Jahnsite-(CaFeFe) Mineral Data

Jahnsite-(CaFeFe) Mineral Data +

General Jahnsite-(CaFeFe) Information

Chemical Formula:

(Ca,Mn)(Fe++,Mn++)Fe++2Fe+++2(PO4)4(OH)2·8(H2O)

Composition:

Molecular Weight = 851.41 gm

Calcium 2.82 % Ca 3.95 % CaO

Magnesium 2.28 % Mg 3.79 % MgO

Manganese 3.87 % Mn 5.00 % MnO

Aluminum 0.32 % Al 0.60 % Al₂O₃

Iron 24.93 % Fe 16.03 % FeO / 17.82 % Fe₂O₃

Phosphorus 14.55 % P 33.34 % P₂O₅

Hydrogen 2.37 % H 21.16 % H₂O

Oxygen 48.86 % O

______ ______

100.00 % 101.69 % = TOTAL OXIDE

Empirical Formula:

Ca_0.6Mn²⁺_0.6Fe²⁺_1.9Mg_0.8Fe³⁺_1.9Al_0.1(PO₄)₄·10(H₂O)

Environment:

Pliocene-Pleistocene clay deposits in vivianite nodules and secondary phosphates.

IMA Status:

Not Approved IMA

Locality:

Hime-Shima, Oita Prefecute and Kobe, Hyogo Prefecture, western Japan. 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.

Search for Jahnsite-(CaFeFe) Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Jahnsite-(CaFeFe) Crystallography

Axial Ratios:

a:b:c =2.0849:1:1.3802

Cell Dimensions:

a = 14.97, b = 7.18, c = 9.91, Z = 2; beta = 110.5° V = 997.72 Den(Calc)= 2.83

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): 9.28(1)(001), 4.642(0.5)(002), 2.834(0.35)(302),1.947(0.15)(024,405), 3.091(0.12)(412), 5.017(0.12)(210),

Physical Properties of Jahnsite-(CaFeFe)

Color:

Dark brown.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

4 - Fluorite

Luster:

Vitreous - Adamantine

Calculated Properties of Jahnsite-(CaFeFe)

Electron Density:

r_electron=2.82 gm/cc
note: r_{Jahnsite-(CaFeFe)}=2.83 gm/cc.

Fermion Index

Fermion Index = 0.00784
Boson Index = 0.99216

Photoelectric:

PE_{Jahnsite-(CaFeFe)}= 9.39 barns/electron
U=PE_{Jahnsite-(CaFeFe)} x r_electron= 26.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Jahnsite-(CaFeFe) is Not Radioactive

Jahnsite-(CaFeFe) Classification

Dana Class:

37.0.0.0 (37)Phosphate Minerals

(37.0)Without Dana Classification Numbers

(Whiteite Group)

Strunz Class:

VII/X.00-00 VII - Phosphates, Arsenates and Vanadates

VII/X - Unclassified Strunz Phosphates, Arsenates and Vanadates

VII/X.00 - Whiteite Group

Other Jahnsite-(CaFeFe) Information

References:

NAME( AmMin, Vol 86, p 1114) PHYS. PROP.(AmMin, Vol 86, p 1114)

See Also:

Links to other databases for Jahnsite-(CaFeFe) :
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

Search for Jahnsite-(CaFeFe) using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Jahnsite-(CaFeFe) :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Jahnsite-(CaFeFe) Mineral Data :

Ask about Jahnsite-(CaFeFe) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Jahnsite-(CaFeFe) Specimen Label here :

Jahnsite-(CaFeFe)

(Ca,Mn)(Fe++,Mn++)Fe++2Fe+++2(PO4)4(OH)2·8(H2O)
Dana No: Unknown Strunz No: VII/X.00-00
Locality:

Notes: