Occurs as a rare secondary mineral in veinlets through metamorphosed manganese deposits )Sweden); in a metamorphosed stratiform zinc orebody (Franklin, New Jersey, USA).
IMA Status:
Valid Species (Pre-IMA) 1884
Locality:
In Sweden, from the Moss and Brattfors mines, Nordmark, and at Langban, Varmland. From Franklin and Sterling Hill, Ogdensburg, Sussex Co., New Jersey, USA. Link to MinDat.org Location Data.
Name Origin:
From the Greek, to change, a reference to the strong pleochroism.
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Physical Properties of Allactite
Color:
Brown red, Greenish brown, Purple red, Pink.
Optical Properties of Allactite
Gladstone-Dale:
CI meas= -0.002 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1947,KPDmeas= 0.2003,KC= 0.1998 Ncalc = 1.77 - 1.79
Calculated Properties of Allactite
Electron Density:
Bulk Density (Electron Density)=3.62 gm/cc note: Specific Gravity of Allactite =3.83 gm/cc.
Fermion Index:
Fermion Index = 0.0001554046 Boson Index = 0.9998445954
Photoelectric:
PEAllactite = 25.48 barns/electron U=PEAllactite x rElectron Density= 92.14 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Allactite is Not Radioactive
Allactite Classification
Dana Class:
41.02.01.01(41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
Chemical Formula: 
