Metacinnabar

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Metacinnabar

Metacinnabar-233443.jpg
General
Category
Sulfide mineral

Formula
(repeating unit)

HgS
Strunz classification
2.CB.05a
Crystal system
Cubic
Crystal class
Hextetrahedral (43m)
H-M symbol: (4 3m)
Space group
F43m
Unit cell
a = 5.8717(5) Å; Z = 4
Identification
Color
Grayish black
Crystal habit
Massive, rarely as tetrahedral crystals, as incrustations
Twinning
Common as lamellae on 111
Cleavage
None
Fracture
Subconchoidal
Tenacity
Brittle

Mohs scale hardness

3
Luster
Metallic
Streak
Black
Diaphaneity
Opaque
Specific gravity
7.7 - 7.8
References
[1][2][3]

Metacinnabar is the cubic form of mercury sulfide (HgS). It is the low temperature form and trimorphous with cinnabar (trigonal structure) and the high temperature hypercinnabar (hexagonal structure). It occurs with cinnabar in mercury deposits and is associated with native mercury, wurtzite, stibnite, marcasite, realgar, calcite, barite,
chalcedony and hydrocarbons.[1]


It was first described in 1870 for an occurrence in the Redington mine, Knoxville, Napa County, California.[2][3]



References




  1. ^ ab Metacinnabar in the Handbook of Mineralogy


  2. ^ ab Metacinnabar on Mindat.org


  3. ^ ab Metacinnabar data on Webmineral







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