Maslovit

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Maslovit
General and classification
other names

IMA 1978-002

chemical formula
  • PtBiTe
  • (Pt, Pd) (Bi, Te) 2
Mineral class
(and possibly department) 		Sulfides and sulfosalts
System no. to Strunz
and to Dana 		2.EB.25
02.12.03.12
Crystallographic Data
Crystal system cubic
Crystal class ; symbol cubic-disdodecahedral; 2 / m  3
Space group Pa 3 (No. 205)Template: room group / 205
Lattice parameters a  = 6.687  Å
Formula units Z  = 4
Physical Properties
Mohs hardness 4.5 to 5 ( VHN 20  = 262–388)
Density (g / cm 3 ) calculated: 1.51 to 11.74
Cleavage not defined
colour steel gray, polished surfaces light gray with a purple tinge
Line color not defined
transparency opaque (opaque)
shine Metallic luster

Maslovit is a seldom occurring mineral from the mineral class of " sulfides and sulfosalts " with the chemical composition PtBiTe and thus chemically a platinum - bismuth - telluride . As close relatives of the sulfides, the tellurides are placed in the same class.

Maslovite crystallizes in the cubic crystal system and is mostly found in the form of tiny, elongated to rounded grains up to about 200  µm in size. The ( opaque ) mineral, invisible in every form, shows a metallic sheen on the surfaces of the steel-gray grains . Polished surfaces appear light gray with a purple tinge under the incident light microscope .

Etymology and history

Maslovit was discovered for the first time in the Oktyabr'skoye mine (also Oktyabrsky , Oktyabr'sky or Oktyabr'skoe ), a Cu-Ni sulfide deposit near Talnach ( Talnakh in English ) about 60 km west of Lake Lama in the Putorana Mountains in Siberia ( Russia). It was first described in 1979 by VA Kovalenker, VD Begizov, TL Evstigneeva, NV Troneva and VA Ryabikin, who named the mineral after the Russian geologist Georgi Dmitrijewitsch Maslow (1915–1968), one of the discoverers of the Talnach deposits.

The type material of the mineral is kept in the collection of the Institute of Geology, Petrography, Mineralogy and Geochemistry, as well as in the Fersman Museum of the Russian Academy of Sciences in Moscow.

classification

Since Maslovit was only recognized as an independent mineral in 1978 and this was only published in 1979, it is not yet included in the 8th edition of the Strunz mineral classification, which has been outdated since 1977 . Only 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 , was the mineral given the system and mineral number. II / D.17-160 . 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 maslovite together with aurostibite , cattierite , changchengite , Dzharkenit , Erlichmanit , Fukuchilit , Geversit , Hauerit , Insizwait , Krutaite , Laurit , Mayingit , Michenerit , Padmait , Penroseite , pyrite , Sperrylith , Testibiopalladit , Trogtalit , Vaesit and Villamanínit an independent, but unnamed group / the "pyrite group" with the system no. II / D.15 forms (as of 2018).

The 9th edition of Strunz's mineral systematics, valid since 2001 and updated by the International Mineralogical Association (IMA) until 2009, classifies maslovit in the newly defined section of "Metal sulfides with a substance ratio of M: S ≤ 1: 2". This is further subdivided according to the exact molar ratio and the predominant metals in the compound, so that the mineral can be found in the sub-section "M: S = 1: 2, with Fe, Co, Ni, PGE etc." according to its composition where it together with Changchengit, Cobaltit , Gersdorffit-P213 , Gersdorffit-Pa3 , Gersdorffit-Pca21 , Hollingworthit , Irarsit , Jolliffeit , Kalungait , Krutovit , Michenerit, Mayingit, Milotait , Padmait, Platarsit , Testibiopalladit, Tolovkit , Ullmannit and Willyamit the " Gersdorffitgruppe "with the system no. 2.EB.25 forms.

The systematics of minerals according to Dana , which is mainly used in the English-speaking world , assigns the maslovit to the class of "sulfides and sulfosalts" and there in the department of "sulfide minerals". Here it is in the " cobaltite group (cubic or pseudocubic crystals) " with the system no. 02.12.03 within the subsection "Sulphides - including selenides and tellurides - with the composition A m B n X p , with (m + n): p = 1: 2".

Chemism

The idealized (theoretical) composition of Maslovit (PtBiTe) consists of platinum (Pt), bismuth (Bi) and tellurium (Te) in a molar ratio of 1: 1: 1. This corresponds to a mass fraction (% by weight) of 36.69% Pt , 39.31% Bi and 24.00% Te.

However, the microprobe analysis of nine grains of the type material from the Oktyabr'skoye mine in Russia showed the following contents in% by weight:

element rehearse
1 2 3 4th 5 6th 7th 8th 9
Pt 28.6 28.1 26.6 25.7 21.3 21.0 21.0 19.75 20.3
Bi 49.6 50.3 53.0 52.8 47.8 47.3 49.0 47.77 49.1
Te 16.9 16.8 15.7 15.8 18.9 19.8 20.1 19.05 19.1
Pd 4.5 5.0 5.6 7.1 10.3 10.5 10.6 10.25 11.1
Sb 0.8 0.6 1.6 1.1 1.3 1.5 1.2 0.93 1.4
Pb 1.1 1.2 0.0 0.0 0.0 0.0 0.0 1.02 0.0
Sum (Σ) 101.5 102.0 102.5 102.5 99.6 100.1 101.9 98.77 101.3

In addition to reduced contents of Pt, Bi and Te, small amounts of palladium (Pd) and antimony (Sb) as well as traces of lead (Pb), which represent some of the original elements ( substitution , diadochy), were measured .

Crystal structure

Maslovit crystallizes cubically in the space group Pa 3 (space group no. 205) with the lattice parameter a  = 6.687  Å and four formula units per unit cell . Template: room group / 205

Education and Locations

Maslovite forms massive cubanite - chalcopyrite - and Mooihoekite ores in areas rich in galena . In addition to these, altaite , atokite , froodite , hessite , moncheit , michenerite , paolovite , rustenburgite , sobolevskite , sperrylite and tatyanaite can occur as accompanying minerals .

As a rare mineral formation, Maslovit could only be detected in a few places, with 25 sites being documented so far (as of 2020). In addition to its type locality , the Oktyabr'skoye mine near Talnach and the nearby PGE / Pt-Cu-Ni-sulfide deposit Maslovsky near Norilsk in the Krasnoyarsk region of Siberia , the mineral was also found in Russia near Montschegorsk and the platinum Loypishnyun deposit in the Murmansk Oblast in Montschetundra in the federation district of northwestern Russia and in the Yoko-Dovyrensky massif near Lake Baikal in the Russian Republic of Buryatia and in the Cu-PGE deposit Anomal'niy in the Kondjor massif in the Republic of Sakha (Yakutia) in Far East Federal District.

The only other known location in Europe so far is the Ni-Cu-PGE deposit Keivitsansarvi near the municipality of Sodankylä in the Finnish part of Lapland.

Other locations include Brazil, China, Canada, Zimbabwe and South Africa.

See also

literature

  • В. А. Коваленкер, В. Д. Бегизов, Т. Л. Евстигнеева, Н. В. Тронева, В. А. Рябикин: Масловит PtBiTe - Новый минерал из Октябрьского Медно-никелевого Месторождения . In: Geologiya Rudnykh Mestorozhdenii . tape 21 , 1979, pp. 94–104 (Russian, rruff.info [PDF; 972 kB ; accessed on April 20, 2020] English translation : VA Kovalenker, VD Begizov, TL Evstigneeva, NV Troneva, VA Ryabikin: Maslovite, PtBiTe: a new mineral from the October copper-nickel deposit).
  • Michael Fleischer, Louis J. Cabri, Adolf Pabst: New mineral names . In: American Mineralogist . tape 65 , 1980, pp. 406–408 ( rruff.info [PDF; 387 kB ; accessed on April 20, 2020]).
  • Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason , Abraham Rosenzweig: Dana's New Mineralogy . 8th edition. John Wiley & Sons, New York et al. 1997, ISBN 0-471-19310-0 , pp. 127-128 .

Web links

Individual evidence

  1. ↑ a b c Malcolm Back, William D. Birch, Michel Blondieau and others: The New IMA List of Minerals - A Work in Progress - Updated: March 2020. (PDF; 2.44 MB) In: cnmnc.main.jp. IMA / CNMNC, Marco Pasero, March 2020, accessed April 20, 2020 .
  2. ↑ a b c d e Maslovite . In: John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Eds.): Handbook of Mineralogy, Mineralogical Society of America . 2001 (English, handbookofmineralogy.org [PDF; 62  kB ; accessed on April 20, 2020]).
  3. ^ A b c Peter Bayliss: Crystal chemistry and crystallography of some minerals within the pyrite group . In: American Mineralogist . tape 74 , 1989, pp. 1168–1176 (English, rruff.info [PDF; 1,2 MB ; accessed on April 20, 2020]).
  4. ↑ a b c 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 .
  5. ↑ Catalog of Type Mineral Specimens - M. (PDF 124 kB) In: docs.wixstatic.com. Commission on Museums (IMA), December 12, 2018, accessed April 20, 2020 .
  6. ↑ Ernest H. Nickel, Monte C. Nichols: IMA / CNMNC List of Minerals 2009. (PDF; 1.82 MB) In: cnmnc.main.jp. IMA / CNMNC, January 2009, accessed April 20, 2020 .
  7. ↑ Maslovit. In: Mineralienatlas Lexikon. Stefan Schorn u. a., accessed on April 20, 2020 .
  8. ↑ Michael Fleischer, Louis J. Cabri, Adolf Pabst: New mineral names . In: American Mineralogist . tape 65 , 1980, pp. 406–408 ( rruff.info [PDF; 387 kB ; accessed on April 20, 2020]).
  9. ↑ Localities for Maslovite. In: mindat.org. Hudson Institute of Mineralogy, accessed April 20, 2020 .
  10. ↑ Find location list for Maslovit in the Mineralienatlas and Mindat , accessed on April 19, 2020.