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Johninnesite Mineral Data

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General Johninnesite Information

Help on Chemical  Formula: Chemical Formula: Na2Mg4Mn++12(AsO4)2(Si12O35)(OH)6
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na2Mg4Mn2+12(AsO4)2Si12O35(OH)6
Help on Environment: Environment: In low temperature hydrothermal veins cutting metamophosed Fe-Mn ores.
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: 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.
Help on Name Origin: Name Origin: Named for John Innes, mineralogist of the Tsumeb Corporation, for his contributions to the mineralogy of the Tsumeb and Kombat mines.
Help on Name Pronunciation: Name Pronunciation: Johninnesite + Pronunciation Say JOHNINNESITE
Help on Synonym: Synonym: ICSD 75306
  PDF 39-402

Johninnesite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.9435:1:0.8694
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.676(1), 3.23(0.6), 9.8(0.6),

Physical Properties of Johninnesite

Help on Cleavage: Cleavage: {100} Good, {010} Poor
Help on Color: Color: Yellow brown.
Help on Density: Density: 3.48
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Plumose - "Mica-like" minerals forming aggregates of plume-like forms.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brownish yellow

Optical Properties of Johninnesite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1972,KPDmeas= 0.1984,KC= 0.2007
Ncalc = 1.7
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.35 gm/cc
note: Specific Gravity of Johninnesite =3.48 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEJohninnesite = 13.75 barns/electron
U=PEJohninnesite x rElectron Density= 46.11 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Johninnesite is Not Radioactive

Johninnesite Classification

Help on  Dana Class: Dana Class: (69)Inosilicate Chains with Side Branches or Loops
  (69.02)with P>2
  (69.02.05)Dana Group Johninnesite Na2Mg4Mn12(AsO4)2(Si12O35)(OH)6 P1 1
Help on  Strunz Class: Strunz Class: 09.DH.70 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DH -Inosilicates with 4-periodic single chains, Si4O12
09.DH.70 Johninnesite Na2Mg4Mn12(AsO4)2(Si12O35)(OH)6 P1 1

Other Johninnesite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Johninnesite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.DH.70





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