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Ercitite Mineral Data

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General Ercitite Information

Help on Chemical  Formula: Chemical Formula: Na2(H2O)4[Mn+++2(OH)2(PO4)2]
Help on Composition: Composition: Molecular Weight = 225.83 gm
   Sodium       9.06 %  Na   12.21 % Na2O
   Calcium      0.71 %  Ca    0.99 % CaO
   Manganese   12.89 %  Mn   18.53 % Mn2O3
   Iron        11.38 %  Fe   16.26 % Fe2O3
   Phosphorus  13.85 %  P    31.74 % P2O5
   Hydrogen     2.23 %  H    19.94 % H2O
   Oxygen      49.88 %  O
              ______        ______ 
              100.00 %       99.68 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.89Ca0.04Mn3+0.53Fe3+0.46(PO4)1.01(OH)•2(H2O)
Help on Environment: Environment: Strongly oxidizing, low-temperature hydrothermal alteration. Found as an overgrowth on collinsite, fairfieldite, whitlockite, and other phosphates on a fracture surface the cuts an altered nodule of lithophllite.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Tanco pegmatite at Bernic Lake, southeastern Maitoba, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for mineralogist T. Scott Ercit (1957-) of the Canadian Museum of Nature, Ottawa, Canada.
Help on Synonym: Synonym: IMA1999-036

Ercitite Image

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Comments: Back-scattered electron images of ercitite (medium gray) showing lath-shaped habit and cleavages and splintering on mechanical disturbance. W: whitlockite, F: fairfieldite, C: unidentified. (CanMin, v 38, p 896).
Location: Tanco pegmatite, southeastern Manitoba, Canada. Scale: Image size 150 µ-m.
© Canadian Mineralogist

Ercitite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7144:1:2.2811
Help on Cell Dimensions: Cell Dimensions: a = 6.2499, b = 8.7479, c = 19.9554, Z = 8; V = 1,091.03 Den(Calc)= 2.75
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mca
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.9(1)(020), 2.664(0.8)(141), 3.126(0.6)(150,051),3.273(0.6)(141), 4.92(0.5)(011,110), 2.376(0.4)(171), 2.542(0.4)(200,002), 4.102(0.3),

Physical Properties of Ercitite

Help on Cleavage: Cleavage: {101} Very Good, {010} Very Good
Help on Color: Color: Dark brown, Black.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Irregular - Very brittle fracture producing irregular fragments
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: beige

Optical Properties of Ercitite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2607,KC= 0.2582
Ncalc = 1.71
Help on Optical Data: Optical Data: Biaxial (+), a=1.699, b=1.715, g=1.737, bire=0.0380

Calculated Properties of Ercitite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Ercitite =2.75 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0026639768
Boson Index = 0.9973360232
Help on Photoelectric: Photoelectric: PEErcitite = 7.50 barns/electron
U=PEErcitite x rElectron Density= 20.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ercitite is Not Radioactive

Ercitite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.17)Bermanite Group Bermanite MnMn2(PO4)2(OH)2•4(H2O) P 21 2 Ercitite! Na2(H2O)4[Mn2(OH)2(PO4)2] C mca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.DJ.35 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DJ -With large and medium-sized cations, (OH, etc.):RO4 = 1:l
08.DJ.35 Ercitite! Na2(H2O)4[Mn2(OH)2(PO4)2] C mca 2/m 2/m 2/m

Other Ercitite Information

Help on References: References: NAME( AmMin, vol 86, p767) PHYS. PROP.(AmMin, v86:767; CanMin, v47:173) OPTIC PROP.(AmMin, vol 86, p767)
Help on See Also: See Also: Links to other databases for Ercitite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 08.DJ.35





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