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 % 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

Empirical Formula:

Ca_3.46Na_0.48Mn²⁺_0.06Fe²⁺_1.23Al_0.37Mg_0.21Fe³⁺_0.17Mn²⁺_0.08Si_5.94Al_0.06O₁₅(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

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

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

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

By Intensity(I/I_o): 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:

PE_Tungusite= 6.42 barns/electron
U=PE_Tungusite x rElectron 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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Print or Cut-and-Paste your Tungusite Specimen Label here :

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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