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

General Jahnsite-(MnMnMn) Information

Help on Chemical Formula: Chemical Formula:

MnMnMn2Fe+++2(PO4)4(OH)2•8(H2O)

Help on Composition: Composition:

Molecular Weight = 889.47 gm

Manganese 24.71 % Mn 31.90 % MnO

Iron 12.56 % Fe 17.95 % Fe2O3

Phosphorus 13.93 % P 31.92 % P2O5

Hydrogen 2.04 % H 18.23 % H2O

Oxygen 46.77 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Mn2+Mn2+Mn2+2Fe3+2(PO4)4(OH)2•8(H2O)

Help on IMA Status: IMA Status:

Not Approved IMA 1990

Help on Locality: Locality:

Stewart mine, Pala, San Diego County, California, 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-(MnMnMn) Say JAHNSITE-(MNMNMN)

Jahnsite-(MnMnMn) Image

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Jahnsite-(MnMnMn) Crystallography

Help on Axial Ratios: Axial Ratios:

a:b:c =2.0774:1:2.5933

Help on Cell Dimensions: Cell Dimensions:

a = 15.02, b = 7.23, c = 18.75, Z = 4; beta = 100.42° V = 2,002.57 Den(Calc)= 2.95

Help on Crystal System: Crystal System:

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

Physical Properties of Jahnsite-(MnMnMn)

Help on Cleavage: Cleavage:

None

Help on Color: Color:

Brown, Purplish brown, Yellow, Yellow orange.

Help on Diaphaneity: Diaphaneity:

Transparent to Translucent

Help on Hardness: Hardness:

4 - Fluorite

Help on Luster: Luster:

Vitreous - Adamantine

Help on Streak: Streak:

white

Optical Properties of Jahnsite-(MnMnMn)

Help on Gladstone-Dale: Gladstone-Dale:

CI calc= 0.018 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2355,KC= 0.2398
Ncalc = 1.71

Help on Optical Data: Optical Data:

Biaxial (-), a=1.682, b=1.695, g=1.707, bire=0.0250

Calculated Properties of Jahnsite-(MnMnMn)

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Jahnsite-(MnMnMn) =2.95 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.0028897106
Boson Index = 0.9971102894

Help on Photoelectric: Photoelectric:

PEJahnsite-(MnMnMn) = 10.64 barns/electron
U=PEJahnsite-(MnMnMn) x rElectron Density= 30.90 barns/cc.

Help on Radioactivity: Radioactivity:

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

Jahnsite-(MnMnMn) Classification

Help on Dana Class: Dana Class:

42.11.02.04 (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-(MnMnMn) Information

Help on References: References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

Help on See Also: See Also:

Links to other databases for Jahnsite-(MnMnMn) :
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-(MnMnMn) Specimen Label here :

Jahnsite-(MnMnMn)

MnMnMn2Fe+++2(PO4)4(OH)2•8(H2O)
Dana No: 42.11.02.04 Strunz No: 08.DH.15
Locality:

Notes: