Sanguite
| Sanguite | |
|---|---|
| General | |
| Category | Halides |
| Formula (repeating unit) | KCuCl₃ |
| IMA symbol | Sgu |
| Crystal system | monoclinic |
| Crystal class | 2/m |
| Space group | 2/ m - prismatic |
| Unit cell | V = 481.38 ų |
| Identification | |
| Color | bright red |
| Twinning | polysynthetic twinning has been observed. |
| Cleavage | Perfect |
| Fracture | staggered, step-like |
| Tenacity | fragile |
| Luster | Vitreous |
| Streak | reddish orange |
| Density | 2.86(1) g/cm³ (measured); 2.88 g/cm³ (calculated) |
| Optical properties | biaxial |
| Refractive index | n α = 1.653(3) n β = 1.780(6) n γ = 1.900(8) |
| Birefringence | δ = 0.247 |
| Pleochroism | strong |
| 2V angle | Measured: 85° (5) Calculated: 82° |
| Dispersion | very strong |
| References | [1] |
Sanguite is a halide mineral. It is named after the Latin word sanguis, meaning blood, due to its bright red colouration. It was approved as a valid species by the International Mineralogical Association in 2013.
Characteristics
Sanguite is a chloride with the chemical formula KCuCl3. It crystallizes in the monoclinic system and has a Mohs scale hardness of 3.
Formation and deposition
Sanguite was discovered in the Glavnaya Tenoritovaya fumarole on the Tolbachik Volcano in Kamchatka Krai, Russia, the only place on Earth where it is known to form.[1] There it forms in clusters or crusts as fine prismatic crystals up to 1 mm long and 0.2 mm thick.
References
- ^ a b "Sanguite". Mindat.org. June 23, 2023. Retrieved July 8, 2023.The map of localities is at the bottom of the page, showing it is only known to form on Tolbachik.