Davisite Mineral Data

[Mineral Auctions] [Register] [Current Auctions] [Log In] [www.danweinrich.com]
Dan Weinrich Auctions
Specializing In Live Weekly Auctions Of Top Quality Mineral Specimens
The Place To Find Great Specimens At Great Prices!

General Davisite Information

Chemical Formula:

Ca(Sc,Ti+++,Mg,Ti++++)AlSiO6

Composition:

Molecular Weight = 235.70 gm

Calcium 16.83 % Ca

Yttrium 0.38 % Y

Magnesium 1.65 % Mg

Zirconium 1.55 % Zr

Scandium 9.54 % Sc

Titanium 5.28 % Ti

Aluminum 11.10 % Al

Vanadium 0.43 % V

Iron 0.24 % Fe

Silicon 12.27 % Si

Oxygen 40.73 % O

______

100.00 %

Empirical Formula:

Ca_0.99Sc_0.5Ti_0.16Mg_0.16Ti_0.1Zr_0.04V³⁺_0.02Fe²⁺_0.01Y_0.01Si_1.03Al_0.97O₆

Environment:

Observed in an ultra-refractory inclusion. Pyroxene group.

IMA Status:

Approved IMA 2008 (Dana # Added)

Locality:

Allende meteorite, Pueblito de Allende, Chihuahua, Mexico Link to MinDat.org Location Data.

Name Origin:

Named for Andrew M. Davis (b 1950), Professor of Cosmochemistry at the University of Chicago, in honor of his outstanding contributions to meteorite research.

Synonym:

IMA2008-030

Davisite Image

Images:

Davisite

Comments: BSE image of the davisite-containing refractory inclusion in a polished section (USNM 7555). (AmMin, v94:845).
Location: Allende meteorite. Scale: See Image.
© American Mineralogist

Davisite Crystallography

Axial Ratios:

a:b:c =1.0996:1:0.6059

Cell Dimensions:

a = 9.884, b = 8.988, c = 5.446, Z = 4; beta = 105.86° V = 465.39 Den(Calc)= 3.36

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 3.039(1)(221), 2.564(0.47)(221), 2.619(0.4)(002),2.989(0.31)(310), 2.6(0.26)(131), 1.676(0.2)(223), 1.444(0.18)(531), 2.159(0.18)(331), 2.943(0.18)(311),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Ohashi H , Ii N , Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists , 73 (1978) p.267-273, Structure of calcium scandium aluminum silicate (CaScAlSiO6)-pyroxene,, Locality: synthetic

Physical Properties of Davisite

Diaphaneity:

Transparent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Luster:

Vitreous (Glassy)

Optical Properties of Davisite

Optical Data:

Biaxial (?)

Calculated Properties of Davisite

Electron Density:

Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Davisite =3.36 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Davisite= 7.75 barns/electron
U=PE_Davisite x rElectron Density= 25.55 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Davisite is Not Radioactive

Davisite Classification

Dana Class:

65.01.03a.07 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.01)with chains P=2

(65.01.03a)C2/c clinopyroxenes (Ca clinopyroxenes)

65.01.03a.01 Diopside CaMgSi2O6 C 2/c 2/m

65.01.03a.02 Hedenbergite CaFeSi2O6 C 2/c 2/m

65.01.03a.03 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

65.01.03a.04 Johannsenite CaMnSi2O6 C 2/c 2/m

65.01.03a.05 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

65.01.03a.06 Esseneite CaFeAlSiO6 C 2/c 2/m

65.01.03a.07 Davisite! Ca(Sc,Ti,Mg,Ti)AlSiO6 C 2/c 2/m

Strunz Class:

09.DA.15 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family

09.DA.15 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

09.DA.15 Esseneite CaFeAlSiO6 C 2/c 2/m

09.DA.15 Diopside CaMgSi2O6 C 2/c 2/m

09.DA.15 Johannsenite CaMnSi2O6 C 2/c 2/m

09.DA.15 Hedenbergite CaFeSi2O6 C 2/c 2/m

09.DA.15 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

09.DA.15 Davisite! Ca(Sc,Ti,Mg,Ti)AlSiO6 C 2/c 2/m

Other Davisite Information

References:

NAME( AmMin, v94:845) PHYS. PROP.(AmMin, v94:845) OPTIC PROP.(AmMin, v94:845)

See Also:

Links to other databases for Davisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Davisite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Davisite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Davisite Mineral Data :

Ask about Davisite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Davisite

Ca(Sc,Ti+++,Mg,Ti++++)AlSiO6
Dana No: 65.01.03a.07 Strunz No: 09.DA.15
Locality:

Notes: