Kutnohorite
Kutnohorite, additionally spelt Kutnahorite, is a rare mineral that is a carbonate. This is a known person in the Dolomite Group and is difficult to distinguish from Dolomite except that Kutnohorite has greater density. The Chemical Formula of Kutnohorite is Calcium Magnesium Carbonate (Ca(Mn, Mg, Fe)(CO3)2) and its molecular weight is 205.94 gm. When coming to the Crystal habit, In polycrystalline spherules, to 2 cm, aggregates, and cleavages. A specific gravity of Kutnohorite is 1.535 – 1.727 Uniaxial ( – ) and its Moh’s Hardness is 3.5 – 4.0.
The analyzed material, shown to have the dolomite structure type, occurs at Kutná Hora and Chvaletice, Czech Republic. At Långban, Värmland, Sweden. From near Levane, Tuscany, Italy. In the USA, at Franklin and Sterling Hill, Ogdensburg, Sussex Co., NJ-new jersey; in the Sunnyside and Silver King mines, Silverton district, San Juan Co., Colorado; into the Longvale quarry, Laytonville, Mendocino Co., California; from Bald Knob, Alleghany Co., North Carolina. At Mont Saint-Hilaire, Quebec, Canada. In the Providencia district, Zacatecas, Mexico. Fine examples from the N’Chwaning mine, near Kuruman, South Africa. In Japan, in the Hoei tin mine, Oita Prefecture, from the Chichibu mine, Saitama Prefecture, and at the Ryujima mine, 15 km southwest of Matsumoto, Nagano Prefecture. From Broken Hill, Brand New South Wales, Australia.
| Category: | Carbonate mineral | |||||||||||||||||||||||||||||||||||
| Chemical Formula: | Ca(Mn,Mg,Fe)(CO3)2 | |||||||||||||||||||||||||||||||||||
| Calcium Magnesium Carbonate | ||||||||||||||||||||||||||||||||||||
| Molecular Weight: | 205.94 gm | |||||||||||||||||||||||||||||||||||
| Composition: |
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| Crystallography: | Trigonal – Rhombohedral |
| Crystal Habit: | In polycrystalline spherules, to 2 cm, aggregates, and cleavages. |
| Twinning: | None |
| Cleavage: | [1011] Perfect, [1011] Perfect, [1011] Perfect |
| Fracture: | Sub-Conchoidal |
| Tenacity: | Brittle |
| Moh’s Hardness: | 3.5 – 4.0 |
| Density: | 3.12 (g/cm3) |
| Luminescence: | None |
| Radioactivity: | Not Radioactive |
| Color: | White, pale Rose to bright Pink, light to medium Brown |
| Transparency: | Translucent |
| Luster: | Vitreous to Pearly, Dull |
| Refractive Index: | 1.535 – 1.727 Uniaxial ( – ) |
| Birefringence: | 0.1910 – 0.1920 |
| Pleochroism: | None |
