Ercitite Mineral Data

Ercitite Mineral Data

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General Ercitite Information

Chemical Formula:

Na(Mn+++,Fe+++)(PO4)(OH)·2(H2O)

Composition:

Molecular Weight = 226.35 gm

Sodium 10.16 % Na 13.69 % Na₂O

Manganese 13.35 % Mn 19.18 % Mn₂O₃

Iron 11.10 % Fe 15.87 % Fe₂O₃

Phosphorus 13.68 % P 31.36 % P₂O₅

Hydrogen 2.23 % H 19.90 % H₂O

Oxygen 49.48 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaMn³⁺_0.55Fe³⁺_0.45(PO₄)(OH)·2(H₂O)

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.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Tanco pegmatite at Bernic Lake, southeastern Maitoba, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for mineralogist T. Scott Ercit (1957-) of the Canadian Museum of Nature, Ottawa, Canada.

Synonym:

IMA1999-036

Ercitite Image

Images:

Ercitite

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

Axial Ratios:

a:b:c =0.2695:1:0.2695

Cell Dimensions:

a = 5.362, b = 19.89, c = 5.362, Z = 4; beta = 108.97° V = 540.80 Den(Calc)= 2.78

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/n

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

[101] Very Good, [010] Very Good

Color:

Dark brown, Black.

Diaphaniety:

Translucent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

beige

Optical Properties of Ercitite

Gladstone-Dale:

CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2579,KC= 0.2588

Optical Data:

Biaxial (+), a=1.699, b=1.715, g=1.737, bire=0.0380

Calculated Properties of Ercitite

Electron Density:

r_electron=2.76 gm/cc
note: r_Ercitite=2.78 gm/cc.

Fermion Index

Fermion Index = 0.00259
Boson Index = 0.99741

Photoelectric:

PE_Ercitite= 7.45 barns/electron
U=PE_Ercitite x r_electron= 20.59 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ercitite is Not Radioactive

Ercitite Classification

Dana Class:

42.11.17.2 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.17)Dana Group

42.11.17.1 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

42.11.17.2 Ercitite ! Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

Strunz Class:

VII/D.11-135 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.11 - Strunzite series

VII/D.11-10 Ferrostrunzite FeFe2(PO4)2(OH)2·6(H2O) P 1,P1 Tri

VII/D.11-20 Strunzite MnFe2(PO4)2(OH)2·6(H2O) P1 1

VII/D.11-30 Ferristrunzite FeFe2(PO4)2(OH)3·5(H2O) P1,P 1 Tri

VII/D.11-40 Bermanite MnMn2(PO4)2(OH)2·4(H2O) P 2₁ 2

VII/D.11-50 Cacoxenite (Fe,Al)25(PO4)17O6(OH)12·75(H2O) P 6/mmm 6/m 2/m 2/m

VII/D.11-60 Tinticite Fe5(PO4,VO4)4·7(H2O) P1 1

VII/D.11-70 Beraunite FeFe5(PO4)4(OH)5·4(H2O) C 2/c 2/m

VII/D.11-71 Oxiberaunite* (Fe,Mn)Fe5(PO4)4O(OH)4·6(H2O) Mono

VII/D.11-90 Souzalite (Mg,Fe)3(Al,Fe)4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-100 Gormanite Fe3Al4(PO4)4(OH)6·2(H2O) P1,P 1 Tri

VII/D.11-110 Dufrenite FeFe4(PO4)3(OH)5·2(H2O) C 2/c 2/m

VII/D.11-120 Burangaite (Na,Ca)2(Fe,Mg)2Al10(PO4)8(OH,O)12·4(H2O) C 2/c 2/m

VII/D.11-130 Natrodufrenite Na(Fe,Fe)(Fe,Al)5(PO4)4(OH)6·2(H2O) C 2/c 2/m

VII/D.11-135 Ercitite Na(Mn,Fe)(PO4)(OH)·2(H2O) P 2₁/n 2/m

VII/D.11-140 Kidwellite Na(Fe,Cu)9x(PO4)6(OH)11·3(H2O) P 2/c 2/m

VII/D.11-150 Meurigite! KFe7(PO4)5(OH)7·8(H2O) C 2,Cm,C 2/m Mono

Other Ercitite Information

References:

NAME( AmMin, vol 86, p767) PHYS. PROP.(AmMin, vol 86, p767) OPTIC PROP.(AmMin, vol 86, p767)

See Also:

Links to other databases for Ercitite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Ercitite

Na(Mn+++,Fe+++)(PO4)(OH)·2(H2O)
Dana No: 42.11.17.2 Strunz No: VII/D.11-135
Locality:

Notes: