Raguinit

Raguinit
	Striped gray-metallic raguinite crystals on realgar from the type locality Allchar, Macedonia
General and classification
other names	IMA 1968-022
chemical formula	TlFeS 2
Mineral class; (and possibly department)	Sulfides and sulfosalts
System no. to Strunz ; and to Dana	2.CB.60 ( 8th edition : II / C.05) ; 02.09.09.01
Crystallographic Data
Crystal system	monoclinic
Crystal class ; symbol	monoclinic prismatic; 2 / m
Space group	C 2 / m
Lattice parameters	a = 11.68 Å ; b = 5.32 Å; c = 10.53 Å ; β = 144.60 °
Formula units	Z = 4
Physical Properties
Mohs hardness	Please complete
Density (g / cm 3 )	measured: 6.4 (2); calculated: 6.29
Cleavage	Please complete
colour	bronze colored
Line color	Please complete
transparency	opaque
shine	Metallic luster

Raguinite is a very rarely occurring mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the orthorhombic crystal system with the chemical composition TlFeS ₂ and forms pseudo-hexagonal bronze-colored plates, which consist of fibers closely interwoven with pyrite.

Etymology and history

The mineral was first found in 1969 by Yvette Laurent, Paul Picot, Roland Pierrot, Francois Permigneate and T. Iwanow in Allchar , Macedonia. They named it after the French mineralogy professor E. Raguin.

classification

Already in the outdated, but partly still in use 8th edition of the mineral classification according to Strunz , the raguinite belonged to the mineral class of "sulfides and sulfosalts" and there to the department of "sulfides with the molar ratio of metal: S, Se, Te ≈ 1: 1", where together with picotpaulite he formed the unnamed group II / C.05 .

The 9th edition of Strunz's mineral systematics , which has been in effect since 2001 and is used by the International Mineralogical Association (IMA), also classifies raguinite in the category of “metal sulfides with a molar ratio of M: S = 1: 1 (and similar)”. However, this is further subdivided according to the predominant metals in the compound, so that the mineral can be found in the sub-section "with zinc (Zn), iron (Fe), copper (Cu), silver (Ag) etc." according to its composition , where it is named after the "Raguinitgruppe" with the system no. 2.CB.60 and the other member picotpaulite.

The systematics of minerals according to Dana , which is predominantly used in the English-speaking world , assigns the to the class of "sulfides and sulfosalts" and there into the department of "sulfide minerals". Here he is the only member of the unnamed group 02.09.09 within the subsection “Sulphides - including selenides and tellurides - with the composition A _m B _n X _p , with (m + n): p = 1: 1”.

Education and Locations

Raguinite is formed under hydrothermal conditions. It is associated with pyrite , lorandite , auripigment , realgar and vrbait .

Only a few sites are known of the very rare mineral. In addition to the type locality , raguinite was only found in Xingren in China and in the Oquirrh Mountains in the US state of Utah .

Crystal structure

Raguinit crystallizes monoclinically in the space group C 2 / m (space group no. 12) with the lattice parameters a = 11.68 Å , b = 5.32 Å, c = 10.53 Å and β = 144.60 ° and four formula units per unit cell . Template: room group / 12

literature

Raguinite . 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; 439 kB ; accessed on May 9, 2018]).
D. Welz, P. Deppe, W. Schaefer, H. Sabrowsky, M. Rosenberg: Magnetism of iron-sulfur tetrahedral frameworks in compounds with thallium I. Chain structures . In: Journal of Physics and Chemistry of Solids . tape 50 , no. 3 , December 1989, pp. 297-308 , doi : 10.1016 / 0022-3697 (89) 90492-7 .
Johan Zdenek, Paul Picot, Roland Pierrot: Nouvelles donnees sur la raguinite . In: Bull. Soc. Ms. Mineral. Cristallogr. tape 92 , 1969, p. 237 .
Michael Fleischer: New Mineral Names . In: American Mineralogist . tape 54 , 1969, p. 1737–1742 ( minsocam.org [PDF; 439 kB ; accessed on May 9, 2018]).

Web links

Commons : Raguinite - collection of images, videos and audio files

Mineral Atlas: Raguinite
Mindat - Raguinite (English)
Webmineral - Raguinite (English)
American-Mineralogist-Crystal-Structure-Database - Raguinite (English)

Individual evidence

^ ^A ^b D. Welz, P. Deppe, W. Schaefer, H. Sabrowsky, M. Rosenberg: Magnetism of iron-sulfur tetrahedral frameworks in compounds with thallium I. Chain structures . In: Journal of Physics and Chemistry of Solids . tape 50 , no. 3 , December 1989, pp. 297-308 , doi : 10.1016 / 0022-3697 (89) 90492-7 .
↑ Raguinite . 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; 439 kB ; accessed on May 9, 2018]).
^ Yvette Laurent, Paul Picot, Roland Pierrot, Francois Permigneat and T. Iwanow: La raguinite, TlFeS ₂ , une nouvelle espece minerale et le probleme d'allcharite. In: Bull. Soc. Franc. Mineral., Cristallogr. 1969, 92, pp. 38-48 ( abstract in American Mineralogist ; PDF; 323 kB).

[Welz-et-al-1] A ^b D. Welz, P. Deppe, W. Schaefer, H. Sabrowsky, M. Rosenberg: Magnetism of iron-sulfur tetrahedral frameworks in compounds with thallium I. Chain structures . In: Journal of Physics and Chemistry of Solids . tape 50 , no. 3 , December 1989, pp. 297-308 , doi : 10.1016 / 0022-3697 (89) 90492-7 .

[Datenblatt-2] Raguinite . 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; 439 kB ; accessed on May 9, 2018]).

[Laurent-et-al-3] Yvette Laurent, Paul Picot, Roland Pierrot, Francois Permigneat and T. Iwanow: La raguinite, TlFeS ₂ , une nouvelle espece minerale et le probleme d'allcharite. In: Bull. Soc. Franc. Mineral., Cristallogr. 1969, 92, pp. 38-48 ( abstract in American Mineralogist ; PDF; 323 kB).