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Allactite Mineral Data

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General Allactite Information

Help on Chemical  Formula: Chemical Formula: Mn7(AsO4)2(OH)8
Help on Composition: Composition: Molecular Weight = 798.46 gm
   Manganese  48.16 %  Mn   62.19 % MnO
   Arsenic    18.77 %  As   28.79 % As2O5
   Hydrogen    1.01 %  H     9.02 % H2O
   Oxygen     32.06 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+7(AsO4)2(OH)8
Help on Environment: Environment: Occurs as a rare secondary mineral in veinlets through metamorphosed manganese deposits )Sweden); in a metamorphosed stratiform zinc orebody (Franklin, New Jersey, USA).
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1884
Help on Locality: 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.
Help on Name Origin: Name Origin: From the Greek, to change, a reference to the strong pleochroism.
Help on Name Pronunciation: Name Pronunciation: Allactite + Pronunciation Say ALLACTITE
Help on Synonym: Synonym: Elfstorpite - Discredited 2004
  ICSD 24428
  PDF 17-748

Allactite Image

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Comments: Brownish red allactite crystals.
Location: Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Allactite Crystallography

Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.06(1), 3.71(0.65), 3.28(0.55),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 1 1 1) ( 2 1 0) ( 0 1 0) ( 2 0 1) ( 0 2 1) ( 1 0 0) ( 2 0 1) ( 3 2 1) ( 0 0 1)

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Physical Properties of Allactite

Help on Color: Color: Brown red, Greenish brown, Purple red, Pink.

Optical Properties of Allactite

Help on Gladstone-Dale: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.62 gm/cc
note: Specific Gravity of Allactite =3.83 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0001554046
Boson Index = 0.9998445954
Help on Photoelectric: Photoelectric: PEAllactite = 25.48 barns/electron
U=PEAllactite x rElectron Density= 92.14 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Allactite is Not Radioactive

Allactite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.02)where (A B)7 (XO4)2 Zq
  (41.02.01)Allactite Group Allactite Mn7(AsO4)2(OH)8 P 21/a 2/m Raadeite! Mg7(PO4)2(OH)8 P 21/n 2/m Waterhouseite! Mn7(PO4)2(OH)8 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.BE.30 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1
08.BE.30 Allactite Mn7(AsO4)2(OH)8 P 21/a 2/m
08.BE.30 Flinkite Mn2Mn(AsO4)(OH)4 P nma 2/m 2/m 2/m
08.BE.30 Raadeite! Mg7(PO4)2(OH)8 P 21/n 2/m

Other Allactite Information

Help on See Also: See Also: Links to other databases for Allactite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - Franklin Minerals(Palache)
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info

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Dana No: Strunz No: 08.BE.30




Strunz No: 08.BE.30


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