Haycockite

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Haycockite
General and classification
other names

IMA 1971-028

chemical formula Cu 4 Fe 5 S 8
Mineral class
(and possibly department) 		Sulfides and sulfosalts
System no. to Strunz
and to Dana 		2.CB.10 ( 8th edition : II / C.04)
02.09.08.02
Crystallographic Data
Crystal system orthorhombic
Crystal class ; symbol orthorhombic-disphenoidic; 222 , P 222 1 (no.17) , P 2 1 2 1 2 (no.18) or P 2 1 2 1 2 1 (no.19)Template: room group / 17Template: room group / 18Template: room group / 19
Space group P 222 (No. 16)Template: room group / 16
Lattice parameters a  = 10.705  Å ; b  = 10.734 Å; c  = 31.630 Å
Formula units Z  = 12
Twinning poysynthetic along {103}
Physical Properties
Mohs hardness 4.5 (VHN 100 = 206-231)
Density (g / cm 3 ) calculated: 4.33
Cleavage Please complete!
colour Brass yellow, similar to chalcopyrite
Line color black
transparency opaque
shine Metallic luster

Haycockite is a very rare mineral from the mineral class of sulfides and sulfosalts . It crystallizes in the orthorhombic crystal system with the chemical composition Cu 4 Fe 5 S 8 and forms very small, up to 0.5 mm large, brass-colored grains.

Etymology and history

The mineral was first described in 1972 by Louis J. Cabri and Sydney R. Hall. The type material was found in 1929 by E. Sampson on the Mooihoek Farm near Lydenburg in the eastern Bushveld complex in South Africa . They named it after Maurice Hall Haycock (1900–1988), the former head of the mineral department in the Canadian Department of Energy and Mining.

classification

In the Strunz system , haycockite is classified as sulfides and sulfosalts. It is counted among the sulphides with a ratio of metal to sulfur, selenium or tellurium of 1: 1. In the eighth edition , it formed a group with Mooihoekite , Isocubanite , Putoranite , Orickite , Talnakhite and Wilhelmramsayit . In the ninth edition , the sulphides are also subdivided according to cations, where haycockite mt chalcopyrite , eskebornite , mooihoekite, laforêtite , lenaite , putoranite, gallite , roquesite and talnakhite form a subgroup of metal sulphides with a ratio of metal to sulfur, selenium or tellurium of 1 : 1 and zinc , iron , copper or silver .

In the systematics of minerals according to Dana , it forms with Mooihoekite and Talnakhite a subgroup of sulphides - including selenides and tellurides - with the composition Am Bn Xp, with (m + n): p = 1: 1.

Crystal structure

Haycockite crystallizes in the orthorhombic crystal system in the space group P 222 (space group No. 16) , P 222 1 (No. 17) , P 2 1 2 1 2 (No. 18) or P 2 1 2 1 2 1 (No. 19 ) with the lattice parameters a = 10.705  Å , b = 10.734 Å and c = 31.63 Å as well as 12 formula units per unit cell . Template: room group / 16Template: room group / 17Template: room group / 18Template: room group / 19

Education and Locations

Haycockite forms in dunite . It is associated with mooihoekite, copper, troilite, pentlandite, cubanite and magnetite.

Almost 10 sites of the mineral are known worldwide. In addition to the type locality and Rustenburg in South Africa, Haycockite was found in Shibukawa in Japan, Moctezuma (Sonora) | Moctezuma in Mexico, Krakow and Suwałki in Poland , Duluth in the United States and on the Mid-Atlantic Ridge .

See also

literature

  • Louis J. Cabri, Sydney R. Hall: Mooihoekite and haycockite, two new copper-iron sulfides, and their relationship to chalcopyrite and talnakhite . In: American Mineralogist . tape 57 , 1972, p. 689–708 ( minsocam.org [PDF; 1.5 MB ; accessed on November 14, 2017]).

Web links

Individual evidence

  1. ^ JF Rowland and SR Hall: Haycockite, Cu 4 Fe 5 S 8 : a superstructure in the chalcopyrite series . In: Acta Crystallographica Section B . B 31, 1975, p. 2105-2112 , doi : 10.1107 / S0567740875006929 .
  2. ↑ a b c d Haycockite . 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 November 14, 2017]).
  3. ↑ a b c Mindat - Haycockite (English)
  4. ↑ 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.  316 .
  5. ↑ Louis J. Cabri, Sydney R. Hall: Mooihoekite and haycockite, two new copper-iron sulfides, and their relationship to chalcopyrite and talnakhite . In: American Mineralogist . tape 57 , 1972, p. 689–708 ( minsocam.org [PDF; 1.5 MB ; accessed on November 14, 2017]).
  6. ↑ Find location list for Haycockit in the Mineralienatlas and in Mindat