දඹ පළිඟු
දඹ පළිඟු | |
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ගොනුව:දඹ පළිඟු. Magaliesburg, South Africa.jpg | |
General | |
Category | Mineral variety |
රසායනික සූත්රය | සිලිකා (silicon dioxide, SiO2) |
Identification | |
පාට / පැහැය | දම් පාට |
Crystal habit | 6-sided prism ending in 6-sided pyramid (typical) |
Crystal system | rhombohedral class 32 |
Twinning | Dauphine law, Brazil law, and Japan law |
Cleavage | නැත |
Fracture | Conchoidal |
Mohs scale hardness | 7–lower in impure varieties |
Luster | Vitreous/glossy |
Streak | සුදු |
Diaphaneity | Transparent to translucent |
Specific gravity | 2.65 constant; variable in impure varieties |
Optical properties | Uniaxial (+) |
Refractive index | nω = 1.543–1.553 nε = 1.552–1.554 |
Birefringence | +0.009 (B-G interval) |
Pleochroism | නැත |
Melting point | 1650±75 °C |
Solubility | insoluble in common solvents |
Other characteristics | Piezoelectric |