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Davisite

A valid IMA mineral species

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Formula:

CaScAlSiO₆

Colour:

Light gray in thin-section

Crystal System:

Monoclinic

Member of:

Clinopyroxene Subgroup > Pyroxene Group

Name:

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

Type Locality:

ⓘ Allende meteorite, Pueblito de Allende, Chihuahua, Mexico

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.

Compare UM2004-50-SiO:AlFeGd.

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Unique IdentifiersHide

Mindat ID:

38829

Long-form identifier:

mindat:1:1:38829:6

GUID
(UUID V4):

9380daf3-77c6-4135-8028-fe76099fa8e9

IMA Classification of DavisiteHide

IMA status:

Approved

Approval year:

2008

First published:

2009

Classification of DavisiteHide

Strunz-mindat (2024):

9.DA.15

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

Dana 8th ed.:

65.1.3.7

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol	Source	Reference
Dav	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of DavisiteHide

Transparency:

Transparent

Colour:

Light gray in thin-section

Chemistry of DavisiteHide

Mindat Formula:

CaScAlSiO₆

Elements listed:

Al, Ca, O, Sc, Si - search for minerals with similar chemistry

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 Å³ (Calculated from Unit Cell)

Twinning:

None observed.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0014124	Davisite	Ohashi H, Ii N (1978) Structure of calcium scandium aluminum silicate (CaScAlSiO6)-pyroxene, Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists 73 267-273		1978	synthetic	0	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Davisite'
loop_
_publ_author_name
'Ohashi H'
'Ii N'
_journal_name_full 'Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists'
_journal_volume 73 
_journal_year 1978
_journal_page_first 267
_journal_page_last 273
_publ_section_title
;
 Structure of calcium scandium aluminum silicate (CaScAlSiO6)-pyroxene,
;
_database_code_amcsd 0014124
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Sc Ca (Al Si) O6'
_cell_length_a 9.884
_cell_length_b 8.988
_cell_length_c 5.446
_cell_angle_alpha 90
_cell_angle_beta 105.86
_cell_angle_gamma 90
_cell_volume 465.391
_exptl_crystal_density_diffrn      3.370
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
ScM1   0.00000   0.90431   0.25000   1.00000   0.00565
CaM2   0.00000   0.31236   0.25000   1.00000   0.00923
AlT   0.29057   0.09199   0.23218   0.50000   0.00479
SiT   0.29057   0.09199   0.23218   0.50000   0.00479
O1   0.11283   0.08975   0.13842   1.00000   0.00803
O2   0.36548   0.25503   0.33043   1.00000   0.00957
O3   0.35306   0.02108   0.99366   1.00000   0.00954
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
ScM1 0.00614 0.00528 0.00517 0.00000 0.00088 0.00000
CaM2 0.01218 0.00720 0.00644 0.00000 -0.00063 0.00000
AlT 0.00476 0.00503 0.00428 -0.00048 0.00071 -0.00021
SiT 0.00476 0.00503 0.00428 -0.00048 0.00071 -0.00021
O1 0.00962 0.00765 0.00672 0.00104 0.00204 0.00036
O2 0.01104 0.00872 0.00918 0.00212 0.00305 -0.00055
O3 0.00829 0.01072 0.00977 -0.00342 0.00280 0.00002

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
3.039 Å	(100)
2.989 Å	(33)
2.619 Å	(39)
2.600 Å	(28)
2.564 Å	(47)
2.159 Å	(16)
2.063 Å	(22)
1.676 Å	(16)

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 1: Primary nebular phases	4.567-4.561
3 : Solar nebular condensates (CAIs, AOAs, URIs)	>4.565

Type Occurrence of DavisiteHide

Type Locality:

ⓘ Allende meteorite, Pueblito de Allende, Chihuahua, Mexico

General Appearance of Type Material:

Fine-grained aggregate with REE-rich perovskite; main phase in ultra-refractory domains within amoeboidal olivine.

Place of Conservation of Type Material:

National Museum of Natural History, Washington D.C., USA, USNM 7555.

Geological Setting of Type Material:

Ultra-refractory inclusion in a meteorite.

Associated Minerals at Type Locality:

Spinel

Perovskite

Synonyms of DavisiteHide

IMA2008-030

Relationship of Davisite to other SpeciesHide

Member of:

Clinopyroxene Subgroup > Pyroxene Group

Other Members of this group:

Aegirine	NaFe³⁺Si₂O₆	Mon. 2/m : B2/b
Aegirine-augite	(Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆	Mon. 2/m : B2/b
Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆	Mon. 2/m : B2/b
Burnettite	CaVAlSiO₆	Mon. 2/m : B2/b
Clinoenstatite	MgSiO₃	Mon. 2/m : P2₁/b
Clinoferrosilite	Fe²⁺₂Si₂O₆	Mon. 2/m : P2₁/b
Colomeraite	NaTi³⁺Si₂O₆	Mon. 2/m : B2/b
Diopside	CaMgSi₂O₆	Mon. 2/m : B2/b
Esseneite	CaFe³⁺[AlSiO₆]	Mon. 2/m : B2/b
Grossmanite	CaTi³⁺ AlSiO₆	Mon. 2/m : B2/b
Hedenbergite	CaFe²⁺Si₂O₆	Mon. 2/m : B2/b
Jadeite	Na(Al,Fe³⁺)Si₂O₆	Mon. 2/m : B2/b
Jervisite	NaSc³⁺Si₂O₆	Mon. 2/m : B2/b
Johannsenite	CaMn²⁺Si₂O₆	Mon. 2/m : B2/b
Kanoite	Mn²⁺(Mg,Mn²⁺)Si₂O₆	Mon. 2/m : P2₁/b
Kosmochlor	NaCrSi₂O₆	Mon. 2/m : B2/b
Kushiroite	CaAl[AlSiO₆]	Mon. 2/m : B2/b
Namansilite	NaMn³⁺Si₂O₆	Mon. 2/m : B2/b
Natalyite	NaV³⁺Si₂O₆	Mon. 2/m : B2/b
Omphacite	(Na_aCa_bFe²⁺_cMg_d)(Al_eFe³⁺_fFe²⁺_gMg_h)Si₂O₆	Mon. 2/m
Petedunnite	Ca(Zn,Mn²⁺,Mg,Fe²⁺)Si₂O₆	Mon. 2/m : B2/b
Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆	Mon. 2/m : P2₁/b
Ryabchikovite	CuMgSi₂O₆	Mon. 2/m : P2₁/b
Spodumene	LiAlSi₂O₆	Mon. 2/m : B2/b
Tissintite	(Ca,Na,◻)AlSi₂O₆	Mon. 2/m : B2/b
UM2001-19-SiO:AlCaMgNa	(Na,Mg,Ca)(Mg,Al)Si₂O₆	Mon. 2/m : B2/b
UM2003-36-SiO:CaNa	NaCrSi₂O₆ - CaMgSi₂O₆	Mon. 2/m : B2/b

Related Minerals - Strunz-mindat Grouping Hide

9.DA.	Protoenstatite	Mg₂Si₂O₆	Orth. mmm (2/m 2/m 2/m) : Pbcn
9.DA.	Ryabchikovite	CuMgSi₂O₆	Mon. 2/m : P2₁/b
9.DA.	Colomeraite	NaTi³⁺Si₂O₆	Mon. 2/m : B2/b
9.DA.05	Donpeacorite	(Mn,Mg)MgSi₂O₆	Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.05	Enstatite	Mg₂Si₂O₆	Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.05	Ferrosilite	Fe²⁺₂Si₂O₆	Orth. mmm (2/m 2/m 2/m) : Pbca
9.DA.10	Clinoenstatite	MgSiO₃	Mon. 2/m : P2₁/b
9.DA.10	Clinoferrosilite	Fe²⁺₂Si₂O₆	Mon. 2/m : P2₁/b
9.DA.10	Kanoite	Mn²⁺(Mg,Mn²⁺)Si₂O₆	Mon. 2/m : P2₁/b
9.DA.10	Pigeonite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆	Mon. 2/m : P2₁/b
9.DA.15	Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)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 va	Jeffersonite	Ca(Mn,Zn,Fe)Si₂O₆
9.DA.15	Johannsenite	CaMn²⁺Si₂O₆	Mon. 2/m : B2/b
9.DA.15	Petedunnite	Ca(Zn,Mn²⁺,Mg,Fe²⁺)Si₂O₆	Mon. 2/m : B2/b
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	(Na_aCa_bFe²⁺_cMg_d)(Fe³⁺_eAl_fFe²⁺_gMg_h)Si₂O₆	Mon. 2/m : B2/b
9.DA.20	Omphacite	(Na_aCa_bFe²⁺_cMg_d)(Al_eFe³⁺_fFe²⁺_gMg_h)Si₂O₆	Mon. 2/m
9.DA.25	Aegirine	NaFe³⁺Si₂O₆	Mon. 2/m : B2/b
9.DA.25	Jadeite	Na(Al,Fe³⁺)Si₂O₆	Mon. 2/m : B2/b
9.DA.25	Jervisite	NaSc³⁺Si₂O₆	Mon. 2/m : B2/b
9.DA.25	Kosmochlor	NaCrSi₂O₆	Mon. 2/m : B2/b
9.DA.25	Namansilite	NaMn³⁺Si₂O₆	Mon. 2/m : B2/b
9.DA.25	Natalyite	NaV³⁺Si₂O₆	Mon. 2/m : B2/b
9.DA.25	Tissintite	(Ca,Na,◻)AlSi₂O₆	Mon. 2/m : B2/b
9.DA.30	Spodumene	LiAlSi₂O₆	Mon. 2/m : B2/b
9.DA.35	Hiroseite	FeSiO₃	Orth. mmm (2/m 2/m 2/m) : Pnma

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.

Internet Links for DavisiteHide

mindat.org URL:

https://www.mindat.org/min-38829.html
Please feel free to link to this page.

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External Links:

Look for Davisite on Webmineral

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for DavisiteHide

Reference List:

Ma, C., Rossman, G. R. (2009) Davisite, CaScAlSiO6, a new pyroxene from the Allende meteorite. American Mineralogist, 94 (5) 845-848 doi:10.2138/am.2009.3209

(2023) Davisite. Handbook of Mineralogy. Mineralogical Society of America

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.


Italy
Emilia-Romagna Ferrara Province Vigarano Mainarda Vigarano Pieve ⓘ Vigarano meteorite (Cariani; Ferrara; Mainardi; Morandi; Parish; Pieve; Vigarano Mainarda; Vigarano Pieve; Vigarno; Vigarvano; Vigavano [NHM cat.])	Ma et al. (2015) +1 other reference

Kazakhstan
Pavlodar Region Pavlodar District ⓘ Efremovka meteorite	Ivanova et al. (2012)

Mexico (TL)
Chihuahua Pueblito de Allende ⓘ Allende meteorite (TL)	Ma et al. (2009) +3 other references

Oman
Al Wusta Governorate Sayh al Uhaymir ⓘ Sayh al Uhaymir 290 meteorite	Zhang et al. (2015)