Secondary mineral in the oxidized zone of some hydrothermal copper deposits.
IMA Status:
Valid Species (Pre-IMA) 1917
Locality:
Star of the Congo mine, near Lubumbashi, and at the Kalabi and Lukini mines, Katanga Province, Congo (Shaba Province, Zaire). Link to MinDat.org Location Data.
Name Origin:
Named for Jules Cornet (1865-1929), Belgian geologist.
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Physical Properties of Cornetite
Color:
Greenish blue, Dark blue.
Optical Properties of Cornetite
Gladstone-Dale:
CI meas= -0.045 (Good) - where the CI = (1-KPDmeas/KC) CI calc= -0.045 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1947,KPDmeas= 0.1947,KC= 0.1864 Ncalc = 1.76
Calculated Properties of Cornetite
Electron Density:
Bulk Density (Electron Density)=3.92 gm/cc note: Specific Gravity of Cornetite =4.10 gm/cc.
Fermion Index:
Fermion Index = 0.0001610413 Boson Index = 0.9998389587
Photoelectric:
PECornetite = 25.40 barns/electron U=PECornetite x rElectron Density= 99.62 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Cornetite is Not Radioactive
Cornetite Classification
Dana Class:
41.03.02.01(41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
Chemical Formula: 
