Davanite Mineral Data
General Davanite Information
Chemical Formula:
K2TiSi6O15
Composition:
Molecular Weight = 450.78 gm
Potassium 14.47 % K
Titanium 9.04 % Ti
Silicon 31.55 % Si
Oxygen 44.94 % O
______
100.00 %
Empirical Formula:
K1.98 Ti1.01 Si6.01 O15.03
Environment:
Found in contact metamorphic rocks in an alkalic massif (Murun massif, Russia); of magmatic origin, lining vugs in lamproites (Smoky Butte, Montana, USA).
IMA Status:
Approved IMA 1984
Locality:
Murun massif, Russia. Link to MinDat.org Location Data.
Name Origin:
Named for the Davan Stream near the locality.
Name Pronunciation:
Davanite
Synonym:
ICSD 46012
PDF 40-483
Davanite Image
Images:
Davanite
Comments: B&W plane-polarized light (PPL) image of davanite crystals, with a hexagonal outline, in a Sr-Ca carbonate matrix. (AmMin, v71:1473).
Location: Lamproites at Smoky Butte, Montana, USA.
Scale: Scale Bar 20 µm.
© American Mineralogist
Davanite Crystallography
Axial Ratios:
a:b:c =0.9667:1:0.9214
Cell Dimensions:
a = 7.26, b = 7.51, c = 6.92, Z = 1; alpha = 105.6°, beta = 112.9°, gamma = 99.4° V = 330.26 Den(Calc)= 2.27
Crystal System:
Triclinic - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 3.022(1), 3.51(1), 2.615(0.9),
Physical Properties of Davanite
Cleavage:
None
Color:
Colorless.
Density:
2.76
Diaphaneity:
Transparent
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Davanite
Optical Data:
Biaxial (-), a=1.66, b=1.684, g=1.69, bire=0.0300
Calculated Properties of Davanite
Electron Density:
Bulk Density (Electron Density)=2.32 gm/cc note: Specific Gravity of Davanite =2.35 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEDavanite = 4.27 barns/electronU=PEDavanite x r electron = 9.90 barns/cc.
Radioactivity:
GRapi = 244.32 (Gamma Ray American Petroleum Institute Units)
Concentration of Davanite per GRapi unit = 0.41 (%)
Estimated Radioactivity from Davanite - barely detectable
Davanite Classification
Dana Class:
72.02.01.02 (72) Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
(72.02) with 4-, 6-, and 8-membered rings
(72.02.01) Dalylite group
72.02.01.01 Dalyite K2ZrSi6O15 P1 1
72.02.01.02 Davanite K2TiSi6O15 P1 1
72.02.01.03 Sazhinite-(Ce) Na2Ce[Si6O14(OH)]•n(H2O),(n>=1.5) Pmm2 mm2
72.02.01.04 Sazhinite-(La) ! Na3La[Si6O15]•2(H2O) Pmm2 2/m 2/m 2/m
Strunz Class:
09.EA.25 09 - SILICATES (Germanates)
09.E - Phyllosilicates
09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
09.EA.25 Dalyite K2ZrSi6O15 P1 1
09.EA.25 Davanite K2TiSi6O15 P1 1
Other Davanite 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 Davanite :
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 Davanite Specimen Label here :
Davanite
K2TiSi6O15
Dana No: 72.02.01.02 Strunz No: 09.EA.25
Locality:
Notes:
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