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:

K_1.98Ti_1.01Si_6.01O_15.03

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

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

By Intensity(I/I_o): 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:

PE_Davanite= 4.27 barns/electron
U=PE_Davanite 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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