Davanite Mineral Data

Davanite Mineral Data +

General Davanite Information

Chemical Formula:

K2TiSi6O15

Composition:

Molecular Weight = 534.58 gm

Potassium 14.63 % K 17.62 % K₂O

Titanium 8.96 % Ti 14.94 % TiO₂

Silicon 31.52 % Si 67.44 % SiO₂

Oxygen 44.89 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₂TiSi₆O₁₅

IMA Status:

Approved IMA 1984

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 46012

PDF 40-483

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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)= 2.69

Crystal System:

Triclinic - PinacoidalH-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),

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

Cleavage:

None

Color:

Colorless.

Density:

2.76

Diaphaniety:

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

Gladstone-Dale:

CI meas= -0.052 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.079 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.252,KPDmeas= 0.2457,KC= 0.2335

Optical Data:

Biaxial (-), a=1.66, b=1.684, g=1.69, bire=0.0300

Calculated Properties of Davanite

Electron Density:

r_electron=2.73 gm/cc
note: r_Davanite=2.76 gm/cc.

Fermion Index

Fermion Index = 0.02653
Boson Index = 0.97347

Photoelectric:

PE_Davanite= 4.13 barns/electron
U=PE_Davanite x r_electron= 11.25 barns/cc.

Radioactivity:

GRapi = 208.45 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Davanite - barely detectable

Davanite Classification

Dana Class:

72.2.1.2 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.2)with 4-, 6-, and 8-membered rings

(72.2.1)Dalylite group

72.2.1.1 Dalyite K2ZrSi6O15 P1 1

72.2.1.2 Davanite K2TiSi6O15 P1 1

72.2.1.3 Sazhinite-(Ce) Na2Ce[Si6O14(OH)]·n(H2O),(n>=1.5) Pmm2 mm2

72.2.1.4 IMA2002-042a! Na3La[Si6O15]·2(H2O) Pmm2 2/m 2/m 2/m

Strunz Class:

VIII/H.03-10 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.03 - Sanbornite series

VIII/H.03-10 Davanite K2TiSi6O15 P1 1

VIII/H.03-20 Dalyite K2ZrSi6O15 P1 1

Other Davanite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Davanite Specimen Label here :

Davanite

K2TiSi6O15
Dana No: 72.2.1.2 Strunz No: VIII/H.03-10
Locality:

Notes: