Lisiguangit

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Lisiguangit
General and classification
other names

IMA 2007-003

chemical formula CuPtBiS 3
Mineral class
(and possibly department) 		Sulfides and sulfosalts
System no. to Strunz
and to Dana 		2.GA.25
04/03/04/04
Crystallographic Data
Crystal system orthorhombic
Crystal class ; symbol rhombic-disphenoidic 222
Space group
Lattice parameters a  = 7.7152  Å ; b  = 12.838 Å; c  = 4.9248 Å
Formula units Z  = 4
Physical Properties
Mohs hardness 2.5 (VHN 25 = 46.7 to 49.8 kg / mm 2 )
Density (g / cm 3 ) calculated: 7.42
Cleavage completely after {010}, clearly after {001}, visible after {100}
Break ; Tenacity brittle
colour lead gray
Line color black
transparency opaque
shine Metallic luster

Lisiguangite (Chinese 李四光 矿 , Lisiguangkuang ) 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 CuPtBiS 3 and thus represents the platinum analogue of Mückeit (CuNiBiS 3 ).

Lisiguangit develops small, idiomorphic, tabular or lamellar crystals up to about 2 mm in length and 0.5 mm in width of a lead-gray color with black streak color . Under polarized, reflected light, however, Lisiguangite appears bright white with a yellowish tinge.

Etymology and history

Lisinguanite was first discovered and described by Yu Zuxiang in the Yan Shan in Luanping County of the prefecture of Chengde in the northern Chinese province of Hebei and named after the Chinese Minister of Geology Li Siguang (1889–1971).

The mineral is registered with the Commission on New Minerals, Nomenclature and Classification (CNMNC) of the International Mineralogical Association (IMA) under the number IMA2007-003 .

classification

Since Lisiguangite was only recognized as an independent mineral in 2007, it is not listed in the Strunz mineral system (8th edition), which has been outdated since 2001 .

The 9th edition of Strunz's mineral systematics, also used by the IMA, assigns the lisiguangite to the class of "sulfides and sulfosalts (sulfides, selenides, tellurides, arsenides, antimonides, bismuthides, sulfarsenites, sulfantimonites, sulfbismuthites)" and there in the department the "sulfoarsenide, sulfoantimonide, sulfobismuthide". However, this section is further subdivided according to the type of linkage of the sulfide complex and the presence of additional sulfur , so that the mineral can be found according to its composition in the sub-section "Island sulfarsenides (Neso sulfarsenides) etc., without additional sulfur (S)" , where together with Lapieit , Malyshevit and Mückeit it forms the unnamed group 2.GA.25 .

The systematics of the minerals according to Dana also assigns the lisiguangite to the class of "sulfides and sulfosalts" and there in the department of "sulfosalts". Here he is, also together with Lapieit, Malyshevit and Mückeit, a member of the "Lapieitgruppe" with the system no. 04/03/04 within the subdivision of " sulfosalts with the ratio 3> z / y and the composition (A +) i (A2 +) j [ByCz], A = metals, B = semi-metals, C = non-metals "

Education and Locations

Until now, Lisiguangit could only be detected in its type locality , the region of Chengde. It is found in contact metamorphic rocks in deeper parts of the Sandaogou copper ore occurrence, where platinum occurs in ten times greater concentration than in the higher parts of the deposit . Lisiguangite occurs here in paragenesis with bornite , chalcopyrite , carrollite , galena , molybdenite , pyrite and tenorite .

Crystal structure

Lisinguanite crystallizes orthorhombically in the space group P 2 1 2 1 2 1 with the lattice parameters a  = 7.7152  Å ; b  = 12.838 Å and c  = 4.9248 Å and 4 formula units per unit cell .

See also

Individual evidence

  1. ↑ a b c d e f g Webmineral - Lisiguangite (English)
  2. ↑ a b American Mineralogist Crystal Structure Database - Lsiguangite (English, 2009)
  3. ↑ a b c d e f g Paula C. Piilonen, Glenn Poirier, Kimberly T. Tait: New Mineral Names . In: American Mineralogist (2009), Volume 94, pages 1495–1501 (English, PDF 622.2 kB; p. 4)
  4. ↑ IMA / CNMNC List of Mineral Names - IMA 2007-003 (CuPtBiS 3 ) (English, PDF 1.8 MB; p. 131)
  5. ↑ Mindat - Lisiguangite (English)
  6. ↑ American Mineralogist Crystal Structure Database - Lsiguangite (English, 2009)

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