Jahnsite-(CaMnFe) Mineral Data

Jahnsite-(CaMnFe) Mineral Data +

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General Jahnsite-(CaMnFe) Information

Chemical Formula:

CaMn++Fe++2Fe+++2(PO4)4(OH)2·8(H2O)

Composition:

Molecular Weight = 876.43 gm

Calcium 4.57 % Ca 6.40 % CaO

Manganese 6.27 % Mn 8.09 % MnO

Iron 25.49 % Fe 16.40 % FeO / 18.22 % Fe₂O₃

Phosphorus 14.14 % P 32.39 % P₂O₅

Hydrogen 2.07 % H 18.50 % H₂O

Oxygen 47.46 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMn²⁺Fe²⁺₂Fe³⁺₂(PO₄)₄(OH)₂·8(H₂O)

IMA Status:

Approved IMA 1978

Locality:

Fletcher mine, North Groton, New Hampsire, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Richard H. Jahns (1915-1983), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA.

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Jahnsite-(CaMnFe) Crystallography

Axial Ratios:

a:b:c =2.0993:1:1.3804

Cell Dimensions:

a = 15.01, b = 7.15, c = 9.87, Z = 2; beta = 111.23° V = 987.38 Den(Calc)= 2.95

Crystal System:

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

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

By Intensity(I/I_o): 9.15(1), 2.81(0.5), 4.6(0.4),3.45(0.3), 3.48(0.3), 1.874(0.2), 4.96(0.2), 4.84(0.1),

Physical Properties of Jahnsite-(CaMnFe)

Cleavage:

[001] Good

Color:

Brown, Purplish brown, Yellow, Yellow orange.

Density:

2.86

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

4 - Fluorite

Luster:

Vitreous - Adamantine

Streak:

white

Calculated Properties of Jahnsite-(CaMnFe)

Electron Density:

r_electron=2.93 gm/cc
note: r_{Jahnsite-(CaMnFe)}=2.95 gm/cc.

Fermion Index

Fermion Index = 0.00569
Boson Index = 0.99431

Photoelectric:

PE_{Jahnsite-(CaMnFe)}= 10.33 barns/electron
U=PE_{Jahnsite-(CaMnFe)} x r_electron= 30.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jahnsite-(CaMnFe) is Not Radioactive

Jahnsite-(CaMnFe) Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.2)Dana Group

42.11.2.1 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

42.11.2.2 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

42.11.2.3 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

42.11.2.4 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

Strunz Class:

VII/D.29-60 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.29 - Whiteite - Jahnsite group

VII/D.29-10 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2·8(H2O) P 2₁/a 2/m

VII/D.29-20 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-30 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-40 Rittmannite MnMnFeAl2(OH)2(PO4)4·8(H2O) P 2/a 2/m

VII/D.29-50 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-60 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-70 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-75 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2·8(H2O) P 2/a 2/m

VII/D.29-80 Keckite Ca(Mn,Zn)2Fe3(PO4)4(OH)3·2(H2O) P 2₁/a 2/m

Other Jahnsite-(CaMnFe) Information

References:

NAME( Dana8) PHYS. PROP.(Dana8)

See Also:

Links to other databases for Jahnsite-(CaMnFe) :
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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Print or Cut-and-Paste your Jahnsite-(CaMnFe) Specimen Label here :

Jahnsite-(CaMnFe)

CaMn++Fe++2Fe+++2(PO4)4(OH)2·8(H2O)
Dana No: 42.11.2.2 Strunz No: VII/D.29-60
Locality:

Notes: