Tungusite Mineral Data
General Tungusite Information
Chemical Formula:
[Ca14(OH)8](Si8020)(Si8020)2[Fe++9(OH)14]
Composition:
Molecular Weight = 761.15 gm
Sodium 1.45 % Na 1.95 % Na2 O
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 % Al2 O3
Iron 10.27 % Fe 11.61 % FeO / 1.78 % Fe2 O3
Silicon 21.92 % Si 46.89 % SiO2
Hydrogen 0.79 % H 7.10 % H2 O
Oxygen 44.14 % O
______ ______
100.00 % 100.13 % = TOTAL OXIDE
Empirical Formula:
Ca3.46 Na0.48 Mn2+ 0.06 Fe2+ 1.23 Al0.37 Mg0.21 Fe3+ 0.17 Mn2+ 0.08 Si5.94 Al0.06 O15 (OH)6
Environment:
A secondary mineral forming crusts lining cavities and amygdules in hydrothermally altered basalts.
IMA Status:
Approved IMA 1966
Locality:
Found along the Lower Tunguska River, near Tura, central Siberia, Russia. Link to MinDat.org Location Data.
Name Origin:
Named for the locality.
Name Pronunciation:
Tungusite + Pronunciation
Tungusite Image
Images:
Tungusite Crystallography
Axial Ratios:
a:b:c =0.9992:1:2.2724
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
Crystal System:
Triclinic - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 1.818(1), 3.12(0.8), 4.17(0.8),
Physical Properties of Tungusite
Cleavage:
{001} Perfect
Color:
Grass green, Yellow green.
Density:
2.59
Diaphaneity:
Transparent to Translucent
Fracture:
Flexible - Flexible fragments.
Habit:
Flakes - Flat, thin crystals or aggregates.
Hardness:
2 - Gypsum
Luster:
Pearly
Streak:
light green
Optical Properties of Tungusite
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
Optical Data:
Uniaxial (-), w=1.586.
Calculated Properties of Tungusite
Electron Density:
Bulk Density (Electron Density)=2.58 gm/cc note: Specific Gravity of Tungusite =2.59 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PETungusite = 6.42 barns/electronU=PETungusite x r Electron Density= 16.59 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tungusite is Not Radioactive
Tungusite Classification
Dana Class:
78.05.09.01 (78) Unclassified silicates
(78.05) possible phyllosilicates
(78.05.09) Dana Group
78.05.09.01 Tungusite [Ca14(OH)8](Si8020)(Si8020)2[Fe9(OH)14] P1 1
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
References:
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
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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Tungusite
[Ca14(OH)8](Si8020)(Si8020)2[Fe++9(OH)14]
Dana No: 78.05.09.01 Strunz No: 09.EE.30
Locality:
Notes:
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