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Davisite Mineral Data

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General Davisite Information

Help on Chemical  Formula: Chemical Formula: Ca(Sc,Ti+++,Mg,Ti++++)AlSiO6
Help on Composition: 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 % 
Help on Empirical Formula: Empirical Formula: Ca0.99Sc0.5Ti0.16Mg0.16Ti0.1Zr0.04V3+0.02Fe2+0.01Y0.01Si1.03Al0.97O6
Help on Environment: Environment: Observed in an ultra-refractory inclusion. Pyroxene group.
Help on IMA Status: IMA Status: Approved IMA 2008 (Dana # Added)
Help on Locality: Locality: Allende meteorite, Pueblito de Allende, Chihuahua, Mexico Link to MinDat.org Location Data.
Help on Name Origin: 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.
Help on Synonym: Synonym: IMA2008-030

Davisite Image

Click Here for Larger   Image in a New Browser Window Images:
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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

Help on Axial Ratios: Axial Ratios: a:b:c =1.0996:1:0.6059
Help on Cell Dimensions: Cell Dimensions: a = 9.884, b = 8.988, c = 5.446, Z = 4; beta = 105.86° V = 465.39 Den(Calc)= 3.36
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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),

Physical Properties of Davisite

Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Davisite

Help on Optical Data: Optical Data: Biaxial (?)

Calculated Properties of Davisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.30 gm/cc
note: Specific Gravity of Davisite =3.36 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEDavisite = 7.75 barns/electron
U=PEDavisite x rElectron Density= 25.55 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Davisite is Not Radioactive

Davisite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( AmMin, v94:845) PHYS. PROP.(AmMin, v94:845) OPTIC PROP.(AmMin, v94:845)
Help on See Also: See Also: Links to other databases for Davisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 65.01.03a.07 Strunz No: 09.DA.15





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