Willemite
| Refractive Index : 1.719 – 1.691 |
| Optical Characteristic : DR, Uniaxial positive |
| Specific Gravity : 4.10 (+ 0.10 – 0.10) |
| Formula : Zn2SiO4 |
| Crystal System : Trigonal |
| Variety/Species : All |
| Species/Group : Williemite |
| Birefringence : 0.028 |
| Dispersion : N/A |
| Hardness : 5.5 |
| Toughness : Poor |
| Ultrasonic : Never |
| Steam : Never |
| UV Long : Moderate to strong |
| UV Short : Moderate to strong |
| Pleochroism : 2 colors |
| Strength : Weak to moderate |
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| Pleochroism Colors : No data |
| Heat : Sensitive |
| Acids : Attacked by acids and/or chemicals |
| Light : Stable |
| Polish Luster : Resinuous |
| Fracture : Conchoidal to uneven |
| Fracture Luster : Resinous |
| Clarity Type : N/A |
| Tones : N/A |
| Saturations : N/A |
| Cause of Color : Unknown |
| Enhancements : None |
| Cleavage : Poor |
| Color Range : Red, orangy red, reddish orange, orangy yellow, orange, yellow, brown, colorless, white, gray, green |
| Transparency : Transparent to opaque |
| Phenomena : Chatoyancy, aventurescence |
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| Separations : Willemite from- |
| Identifying Characteristics and information Green phosphorescence(common) |
| Spectral Data Weak bands at 5830,5400,4900,4420 and 4320. Strong band at 4210 |
| Trade Names and Misnomers Troostite Willemite |
Tags: Trigonal, Troostite, Williemite
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