Mineralogy Database

Tungusite Mineral Data

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General Tungusite Information

Help on Chemical  Formula: Chemical Formula: [Ca14(OH)8](Si8020)(Si8020)2[Fe++9(OH)14]
Help on Composition: Composition: Molecular Weight = 761.15 gm
   Sodium      1.45 %  Na    1.95 % Na2O
   Calcium    18.22 %  Ca   25.49 % CaO
   Magnesium   0.67 %  Mg    1.11 % MgO
   Manganese   1.01 %  Mn    1.30 % MnO
   Aluminum    1.52 %  Al    2.88 % Al2O3
   Iron       10.27 %  Fe   11.61 % FeO /  1.78 % Fe2O3
   Silicon    21.92 %  Si   46.89 % SiO2
   Hydrogen    0.79 %  H     7.10 % H2O
   Oxygen     44.14 %  O
             ______        ______ 
             100.00 %      100.13 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca3.46Na0.48Mn2+0.06Fe2+1.23Al0.37Mg0.21Fe3+0.17Mn2+0.08Si5.94Al0.06O15(OH)6
Help on Environment: Environment: A secondary mineral forming crusts lining cavities and amygdules in hydrothermally altered basalts.
Help on IMA Status: IMA Status: Approved IMA 1966
Help on Locality: Locality: Found along the Lower Tunguska River, near Tura, central Siberia, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Tungusite + Pronunciation Say TUNGUSITE

Tungusite Image

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Comments: Green to white platy tungusite rosettes.
Location: Nizhnyaya Tunguska River, near Tura, Evenkia, Krasnoyarsk Territory, Siberia, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Tungusite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9992:1:2.2724
Help on Cell Dimensions: Cell Dimensions: a = 9.714, b = 9.721, c = 22.09, Z = 3; alpha = 90.13°, beta = 98.3°, gamma = 129° V = 1,604.11 Den(Calc)= 2.36
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): 1.818(1), 3.12(0.8), 4.17(0.8),

Physical Properties of Tungusite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Grass green, Yellow green.
Help on Density: Density: 2.59
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Flakes - Flat, thin crystals or aggregates.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Pearly
Help on Streak: Streak: light green

Optical Properties of Tungusite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.134 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2462,KPDmeas= 0.2263,KC= 0.2171
Ncalc = 1.52 - 1.56
Help on Optical Data: Optical Data: Uniaxial (-), w=1.586.

Calculated Properties of Tungusite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Tungusite =2.59 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PETungusite = 6.42 barns/electron
U=PETungusite x rElectron Density= 16.59 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tungusite is Not Radioactive

Tungusite Classification

Help on  Dana Class: Dana Class: (78)Unclassified silicates
  (78.05)possible phyllosilicates
  (78.05.09)Dana Group Tungusite [Ca14(OH)8](Si8020)(Si8020)2[Fe9(OH)14] P1 1
Help on  Strunz Class: Strunz Class: 09.EE.30 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EE -Single tetrahedral nets of 6-membered rings
09.EE.30 Gyrolite NaCa16Si23AlO60(OH)8•64(H2O) P 61 6
09.EE.30 Tungusite [Ca14(OH)8](Si8020)(Si8020)2[Fe9(OH)14] P1 1

Other Tungusite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Tungusite :
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.EE.30





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