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Davisite

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Formula:
CaScAlSiO6
Crystal System:
Monoclinic
Name:
Named for Andrew M. Davis (1950 - ), Professor of Cosmochemistry, University of Chicago, in honor of his outstanding contributions to meteorite research.
Pyroxene Group, Clinopyroxene Subgroup. The Sc analogue of burnettite (V), esseneite (Fe3+), grossmanite (Ti3+), and kushiroite (Al).

Unique combination of elements.

Likely a product of condensation/evaporation within the solar nebula.


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Classification of DavisiteHide

Approved
Approval Year:
2008
9.DA.15

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
65.1.3.7

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2

Chemical Properties of DavisiteHide

Formula:
CaScAlSiO6
Common Impurities:
Mg,Ti(III),Ti(IV)

Crystallography of DavisiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 9.884 Å, b = 8.988 Å, c = 5.446 Å
β = 105.86°
Ratio:
a:b:c = 1.1 : 1 : 0.606
Unit Cell V:
465.39 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.039 (100)
2.989 (33)
2.619 (39)
2.600 (28)
2.564 (47)
2.159 (16)
2.063 (22)
1.676 (16)

Type Occurrence of DavisiteHide

General Appearance of Type Material:
fine-grained aggregate with REE-rich perovskite; main phase in ultra-refractory domains within amoeboidal olivine
Associated Minerals at Type Locality:

Synonyms of DavisiteHide

Related Minerals - Nickel-Strunz GroupingHide

9.DA.ProtoenstatiteMg2Si2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
9.DA.05Donpeacorite(Mn2+,Mg)Mg[SiO3]2Orth.
9.DA.05EnstatiteMgSiO3Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.05FerrosiliteFeSiO3Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.10ClinoenstatiteMgSiO3Mon. 2/m : P21/b
9.DA.10ClinoferrosiliteFe2+SiO3Mon. 2/m : P21/b
9.DA.10KanoiteMn2+(Mg,Mn2+)Si2O6Mon. 2/m : P21/b
9.DA.10Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : P21/b
9.DA.15Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : B2/b
9.DA.15DiopsideCaMgSi2O6Mon. 2/m : B2/b
9.DA.15EsseneiteCaFe3+[AlSiO6]Mon. 2/m : B2/b
9.DA.15HedenbergiteCaFe2+Si2O6Mon. 2/m : B2/b
9.DA.15JohannseniteCaMn2+Si2O6Mon. 2/m : B2/b
9.DA.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6Mon.
9.DA.15KushiroiteCaAl[AlSiO6]Mon. 2/m : B2/b
9.DA.15GrossmaniteCaTi3+ AlSiO6Mon. 2/m : B2/b
9.DA.20Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6Mon. 2/m : B2/b
9.DA.20Omphacite(NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6Mon. 2/m
9.DA.25AegirineNaFe3+Si2O6Mon. 2/m : B2/b
9.DA.25JadeiteNa(Al,Fe3+)Si2O6Mon.
9.DA.25JervisiteNaSc3+Si2O6Mon.
9.DA.25KosmochlorNaCrSi2O6Mon.
9.DA.25NamansiliteNaMn3+Si2O6Mon.
9.DA.25NatalyiteNaV3+Si2O6Mon.
9.DA.30SpodumeneLiAlSi2O6Mon.

Related Minerals - Dana Grouping (8th Ed.)Hide

65.1.3.8KushiroiteCaAl[AlSiO6]Mon. 2/m : B2/b

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for DavisiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ma, C., Rossman, G.R. (2009) Davisite, CaScAlSiO6, a new pyroxene from the Allende meteorite. American Mineralogist 94, 845-848.

Internet Links for DavisiteHide

Localities for DavisiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Kazakhstan
 
  • Pavlodar
Ivanova, M. A., Krot, A. N., Nagashima, K. & MacPherson, G. J. (2012). Meteoritics & Planetary Science 47 (12): 2107-2127. (Dec 2012)
Mexico (TL)
 
  • Chihuahua
    • Pueblito de Allende
Am. Min. 94,845(2009); Ma, C., Paque, J., & Tschauner, O. (2016, March). Discovery of Beckettite, Ca2V6Al6O20, a New Alteration Mineral in a V-Rich Ca-Al-Rich Inclusion from Allende. In Lunar and Planetary Science Conference (Vol. 47, p. 1704).
Mineral and/or Locality  
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