Secondary mineral in the oxidized zone of hydrothermal base metal deposits. Duftite-beta (1956) is now considered a compositional intermediate in the duftite-conichalcite series
IMA Status:
Discredited IMA 2006
Locality:
Tsumeb, Namibia. Link to MinDat.org Location Data.
Name Origin:
Named in 1920 for G. Duft, general manager of the mine at Tsumeb, Namibia.
CI meas= -0.103 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.069 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1626,KPDmeas= 0.1677,KC= 0.1521 Ncalc = 1.97 - 2
Optical Data:
Biaxial (-), a=2.04, b=2.08, g=2.1, bire=0.0600
Calculated Properties of Duftite-beta
Electron Density:
Bulk Density (Electron Density)=5.72 gm/cc note: Specific Gravity of Duftite-beta =6.60 gm/cc.
Fermion Index:
Fermion Index = 0.1 Boson Index = 0.9
Photoelectric:
PEDuftite-beta = 879.99 barns/electron U=PEDuftite-beta x rElectron Density=5,036.53 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Duftite-beta is Not Radioactive
Duftite-beta Classification
Dana Class:
41.05.01.04(41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen