Davanite Mineral Data

Davanite Mineral Data
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General Davanite Information

Help on Chemical Formula: Chemical Formula: K2TiSi6O15
Help on Composition: Composition: Molecular Weight = 450.78 gm
   Potassium  17.17 %  K
   Titanium   10.73 %  Ti
   Silicon    18.75 %  Si
   Oxygen     53.35 %  O
             ______ 
             100.00 % 
Help on Empirical Formula: Empirical Formula: K1.98Ti1.01Si3.01O15.03
Help on Environment: Environment: Found in contact metamorphic rocks in an alkalic massif (Murun massif, Russia); of magmatic origin, lining vugs in lamproites (Smoky Butte, Montana, USA).
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Murun massif, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Davan Stream near the locality.
Help on Name Pronunciation: Name Pronunciation: Davanite Say DAVANITE
Help on Synonym: Synonym: ICSD 46012
  PDF 40-483
 

Davanite Image

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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
Help on Axial Ratios: Axial Ratios: a:b:c =0.9667:1:0.9214
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.022(1), 3.51(1), 2.615(0.9),
Click Here for Large Davanite Structure Window Crystal Structure:

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Gebert W , Medenbach O , Florke O W , Tschermaks Mineralogische und Petrographische Mitteilungen , 31 (1983) p.69-79, Darstellung und kristallographie von K2TiSi6O15 - isotyp mit dalyit K2ZrSi6O15, Locality: synthetic

 

Physical Properties of Davanite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 2.76
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Davanite

Help on Optical Data: Optical Data: Biaxial (-), a=1.66, b=1.684, g=1.69, bire=0.0300
 

Calculated Properties of Davanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.32 gm/cc
note: Specific Gravity of Davanite =2.35 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEDavanite = 4.27 barns/electron
U=PEDavanite x relectron= 9.90 barns/cc.
Help on Radioactivity: 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
Help on Dana Class: 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
Help on Strunz Class: 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
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 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: