Jahnsite-(CaMnFe) Mineral Data (original) (raw)

General Jahnsite-(CaMnFe) Information

Help on Chemical Formula: Chemical Formula:

CaMn++Fe++2Fe+++2(PO4)4(OH)2•8(H2O)

Help on Composition: 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

Help on Empirical Formula: Empirical Formula:

CaMn2+Fe2+2Fe3+2(PO4)4(OH)2•8(H2O)

Help on IMA Status: IMA Status:

Approved IMA 1978

Help on Locality: Locality:

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

Help on Name Origin: Name Origin:

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

Help on Name Pronunciation: Name Pronunciation:

Jahnsite-(CaMnFe) Say JAHNSITE-(CAMNFE)

Jahnsite-(CaMnFe) Image

Click Here for Larger Jahnsite-(CaMnFe) Image in a New Browser Window Images:

Click Here for Larger Jahnsite-(CaMnFe) Image Jahnsite-(CaMnFe) Comments: Orange-brown microcrystalline jahnsite-(CaMnFe) associated with quartz. Location: Voron'i Tundry, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.Scale: See Image. © Rruff Database

Jahnsite-(CaMnFe) Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =2.0993:1:1.3804

Help on Cell Dimensions: Cell Dimensions:

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

Help on Crystal System: Crystal System:

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

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 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)

Help on Cleavage: Cleavage:

{001} Good

Help on Color: Color:

Brown, Purplish brown, Yellow, Yellow orange.

Help on Density: Density:

2.86

Help on Diaphaneity: Diaphaneity:

Transparent to Translucent

Help on Fracture: Fracture:

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

Help on Hardness: Hardness:

4 - Fluorite

Help on Luster: Luster:

Vitreous - Adamantine

Help on Streak: Streak:

white

Optical Properties of Jahnsite-(CaMnFe)

Help on Optical Data: Optical Data:

NCalc= 1.71 - from Gladstone-Dale relationship (KC = 0.2398) where Ncalc=Dcalc*KC+1
NCalc= 1.69 - from Gladstone-Dale relationship (KC = 0.2398) where Ncalc=Dmeas*KC+1

Calculated Properties of Jahnsite-(CaMnFe)

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.93 gm/cc
note: Specific Gravity of Jahnsite-(CaMnFe) =2.95 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.0056962282
Boson Index = 0.9943037718

Help on Photoelectric: Photoelectric:

PEJahnsite-(CaMnFe) = 10.33 barns/electron
U=PEJahnsite-(CaMnFe) x rElectron Density= 30.24 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Jahnsite-(CaMnFe) is Not Radioactive

Jahnsite-(CaMnFe) Classification

Help on Dana Class: Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq � x(H2O)

(42.11.02)Jahnsite Group

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

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

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

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

Help on Strunz Class: Strunz Class:

08.DH.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1

08.DH.15 Keckite Ca(Mn,Zn)2Fe3(PO4)4(OH)3•2(H2O) P 21/a 2/m

08.DH.15 Jahnsite-(CaMnFe) CaMnFe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m

08.DH.15 Jahnsite-(CaMnMg) CaMnMg2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m

08.DH.15 Jahnsite-(CaMnMn) CaMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m

08.DH.15 Jahnsite-(MnMnMn)* MnMnMn2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m

08.DH.15 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)•4(H2O) C cca 2/m 2/m 2/m

08.DH.15 Rittmannite MnMnFeAl2(OH)2(PO4)4•8(H2O) P 2/a 2/m

08.DH.15 Whiteite-(MnFeMg) (Mn,Ca)(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m

08.DH.15 Whiteite-(CaFeMg) Ca(Fe,Mn)Mg2Al2(PO4)4(OH)2•8(H2O) P 21/a 2/m

08.DH.15 Whiteite-(CaMnMg) CaMnMg2Al2(PO4)4(OH)2•8(H2O) P 2/a 2/m

08.DH.15 Jahnsite-(CaFeFe)! (Ca,Mn)(Fe,Mn)Fe2Fe2(PO4)4(OH)2•8(H2O) P 2/a 2/m

08.DH.15 Jahnsite-(NaFeMg)! NaFeMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m

08.DH.15 Jahnsite-(CaMgMg)! CaMgMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m

08.DH.15 Jahnsite-(NaMnMg)! NaMnMg2Fe2(PO4)4(OH)2•8H2O P 2/a 2/m

Other Jahnsite-(CaMnFe) Information

Help on References: References:

NAME( Dana8) PHYS. PROP.(Dana8)

Help on See Also: See Also:

Links to other databases for Jahnsite-(CaMnFe) :
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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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: 42.11.02.02 Strunz No: 08.DH.15
Locality:

Notes: