Johninnesite Mineral Data

Johninnesite Mineral Data +

[Express Minerals] [Minerals for Sale] [About Us] [En EspaÃƒï¿½Ã‚Â±ol] [Mineral Gallery]
Fabre Minerals - Europe's first Internet mineral dealer, on the web since 1996

General Johninnesite Information

Chemical Formula:

Na2Mg4Mn++12(AsO4)2(Si12O35)(OH)6

Composition:

Molecular Weight = 2,079.34 gm

Sodium 2.21 % Na 2.98 % Na₂O

Magnesium 4.68 % Mg 7.75 % MgO

Manganese 31.71 % Mn 40.94 % MnO

Silicon 16.21 % Si 34.67 % SiO₂

Arsenic 7.21 % As 11.05 % As₂O₅

Hydrogen 0.29 % H 2.60 % H₂O

Oxygen 37.70 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Mg₄Mn²⁺₁₂(AsO₄)₂Si₁₂O₃₅(OH)₆

Environment:

In low temperature hydrothermal veins cutting metamophosed Fe-Mn ores.

IMA Status:

Approved IMA 1986

Locality:

Kombat mine, located 37 km east of Otavi and 49 km south of Tsumeb in the north-central part of Namibia. Link to MinDat.org Location Data.

Name Origin:

Named for John Innes, mineralogist of the Tsumeb Corporation, for his contributions to the mineralogy of the Tsumeb and Kombat mines.

Synonym:

ICSD 75306

PDF 39-402

Johninnesite Image

Images:

Johninnesite

Comments: Orange crystalline vein of johninnesite in manganese oxide matrix.
Location: Ausserferrera, Val Ferrera, Graubundun, Switzerland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Johninnesite Crystallography

Axial Ratios:

a:b:c =0.9435:1:0.8694

Cell Dimensions:

a = 10.44, b = 11.065, c = 9.62, Z = 1; alpha = 107.43°, beta = 82.7°, gamma = 111.6° V = 977.82 Den(Calc)= 3.53

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.676(1), 3.23(0.6), 9.8(0.6),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Grice J D , Dunn P J , American Mineralogist , 79 (1994) p.991-995, Johninnesite: Crystal-structure determination and its relationship to other, arsenosilicates

Physical Properties of Johninnesite

Cleavage:

[100] Good, [010] Poor

Color:

Yellow brown.

Density:

3.48

Diaphaniety:

Transparent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Fibrous - Crystals made up of fibers.

Habit:

Plumose - "Mica-like" minerals forming aggregates of plume-like forms.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous (Glassy)

Streak:

brownish yellow

Optical Properties of Johninnesite

Gladstone-Dale:

CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1956,KPDmeas= 0.1984,KC= 0.2007

Optical Data:

Biaxial (-), a=1.6742, b=1.6968, g=1.6999, bire=0.0257, 2V(Calc)=40, 2V(Meas)=41.9. Dispersion r > v distinct.

Calculated Properties of Johninnesite

Electron Density:

r_electron=3.35 gm/cc
note: r_Johninnesite=3.48 gm/cc.

Fermion Index

Fermion Index = 0.01242
Boson Index = 0.98758

Photoelectric:

PE_Johninnesite= 13.75 barns/electron
U=PE_Johninnesite x r_electron= 46.11 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Johninnesite is Not Radioactive

Johninnesite Classification

Dana Class:

69.2.5.1 (69)Inosilicate Chains with Side Branches or Loops

(69.2)with P>2

(69.2.5)Dana Group

69.2.5.1 Johninnesite Na2Mg4Mn12(AsO4)2(Si12O35)(OH)6 P1 1

Strunz Class:

VIII/F.16-40 VIII - Silicates

VIII/F - Inosilicates (chain and band) modified double chains

VIII/F.16 - Deerite - Taneyamalite series

VIII/F.16-10 Deerite (Fe,Mn)6(Fe,Al)3Si6O20(OH)5 P 2₁/a 2/m

VIII/F.16-20 Howieite Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13 P1,P1 Tri

VIII/F.16-30 Taneyamalite (Na,Ca)(Mn,Mg)12[(Si,Al)6O17]2(O,OH)10 P1 1

VIII/F.16-40 Johninnesite Na2Mg4Mn12(AsO4)2(Si12O35)(OH)6 P1 1

Other Johninnesite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

Search for Johninnesite using:

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

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

Translate Johninnesite Mineral Data :

Ask about Johninnesite 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 Johninnesite Specimen Label here :

Johninnesite

Na2Mg4Mn++12(AsO4)2(Si12O35)(OH)6
Dana No: 69.2.5.1 Strunz No: VIII/F.16-40
Locality:

Notes: