Kobellite
Kobellite is a lead that is rare bismuth antimony sulfide mineral that contains over 40% bismuth. The formula of this stone is Pb22Cu4Bi25Sb5S69. It is opaque with a metallic lustre and colour that is steel-grey. It really is rarely available as being a treasure that is faceted will attract with its bright metallic lustre contrasted by the Quartz host material.
Distribution: In Sweden, through the Vena mines, near Askersund, Örebro (type locality), and also at Boliden, Västerbotten. From the Srednegolgotaiskoe gold deposit, Transbaikalia, Siberia, Russia. In the Ustarasai bismuth deposit, near Brichmulla village, Pskem Range, south Tien Shan, northeastern Uzbekistan. At the Salsigne mine, 15 north that is kilometre of, Aude, France. Within the Aljustrel deposit, Portugal. From Smolotely, near Príbram, Czech Republic. At St. Andreasberg, Harz Mountains, Germany. From Ciclova, Romania. At Zeehan, Tasmania, Australia. Into the USA, through the rock that is superior, Raleigh, Wake County, new york; within the Cofer deposit, near Mineral, Louisa County, Virginia; at the Silver Bell mine, Red Mountain region, Ouray County, Colorado. In Canada, from the Deer Park mine, in the Rossland area, and in the Dodger tungsten mine, Salmo, British Columbia; during the Tintina silver mines, Watson Lake, Yukon Territory.
| Category: | Sulfide minerals |
| Chemical Formula: | Pb22Cu4Bi25Sb5S69 |
| Lead Copper Bismuth Antimony Sulfide | |
| Molecular Weight: | 12858.40 gm |
| Composition: | Copper | 1.98 % | Cu | ||||
| Bismuth | 40.63 % | Bi | |||||
| Antimony | 4.73 % | Sb | |||||
| Lead | 35.45 % | Pb | |||||
| Sulfur | 17.21 % | S |
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| Crystallography: | Orthorhombic – Dipyramidal | ||||||
| Crystal Habit: | Bladed, to 2 mm; commonly fibrous, massive, granular. | ||||||
| Twinning: | None | ||||||
| Cleavage: | Good on {010} |
| Fracture: | Commonly fibrous |
| Tenacity: | Brittle |
| Moh’s Hardness: | 2.5 – 3.0 |
| Density: | 6.48 (g/cm3) |
| Luminescence: | None |
| Radioactivity: | Not Radioactive |
| Color: | Blackish lead-Gray to steel-Gray; in polished section: White |
| Transparency: | Opaque |
| Luster: | Metallic |
| Refractive Index: | R1–R2: (400) 48.6–51.8, (420) 48.0–51.1, (440) 47.5–50.5, (460) 47.0–49.9, (480) 46.6–49.3, (500) 46.1–48.7, (520) 45.6–48.1, (540) 45.0–47.5, (560) 44.6–46.9, (580) 44.1–46.4, (600) 43.8–45.9, (620) 43.5–45.7, (640) 43.3–45.5, (660) 43.1–45.4, (680) 42.9–45.3, (700) 42.7–45.2 |
| Birefringence: | 0.00 |
| Dispersion: | n/a |
| Pleochroism: | Weak |
| Anisotrophism: | Distinct; Color in reflected light: white |
