In a matrix consisting primarily of braunite, sugilite, and hausmannite, cut by pectolite veinlets. Ba-analog to cuprorivaite and Cu-analog to gillespite.
IMA Status:
Approved IMA 1994
Locality:
Central-eastern orebody of the Wessels mine, Kalahari Manganese Field, NW Cape Province, Republic of South Africa. Link to MinDat.org Location Data.
Name Origin:
Named after Dr. Herta S. Effenberger, mineralogist and crystallographer of the University of Vienna.
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Physical Properties of Effenbergerite
Cleavage:
{001} Perfect, {110} Poor
Color:
Blue.
Density:
3.57 - 3.52, Average = 3.54
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Platy - Sheet forms (e.g. micas).
Hardness:
4-5 - Fluorite-Apatite
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Resinous
Streak:
pale blue
Optical Properties of Effenbergerite
Dichroism (e):
pale blue.
Dichroism (w):
intense blue.
Gladstone-Dale:
CI meas= 0.016 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1741,KPDmeas= 0.1729,KC= 0.1757 Ncalc = 1.62 - 1.63
Optical Data:
Uniaxial (-), e=1.593, w=1.633, bire=0.0400.
Calculated Properties of Effenbergerite
Electron Density:
Bulk Density (Electron Density)=3.29 gm/cc note: Specific Gravity of Effenbergerite =3.52 gm/cc.
Fermion Index:
Fermion Index = 0.06 Boson Index = 0.94
Photoelectric:
PEEffenbergerite = 131.55 barns/electron U=PEEffenbergerite x rElectron Density= 432.53 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Effenbergerite is Not Radioactive
Effenbergerite Classification
Dana Class:
71.02.03.03(71)Phyllosilicate Sheets of Six-Membered Rings
Chemical Formula: 
