Pyrophyllite
| About Pyrophyllite | |
|---|---|
| Formula: | Al2Si4O10(OH)2 |
| As a Commodity: | Pyrophyllite |
| Colour: | White, gray, pale blue, pale green, pale yellow, brownish green |
| Lustre: | Pearly, Dull |
| Hardness: | 1 - 2 |
| Specific Gravity: | 2.65 - 2.9 |
| Crystal System: | Triclinic |
| Member of: | Pyrophyllite-Talc Group |
| Physical Properties of Pyrophyllite | |
| Lustre: | Pearly, Dull |
| Transparency: | Translucent, Opaque |
| Colour: | White, gray, pale blue, pale green, pale yellow, brownish green |
| Hardness: | 1 - 2 on Mohs scale |
| Tenacity: | Flexible |
| Cleavage: | Perfect on {001} |
| Comment: | inelastic |
| Density: | 2.65 - 2.9 g/cm3 (Measured) 2.81 g/cm3 (Calculated) |
| Optical Data of Pyrophyllite | |
| Type: | Biaxial (-) |
| RI values: | nα = 1.534 - 1.556 nβ = 1.586 - 1.589 nγ = 1.596 - 1.601 |
| 2V: | Measured: 53° to 62°, Calculated: 46° to 60° |
| Max Birefringence: | δ = 0.062( Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.) |
| Surface Relief: | Moderate |
| Dispersion: | r > v weak |
| Chemical Properties of Pyrophyllite | |
| Formula: | Al2Si4O10(OH)2 |
| Elements listed: | Al, H, O, Si - search for minerals with similar chemistry |
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