Schachnerite

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Schachnerite
General and classification
chemical formula Ag 1.1 Hg 0.9
Mineral class
(and possibly department)
Elements - metals and intermetallic alloys
System no. to Strunz
and to Dana
1.AD.15 ( 8th edition : I / A.02)
1.1.8.2
Crystallographic Data
Crystal system hexagonal
Crystal class ; symbol 6 / mmm
Space group P 6 3 / mmc
Lattice parameters a  = 2.978  Å ; c  = 4.842 Å Please complete the source as an individual reference!
Formula units Z  = 2 Please complete the source as an individual reference!
Physical Properties
Mohs hardness 3.5
Density (g / cm 3 ) 13.52
Cleavage indistinct
colour silver-gray metallic
Line color silver-white metallic
transparency opaque
shine metallic

Schachnerite is a very rare mineral from the mineral class of the elements, more precisely metals and intermetallic compounds . It crystallizes in the hexagonal crystal system with the chemical composition Ag 1.1 Hg 0.9 and forms crystals up to 1 cm in size.

Etymology and history

Schachnerite was first found in 1972 by E. Seeliger and A. Mücke in the type locality , the "trust-to-God" mercury mine on the Moschellandsberg near Obermoschel in Rhineland-Palatinate ( Germany ). It is named after the German mineralogist Doris Schachner .

classification

In the Strunz system , schachnerite is counted among the metals and intermetallic compounds, a subgroup of the elements. After the 8th edition , it forms a group together with Belendorffite , lead amalgam , eugenite , gold amalgam , kolymite , luanheit , moschellandsbergite , potarite , mercury , paraschachnerite and weishanite . In the 9th edition it forms a subgroup of the mercury amalgam family with eugenite, luanheit, moschellandsbergite and paraschachnerite.

In the systematics according to Dana it forms with lead amalgam, gold amalgam, luanheit, moschellandsbergite, eugenite, paraschachnerite and weishanite a subgroup (silver-amalgam alloys) of the metallic elements apart from the platinum metals .

Education and Locations

Schachnerite is formed by the aging of moschellandsbergite under oxidizing conditions . It is associated with paraschachnerite , acanthite , mercury , limonite , anchorite , argentite and cinnabarite .

In addition to the type locality, finds from Radnice in the Czech Republic , Allemond in the Isère department ( France ), Moctezuma in Mexico , Bashkortostan in Russia , Dobšiná and Kremnica in Slovakia , Sala in Sweden and Clark County in the US state of Nevada are known.

Crystal structure

Schachnerite crystallizes in the hexagonal crystal system in the space group P6 3 / mmc with the lattice parameters a = 2.978  Å and c = 4.842 Å as well as two formula units per unit cell .

See also

Individual evidence

  1. IMA / CNMNC List of Mineral Names (2012) (PDF 1.5 MB)
  2. ^ New Dana Classification of Native Elements

literature

  • Schachnerite. In: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).
  • E. Seeliger and A. Mücke: Schachnerite, Ag 1.1 , Hg 0.9 , and Paraschachnerite, Ag 1.2 Hg 0.8 , from Landsberg near Obermoschel, Pfalz. In: New Year Mineral. Treatise 1972, 117, 1-18. Abstract in: American Mineralogist , 1973, 58, p. 347 (English, pdf ).

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