanite
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