Batu kecubung termasuk dalam keluarga Quartz (silikon dioksida) dan memiliki berbagai nuansa warna dari ungu hingga kebiruan.
untuk daerah penyebarannya Minas Gerais di Brazil, South Korea., Russia dekat dari Mursinka dan yang terbesar ada di Africa memproduksi 1000 ton. kabar nya indonesia juga memproduksi batu kecubung , terdapat di pulau kalimantan
dari wiki .
| Amethyst | |
|---|---|
Amethyst cluster from Magaliesburg, South Africa.
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|
| General | |
| Category | Mineral variety |
| Formula (repeating unit) |
Silica (silicon dioxide, SiO2) |
| Identification | |
| Color | Purple, violet |
| 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 | None |
| Fracture | Conchoidal |
| Mohs scale hardness | 7–lower in impure varieties |
| Luster | Vitreous/glossy |
| Streak | White |
| 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 | None |
| Melting point | 1650±75 °C |
| Solubility | insoluble in common solvents |
| Other characteristics | Piezoele |
pic kecubung kalimantan
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