Glaucodot from Håkansboda, Lindesberg, Sweden. Size: 3.3 x 2.7 x 2.6 cm.
|Color||Grayish tin white, Reddish silver white|
|Crystal habit||Massive - Uniformly indistinguishable crystals forming large masses.|
|Crystal system||Orthorhombic (2/m 2/m 2/m) Space Group: C mmm|
|Fracture||Brittle - Uneven - Very brittle fracture producing uneven fragments.|
|Mohs scale hardness||5|
|Specific gravity||5.9 - 6.01, Average = 5.95|
|Other characteristics||Nonmagnetic, non-radioactive|
Glaucodot is a cobalt iron arsenic sulfide mineral with formula: (Co,Fe)AsS. The cobalt:iron(II) ratio is typically 3:1 with minor nickel substituting. It forms a series with arsenopyrite (FeAsS). It is an opaque grey to tin-white typically found as massive forms without external crystal form. It crystallizes in the orthorhombic system. The locality at Håkansboda, Sweden has rare twinned dipyramidal crystals (see photo). It is brittle with a Mohs hardness of 5 and a specific gravity of 5.95. It occurs in high temperature hydrothermal deposits with pyrrhotite and chalcopyrite. Glaucodot is classed as a sulfide in the arsenopyrite löllingite group.
- Mindat with location data
- Scandinavian mineral gallery
- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., p. 288, ISBN 0-471-80580-7
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