In hydrothermal deposits formed at moderate temperatures but also found in contact metasomatic replacements, and epithermal replacements as well as in pegmatites.
IMA Status:
Approved IMA 1970
Locality:
Deer Park, Stevens County, Washington, USA. Link to MinDat.org Location Data.
Name Origin:
Named for the composition, Cobalt and STIBium (Latin name for Antimony).
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Rowland J F , Gabe E J , Hall S R , The Canadian Mineralogist , 13 (1975) p.188-196, The crystal structures of costibite (CoSbS) and paracostibite(CoSbS)
Physical Properties of Costibite
Color:
Steel gray.
Density:
6.89
Diaphaneity:
Opaque
Habit:
Inclusions - Generally found as inclusions in other minerals.
Habit:
Lamellar - Thin laminae producing a lamellar structure.
Hardness:
6 - Orthoclase
Luster:
Metallic
Optical Properties of Costibite
RL Anisotrophism:
Weak, reddish brown or orange, to bluish.
RL Color:
Grayish.
RL Pleochroism:
Weak, gray-white with bluish and brownish tints.
Calculated Properties of Costibite
Electron Density:
Bulk Density (Electron Density)=7.36 gm/cc note: Specific Gravity of Costibite =8.33 gm/cc.
Fermion Index:
Fermion Index = 0.0011304155 Boson Index = 0.9988695845
Photoelectric:
PECostibite = 201.52 barns/electron U=PECostibite x rElectron Density=1,483.36 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Costibite is Not Radioactive
Costibite Classification
Dana Class:
02.12.07.01(02)Sulfides - Including Selenides and Tellurides