Nežilovit
| Nežilovit | |
|---|---|
 |
|
| General and classification | |
| other names |
IMA 1994-020 |
| chemical formula |
|
|
Mineral class (and possibly department) |
Oxides and hydroxides |
|
System no. to Strunz and to Dana |
4.CC.45 ( 8th edition : IV / C.08) 04/07/02/03 |
| Crystallographic Data | |
| Crystal system | hexagonal |
| Crystal class ; symbol | dihexagonal-dipyramidal; 6 / m 2 / m 2 / m |
| Room group (no.) | P 6 3 / mmc (No. 194) |
| Lattice parameters | a = 5.85 Å ; c = 22.88 Å |
| Formula units | Z = 2 |
| Physical Properties | |
| Mohs hardness | 4 to 5 |
| Density (g / cm 3 ) | calculated: 5.69 |
| Cleavage | completely after {001} |
| Break ; Tenacity | clamshell; brittle |
| colour | black |
| Line color | dark brown |
| transparency | opaque |
| shine | Metallic luster |
| magnetism | magnetic |
Nežilovit is a very rarely occurring mineral from the mineral class of "oxides and hydroxides". It crystallizes in the hexagonal crystal system with the idealized chemical composition PbZn 2 Mn 4+ 2 Fe 3+ 8 O 19 , so it is a lead - zinc - manganese - iron - oxide .
Since part of the manganese in naturally formed Nežilovites can be replaced ( substituted ) by titanium 4+ ions , the formula is occasionally also given as PbZn 2 (Mn 4+ , Ti 4+ ) 2 Fe 3+ 8 O 19 , where the The elements indicated in the round brackets can represent each other in the formula, but are always in the same proportion to the other components of the mineral.
Nežilovit is opaque black and develops hexagonal, tabular crystals up to about one millimeter in size with a metallic sheen on the surfaces.
Etymology and history
Nežilovit was first discovered on the Kalugeri in the Babuna Valley (Jakupica Mountains) near Nežilovo in the Macedonian municipality of Veles and described in 1996 by Vladimir Bermanec, Dan Holtstam, Darko Sturman, Alan J. Criddle, Malcolm E. Back, Stjepan, Šćavničar, who named the mineral after the nearby place of its type locality .
In older publications, the mineral name is occasionally found in the spelling Nezilovit without Hatschek , which, however, neither corresponds to the naming in the original description nor to the specifications for mineral naming of the International Mineralogical Association (IMA), according to which, for example, minerals that were named after a geographical location are on it it must be ensured that the spelling of the name corresponds to that of the type locality. The inconsistent spelling of their names for many minerals was corrected with the publication "Tidying up Mineral Names: an IMA-CNMNC Scheme for Suffixes, Hyphens and Diacritical marks" in 2008.
classification
Already in the outdated, but partly still in use 8th edition of the mineral classification according to Strunz , the Nežilovit belonged to the mineral class of "oxides and hydroxides" and there to the division of "oxides with a metal: oxygen ratio = 2: 3 (M 2 O 3 and related compounds) ", where he together with Bartelkeit , Batiferrit , Haggertyit , Hawthorneit , Hibonit , Lindqvistit , magnetoplumbite , Otjisumeit , Plumboferrit , Yimengit and Zenzénit the" Magnetoplumbitgruppe "with the system number. IV / C.08 .
The 9th edition of Strunz's mineral systematics, which has been in effect since 2001 and is used by the IMA, classifies Nežilovit in the category of “Oxides with a metal: oxygen ratio of 2: 3, 3: 5 and comparable”. This is further subdivided according to the relative size of the cations involved , so that the mineral can be found according to its composition in the sub-section “With large and medium-sized cations”, where it can be found together with batiferite, barioferrite , diaoyudaoite , haggertyite, hawthornite , hibonite, lindqvistite , Magnetoplumbit, Plumboferrit and Yimengit the "Magnetoplumbitgruppe" with the system no. 4.CC.45 forms.
The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns Nežilovit to the class of "oxides and hydroxides" and there in the department of "multiple oxides". Here it can be found together with magnetoplumbite, haggertyite and batiferite in the unnamed group 04/07/02 (hexagonal, P6 3 / mmc), strongly magnetic within the sub-section “ Multiple oxides with O 19 groups ”.
Education and Locations
Nežilovit formed in Precambrian metamorphic complex, where he rose in dolomite - marble was found. Various chlorites and plagioclase , barite , braunite , cymrite , franklinite , gahnite , hematite , hedyphan , phlogopite , piemontite and talc occur as accompanying minerals .
In addition to its type locality, the Kalugeri hill, the mineral has so far (as of 2014) only been found in a nearby, mixed series formation in the Babuna Valley in the Jakupica Mountains in Macedonia.
Crystal structure
Nežilovit crystallizes hexagonally in the space group P 6 3 / mmc (space group no. 194) with the lattice parameters a = 5.85 Å and c = 22.88 Å as well as two formula units per unit cell .
See also
literature
Vladimir Bermanec, Dan Holtstam, Darko Sturman, Alan J. Criddle, Malcolm E. Back, Stjepan, Šćavničar: Nežilovite, a new member of the magnetoplumbite group, and the crystal chemistry of magnetoplumbite and hibonite. In: The Canadian Mineralogist. Volume 34 (1996), pp. 1287–1297 ( PDF 956.8 kB )
Web links
Individual evidence
- ↑ a b IMA / CNMNC List of Mineral Names; October 2013 (PDF 1.5 MB)
- ↑ a b c d e Hugo Strunz , Ernest H. Nickel: Strunz Mineralogical Tables . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 202 .
- ↑ Mineral Atlas: Nežilovit
- ↑ a b Webmineral - Nežilovite
- ^ Ernest H. Nickel , Joel D. Grice: The IMA Commission on New Minerals and Minerala Names: Procedures and Guidelines on Mineral Nomenclature , In: The Canadian Mineralogist , Volume 36 (1998); PDF 328 kB , from p. 8
- ^ Ernst AJ Burke: Tidying up Mineral Names: an IMA-CNMNC Scheme for Suffixes, Hyphens and Diacritical marks , In: Mineralogical Record , Volume 39, No. 2 (March – April 2008); PDF 2.7 MB
- ↑ Find location list for Nežilovit in the Mineralienatlas and in Mindat