Allactite Mineral Data

Allactite Mineral Data
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Hudson Institute of Mineralogy

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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Allactite

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:

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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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Click Here for Large Allactite Structure Window Crystal Structure:

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Moore P B , American Mineralogist , 53 (1968) p.733-741, Crystal chemistry of the basic manganese arsenate minerals: II. The crystal, structure of allactite

 

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: 41.02.01.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.02)where (A B)7 (XO4)2 Zq
  (41.02.01)Allactite Group
 
41.02.01.01 Allactite Mn7(AsO4)2(OH)8 P 21/a 2/m
 
41.02.01.02 Raadeite! Mg7(PO4)2(OH)8 P 21/n 2/m
 
41.02.01.03 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
17 - WWW-MINCRYST

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Ask about Allactite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Allactite Specimen Label here :

Allactite

Mn7(AsO4)2(OH)8
Dana No: 41.02.01.01 Strunz No: 08.BE.30
Locality:

 

Notes: