Kutnohorite
- Kutnahorit
- Manga dolomite
Kutnohorit, also known as Kutnahorit or manganese dolomite is a mineral from the mineral class of " carbonates ( and relatives ) ," which can be abundant in various localities in part, but overall is not widespread. It crystallizes in the trigonal crystal system with the composition CaMn [ CO3 ] 2, and is therefore chemically seen a calcium manganese carbonate.
Kutnohorit developed mainly polycrystalline, radial-, granular or massive mineral aggregates of white, gray, pink, pale yellow in color with white stroke color.
Kutnohorit forms with dolomite and ankerite in each case a complete solid solution series.
Special Features
Under UV light, show some Kutnohorite an orange to pink fluorescence, similar to that of neon-colored highlighters.
Etymology and history
Was first found in the Kutnahorit " Poličany " near Kutná Hora in the Czech region of Central Bohemia and described in 1901 by Antonín Bukovský ( 1865-1950 ), who named the mineral after the type locality.
Classification
In the now outdated but still in use 8th edition of the mineral classification by Strunz the Kutnohorit " water outdoors carbonates without foreign anions " belonged to the common mineral class of " carbonates, nitrates and borates " and then to the Department of where he, along with ankerite, Benstonit dolomite, Ewaldit, huntite, Minrecordit and Norsethit formed a distinct group.
The 9th edition used since 2001 and valid by the International Mineralogical Association (IMA ) of the Strunz'schen Mineral classification assigns the Kutnohorit in the class of " carbonates and Nitrage " ( borates now form a separate class ) and then in the Department of " carbonates without further anions, without H2O ". This division, however, is further subdivided according to the group membership of the cations involved, so that the mineral " alkaline-earth (and other M2 ) carbonates " can be found according to its composition in the subdivision where it only together with ankerite, dolomite and Minrecordit the " dolomite group "with the system no. 5.AB.10 forms.
The classification of minerals according to Dana assigns the Kutnohorit as the outdated Strunz'sche systematics in the common class of " carbonates, nitrates and borates " and there in the department of " water clear carbonates ". Here he is with dolomite, ankerite and Minrecordit in the " dolomite group ( Trigonal: R3) " with the system no. 14:02:01 within the sub-division of " water clear 2 carbonates having the formula A B2 ( CO3) " to find.
Education and Locations
Kutnohorit forms hydrothermal or metamorphic in various deposits mostly in paragenesis with Rhodochrosite, aragonite and calcite, but also with ankerite, quartz, or other minerals.
Worldwide, Kutnohorit so far (as of 2011) are detected at around 150 localities. Apart from its type locality Kutná Hora in the Czech Republic there is the mineral even at Lomnice u Sokolova and Chvaletice.
In Germany, the mineral found so far on the hard Koppe in the Spessart in Bavaria; in an ore mine reason ( pit "Help of God") and in the pit Bülten - Adenstedt ( Emilie shaft ) in Lower Saxony; at Elbingerode in Saxony -Anhalt as well as in the district of Freiberg in Saxony.
In Austria Kutnohorit St. Leonhard joined hut and Bad in the Lavant valley in Carinthia, Salzburg in the Tennen Mountains, at glassworks in the village of Gressenberg and in Veitschtal in Styria on.
In Switzerland so far could the mineral in the Albula, in the Upper Rhine Valley and in the community Bregaglia in the canton of Graubünden and in Turtmanntal found in the canton of Valais.
Other localities are Argentina, Australia, Belgium, Brazil, Bulgaria, Chile, China, France, Gabon, Ghana, India, Indonesia, Italy, Japan, Canada, Kazakhstan, Mexico, Namibia, New Zealand, Norway, Peru, Poland, Romania, Russia, Sweden, Slovakia, South Africa, Turkey, Ukraine, Hungary and the United States of America (USA).
Crystal structure
Kutnohorit trigonal crystallized in the space group R3 ( Raumgruppen-Nr. 148) with the lattice parameters a = 4.85 Å and c = 16.22 Å and three formula units per unit cell.