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.
Unique combination of elements.
Likely a product of condensation/evaporation within the solar nebula.
Classification of Davisite
Approved
Approval Year:
2008
9.DA.15
9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
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
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Chemical Properties of Davisite
Formula:
CaScAlSiO6
Common Impurities:
Mg,Ti(III),Ti(IV)
Crystallography of Davisite
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°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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 Davisite
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 Davisite
Related Minerals - Nickel-Strunz Grouping
| 9.DA. | Protoenstatite | Mg2Si2O6 | Orth. mmm (2/m 2/m 2/m) : Pbcn |
| 9.DA.05 | Donpeacorite | (Mn2+,Mg)Mg[SiO3]2 | Orth. |
| 9.DA.05 | Enstatite | MgSiO3 | Orth. mmm (2/m 2/m 2/m) : Pbca |
| 9.DA.05 | Ferrosilite | FeSiO3 | Orth. mmm (2/m 2/m 2/m) : Pbca |
| 9.DA.10 | Clinoenstatite | MgSiO3 | Mon. 2/m : P21/b |
| 9.DA.10 | Clinoferrosilite | Fe2+SiO3 | Mon. 2/m : P21/b |
| 9.DA.10 | Kanoite | Mn2+(Mg,Mn2+)Si2O6 | Mon. 2/m : P21/b |
| 9.DA.10 | Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Mon. 2/m : P21/b |
| 9.DA.15 | Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 | Mon. 2/m : B2/b |
| 9.DA.15 | Diopside | CaMgSi2O6 | Mon. 2/m : B2/b |
| 9.DA.15 | Esseneite | CaFe3+[AlSiO6] | Mon. 2/m : B2/b |
| 9.DA.15 | Hedenbergite | CaFe2+Si2O6 | Mon. 2/m : B2/b |
| 9.DA.15 | Johannsenite | CaMn2+Si2O6 | Mon. 2/m : B2/b |
| 9.DA.15 | Petedunnite | Ca(Zn,Mn2+,Mg,Fe2+)Si2O6 | Mon. |
| 9.DA.15 | Kushiroite | CaAl[AlSiO6] | Mon. 2/m : B2/b |
| 9.DA.15 | Grossmanite | CaTi3+ AlSiO6 | Mon. 2/m : B2/b |
| 9.DA.20 | Aegirine-augite | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 | Mon. 2/m : B2/b |
| 9.DA.20 | Omphacite | (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6 | Mon. 2/m |
| 9.DA.25 | Aegirine | NaFe3+Si2O6 | Mon. 2/m : B2/b |
| 9.DA.25 | Jadeite | Na(Al,Fe3+)Si2O6 | Mon. |
| 9.DA.25 | Jervisite | NaSc3+Si2O6 | Mon. |
| 9.DA.25 | Kosmochlor | NaCrSi2O6 | Mon. |
| 9.DA.25 | Namansilite | NaMn3+Si2O6 | Mon. |
| 9.DA.25 | Natalyite | NaV3+Si2O6 | Mon. |
| 9.DA.30 | Spodumene | LiAlSi2O6 | Mon. |
Related Minerals - Dana Grouping (8th Ed.)
| 65.1.3.8 | Kushiroite | CaAl[AlSiO6] | Mon. 2/m : B2/b |
Other Information
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 Davisite
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 Davisite
mindat.org URL:
https://www.mindat.org/min-38829.html
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Please feel free to link to this page.
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Localities for Davisite
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Italy | |
| Ma, C., Krot, A.N., Beckett, J.R., Nagashima, K. and Tschauner, O. (2015) Discovery of warkite, Ca2Sc6Al6O20, a new Sc-rich ultra-refractory mineral in Murchinson and Vigarano. 78th Annual Meeting of the Meteoritical Society, volume 50, paper id. 5025; Ma, C., Yoshizaki, T., Krot, A.N., Beckett, J.R., Nakamura, T., Nagashima, K., Muto, J., and Ivanova, M.A. (2017) Discovery of rubinite, Ca3Ti3+2Si3O12, a new garnet mineral in refractory inclusions from carbonaceous chondrites. 80th Annual Meeting of the Meteoritical Society (LPI Contrib. No. 1987), paper id. 6023. |
Kazakhstan | |
| Ivanova, M. A., Krot, A. N., Nagashima, K. & MacPherson, G. J. (2012). Meteoritics & Planetary Science 47 (12): 2107-2127. (Dec 2012) |
Mexico (TL) | |
| 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). |