Miassite
| Miassite | |
|---|---|
 |
|
| General and classification | |
| other names |
|
| chemical formula | Rh 17 S 15 |
|
Mineral class (and possibly department) |
Sulfides and sulfosalts |
|
System no. to Strunz and to Dana |
2.BC.05 ( 8th edition : II / B.16) 02.16.19.02 |
| Crystallographic Data | |
| Crystal system | cubic |
| Crystal class ; symbol | cubic hexakisoctahedral; 4 / m 3 2 / m |
| Space group | Pm 3 m (No. 221) |
| Lattice parameters | a = 9.91 Å |
| Formula units | Z = 2 |
| Physical Properties | |
| Mohs hardness | 5 to 6 |
| Density (g / cm 3 ) | calculated: 7.42 |
| Cleavage | Please complete |
| colour | Gray |
| Line color | Please complete |
| transparency | opaque |
| shine | Metallic luster |
Miassite (also prassoite ) is a very rarely occurring mineral from the mineral class of " sulfides and sulfosalts " with the chemical composition Rh 17 S 15 and is therefore chemically a rhodium sulfide . It crystallizes in the cubic crystal system .
Miassite has so far only been found in the form of opaque and rounded grains of about 70 × 100 μm of gray color.
Etymology and history
Miassit was first discovered in 1981 on the Miass River near Tscheljabinsk ( Chelyabinsk in English ) in the southern Urals in Russia and described by S. N. Britvin, N. S. Rudashevsky, A. N. Bogdanova and D. K. Shcherbachev, who named the mineral after its type locality and who provided their mineral description in 1997 to test for independence submitted to the International Mineralogical Association (IMA / CNMNC) (register no. IMA 1997-029). The mineral and the chosen name were recognized in the same year. The first description was published in 2001.
Britvin et al. noted however during their investigations that the same substance had already been submitted to the IMA / CNMNC for testing under the name Prassoit in 1970 (register no .: IMA 1970-041), but assumed in their application that the mineral was not recognized has been. In fact, according to a written comment from LJ Cabri in 2002, the first application for Prassoit was approved in April 1971. The analysis results and the recognized name were probably never published, so the name Prassoit was discredited in 2003 in favor of the name Miassit.
classification
Since the miassite was only recognized as an independent mineral in 1997, it is not yet listed in the 8th edition of the Strunz mineral classification, which has been outdated since 1977 . Only in the Lapis mineral directory , which was revised and updated in 2018 by Stefan Weiß, which is still based on this classic system from Karl Hugo Strunz out of consideration for private collectors and institutional collections , the mineral received the system and mineral number. II / B.16-80 . In the "lapis system" this corresponds to the class of "sulfides and sulfosalts" and there the section "sulfides with the molar ratio metal: S, Se, Te> 1: 1", where miassite together with argentopentlandite , geffroyite , cobalt pentlandite , manganese hadlunite , Palladite , pentlandite and shadlunite form the "pentlandite group".
The 9th edition of Strunz's mineral systematics, valid since 2001 and updated by the IMA / CNMNC until 2009, also assigns the miassite to the division of "Metal sulfides, M: S> 1: 1 (mainly 2: 1)". This is, however, further subdivided according to the predominant metals in the compound, so that the mineral, according to its composition, can be found in the subsection "with rhodium (Rh), palladium (Pd), platinum (Pt), etc." where it is only together with Palladseit forms the unnamed group 2.BC.05 .
Also the systematics of minerals according to Dana , which is mainly used in the English-speaking area , assigns the miassite to the class of "sulfides and sulfosalts" and there in the department of "sulfide minerals". Here he is together with Palladseit in the " Palladseitgruppe " with the system no. 02.16.19 within the subsection "Sulphides - including selenides and tellurides - with various formulas".
Crystal structure
Miassite crystallizes cubically in the space group Pm 3 m (space group no. 221) with the lattice parameter a = 9.91 Å and two formula units per unit cell .
Education and Locations
Miassit was found as inclusion (inclusion) in Isoferroplatin in a heavy mineral concentrate together with Cuprorhodsit , Bowieit , Vasilit , cooperite and Keithconnit .
As a very rare mineral formation, Miassite has so far (as of 2011) only been detected at a few sites, eight of which are known. In addition to its type locality Miass in the southern Urals, the mineral also occurred in Russia in the Uktus complex in the central Urals.
Other sites are the "Thetford Mines" in the Chaudière-Appalaches region in Canada, the "Tiébaghi Cr Mine" in the Tiébaghi massif near the municipality of Koumac in New Caledonia, at Freetown in Sierra Leone, in the Bushveld complex and at the Maandagshoek Farm in South Africa and at Platinum Creek in the Bethel Census Area in the US state of Alaska.
See also
literature
- С. Н. Бритвин, Н. С. Рудашевский, А. Н. Богданова, Д. К. Щербачев: Миассит Rh 17 S 15 - Новый Минерал из Россыпи реки миасс (Урал) . In: Zapiski Vserossijskogo Mineralogicheskogo Obshchestva . tape 130 , no. 2 , 2001, p. 41–45 (Russian, rruff.info [PDF; 300 kB ; accessed on November 16, 2019] English transcription: SN Britvin, NS Rudashevsky, AN Bogdanova, DK Shcherbachev: Miassite Rh 17 S 15 , a new mineral from a placier of Miass River, Urals ).
- Igor V Pekov: New minerals from former Soviet Union countries, 1998-2006: New minerals approved by the IMA commission on new minerals and mineral names . In: Mineralogical Almanac . tape 11 , 2007, p. 35 (English, rruff.info [PDF; 3.9 MB ; accessed on February 11, 2019]).
Web links
- Mineral Atlas: Miassite (Wiki)
- Miassite search results. In: rruff.info. Database of Raman spectroscopy, X-ray diffraction and chemistry of minerals (RRUFF), accessed on November 16, 2019 .
Individual evidence
- ↑ Malcolm Back, William D. Birch, Michel Blondieau and others: The New IMA List of Minerals - A Work in Progress - Updated: September 2019. (PDF 2672 kB) In: cnmnc.main.jp. IMA / CNMNC, Marco Pasero, September 2019, accessed November 16, 2019 .
- ↑ 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. 70 (English, as prassoite).
- ↑ David Barthelmy: Miassite MineralData. In: webmineral.com. Retrieved November 16, 2019 .
- ↑ a b c Miassite. In: mindat.org. Hudson Institute of Mineralogy, accessed November 16, 2019 .
- ↑ С. Н. Бритвин, Н. С. Рудашевский, А. Н. Богданова, Д. К. Щербачев: Миассит Rh 17 S 15 - Новый Минерал из Россыпи реки миасс (Урал) . In: Zapiski Vserossijskogo Mineralogicheskogo Obshchestva . tape 130 , no. 2 , 2001, p. 41–45 (Russian, rruff.info [PDF; 300 kB ; accessed on November 16, 2019] English transcription: SN Britvin, NS Rudashevsky, AN Bogdanova, DK Shcherbachev: Miassite Rh 17 S 15 , a new mineral from a placier of Miass River, Urals ).
- ↑ John L. Jambor, Edward S. Grew, Andrew C. Roberts: New Mineral Names . In: American Mineralogist . tape 87 , 2002, pp. 1509–1513 ( rruff.info [PDF; 77 kB ; accessed on November 16, 2019] Miassite p. 1511).
- ↑ David Barthelmy: Prassoite MineralData. In: webmineral.com. Retrieved November 16, 2019 .
- ↑ 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 November 16, 2019 .