Veenit
| Veenit | |
|---|---|
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| General and classification | |
| other names |
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| chemical formula |
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Mineral class (and possibly department) |
Please complete |
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System no. to Strunz and to Dana |
2.HC.05d ( 8th edition : II / D.07) 03.05.09.02 |
| Crystallographic Data | |
| Crystal system | orthorhombic |
| Crystal class ; symbol | orthorhombic-pyramidal; mm 2 or orthorhombic dipyramidal; 2 / m 2 / m 2 / m |
| Space group | Pmcn (No. 62, position 5) |
| Lattice parameters | a = 8.44 Å ; b = 26.2 Å; c = 7.90 Å |
| Formula units | Z = 4 |
| Physical Properties | |
| Mohs hardness | not defined (156 to 172 HV 50) |
| Density (g / cm 3 ) | measured: 5.92; calculated: 5.96 |
| Cleavage | Please complete |
| Break ; Tenacity | clamshell; brittle |
| colour | steel gray |
| Line color | black with a brownish tinge |
| transparency | opaque |
| shine | Metallic luster |
Veenit is a very rarely occurring mineral from the mineral class of " sulfides and sulfosalts " with the chemical composition Pb 4 (As, Sb) 4 S 10 and thus chemically a lead - arsenic / antimony sulfide. The elements arsenic and antimony indicated in the round brackets can represent each other in the formula ( substitution , diadochie), but are always in the same proportion to the other components of the mineral (lead and sulfur ).
Veenit crystallizes in the orthorhombic crystal system and develops mostly massive aggregates up to about two centimeters in size, but rarely also small, isometric prisms of steel-gray color and metallic sheen . He leaves a black line with a brownish tinge on the whiteboard.
Etymology and history
Veenite was first discovered in the "Taylor Pit" ( Taylor pit ) near Huntingdon in Hastings County in the Canadian province of Ontario and described in 1967 by John Leslie Jambor (1936-2008), who named the mineral after the Dutch geologist and metallographer RW van der Veen .
classification
Already in the now outdated 8th edition of the mineral classification according to Strunz , the veenite belonged to the mineral class of "sulfides and sulfosalts" and there to the department "complex sulfides (sulfosalts)", where together with boulangerite , dadsonite , Fülöppit , guettardite , heteromorphite , jamesonite , Launayit , Madocit , Meneghinit , Parajamesonit (discredited 2006), Plagionit , Playfairit , Robinsonit , Semseyit , Sorbyit , Sterryit , Tintinait , Twinnit and Zinkenite the "Jamesonit-Boulangerit group (lead antimony spit splendor)" with the system no. II / D.07 .
In the Lapis mineral directory according to Stefan Weiß, which, out of consideration for private collectors and institutional collections, is still based on this old form of Karl Hugo Strunz's system , the mineral was given the system and mineral number. II / E.18-20 . In the "Lapis system" this corresponds to the section "Sulphosalts (S: As, Sb, Bi = x)", where Veenit only forms an independent but unnamed group together with Dufrénoysite (as of 2018).
The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and was updated by the International Mineralogical Association (IMA) until 2009, classifies the Veenit in the department of “sulfosalts with SnS as a model”. This is further subdivided according to the predominant metals in the compound, so that the mineral, according to its composition, can be found in the sub-section "Only with lead (Pb)", where together with Dufrénoysite, Rathite and Rathite-IV it forms the "Dufrénoysite group" the system no. 2.HC.05d forms.
The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the Veenit to the class of "sulfides and sulfosalts" and there in the department of "sulfosalts". Here it is together with Cosalit and Dufrénoysit in the " Cosalit group " with the system no. 03.05.09 within the subdivision of "sulfosalts with the ratio 2.5 <z / y <3 and the composition (A + ) i (A 2+ ) j [B y C z ], A = metals, B = semi-metals, C = non-metals ”.
Crystal structure
Veenit crystallizes orthorhombically in the space group Pmcn (space group no. 62, position 5) or P 2 1 cn (no. 33, position 4) with the lattice parameters a = 8.44 Å ; b = 26.2 Å and c = 7.90 Å and 4 formula units per unit cell .
Education and Locations
The type material was found in the form of small masses, small veins and grains sprinkled into marble. Accompanying minerals include arsenopyrite , boulangerite , calcite , chalcopyrite , galena , gratonite , pyrite and sphalerite .
So far (as of 2012) less than 10 locations for Veenit are known. In addition to its type locality "Taylor Pit" ( Taylor pit ) near Huntingdon, the mineral has so far only appeared in Canada in the "Mattabi Mine" in the Kenora District .
Other well-known sites are the “Carma Mine” in the Antonio Quijarro province in Bolivia, the “Plaka Mine No. 80 ”near Lavrio (Attica) in Greece, the“ Guitarra Mine ”near Temascaltepec in Mexico, Huachocolpa in the Peruvian region of Huancavelica and the“ Herja Mine ”near Chiuzbaia in the Romanian district of Maramureș . Another find in the "Grube Hope" (Grube Spes) at Martinsknipp near Ahrbrück in Rhineland-Palatinate has not yet been confirmed.
See also
literature
- John Leslie Jambor : New lead sulfantimonides from Madoc, Ontario. Part 1 . In: The Canadian Mineralogist . tape 9 , no. 1 , 1967, p. 7-24 .
- Friedrich Klockmann : Klockmann's textbook of mineralogy . Ed .: Paul Ramdohr , Hugo Strunz . 16th edition. Enke, Stuttgart 1978, ISBN 3-432-82986-8 , pp. 478 (first edition: 1891).
Web links
- Mineral Atlas: Veenit (Wiki)
- David Barthelmy: Veenite Mineral Data. In: webmineral.com. Retrieved October 18, 2019 .
Individual evidence
- ↑ a b c d e Hugo Strunz , Ernest H. Nickel : Strunz Mineralogical Tables. Chemical-structural Mineral Classification System . 9th edition. E. Schweizerbart'sche Verlagbuchhandlung (Nägele and Obermiller), Stuttgart 2001, ISBN 3-510-65188-X , p. 134 (English).
- ↑ Hans Jürgen Rösler : Textbook of Mineralogy . 4th revised and expanded edition. German publishing house for basic industry (VEB), Leipzig 1987, ISBN 3-342-00288-3 , p. 353 .
- ↑ a b Veenite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 ( handbookofmineralogy.org [PDF; 61 kB ; accessed on June 14, 2018]).
- ↑ Michael Fleischer : New Mineral Names . In: The American Mineralogist . tape 53 , 1968, pp. 1421–1427 ( minsocam.org [PDF; 493 kB ; accessed on June 14, 2018]).
- ↑ Stefan Weiß: The large Lapis mineral directory. All minerals from A - Z and their properties. Status 03/2018 . 7th, completely revised and supplemented edition. Weise, Munich 2018, ISBN 978-3-921656-83-9 .
- ↑ Ernest H. Nickel, Monte C. Nichols: IMA / CNMNC List of Minerals 2009. (PDF 1703 kB) In: cnmnc.main.jp. IMA / CNMNC, January 2009, accessed October 18, 2019 .
- ↑ a b Veenite. In: mindat.org. Hudson Institute of Mineralogy, accessed October 18, 2019 .