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Contact SupplierProperty | Description |
---|---|
Color | Clear (in pure form) |
Crystal habit | 6-sided prism ending in 6-sided pyramid (typical) |
Crystal system | Trigonal |
Cleavage | None |
Fracture | Conchoidal |
Mohs scale hardness | 7 - lower in impure varieties |
Luster | Vitreous |
Refractive index | 1.544-1.553 - Dr +0.009 (B-G interval) |
Streak | White |
Specific gravity | 2.65 constant; variable in impure varieties |
Melting point | 1650 (±75)oC |
Boiling point | 2230 |
Solubility | H2O insoluble |
Analyte | SSW | Semi | General |
---|---|---|---|
SiO2 | 99.80% (± 00.20%) | 98.30% (± 00.20%) | 96.50% (± 00.30%) |
Al2O3 | 00.03% (± 00.05%) | 00.50% (± 00.10%) | 00.80% (± 00.10%) |
Fe2O3 | 00.05% (max) | 00.085% (max) | 00.20% (max) |
K2O | 25 ppm (max) | 00.001% (max) | 00.20% (± 00.05%) |
Na2O | 40 ppm (max) | 00.001% (max) | 00.09% (max) |
TiO2 | Nil | Traces | Traces |
LOI @ 1000oC | 00.05% | 00.10% | 00.10% |