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Warkite

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Formula:
Ca2Sc6Al6O20
Ca2(Sc,Ti3+,Al,Mg,Zr)6Al6O20
Crystal System:
Triclinic
Name:
Named in 2013 by C. Ma, A.N. Krot, K. Nagashima and O. Tschauner in honor of David Wark (27 June 1939, Melbourne, Australia - 8 June 2005, Australia) for his many contributions to research on Ca-Al-rich inclusions in meteorites, including the discovery of the Wark-Lovering rims that surround inclusion bodies in meteorites.
The Sc analogue of addibischoffite and beckettite. Second Ca-Al-Sc mineral after davisite.

An ultra-refractory, early Sc phase, formed in reducing conditions. Found in Murchison and Vigarano meteorites. One of a few recently described Sc-rich meteoritic minerals, among allendeite, davisite, kangite, and panguite.


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Classification of WarkiteHide

Approved
Approval Year:
2013

Chemical Properties of WarkiteHide

Formula:
Ca2Sc6Al6O20

Ca2(Sc,Ti3+,Al,Mg,Zr)6Al6O20
Common Impurities:
Ti(III)

Crystallography of WarkiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Setting:
P1
Cell Parameters:
a = 10.367 Å, b = 10.756 Å, c = 8.895 Å
α = 105.98°, β = 96.04°, γ = 124.72°
Ratio:
a:b:c = 0.964 : 1 : 0.827
Unit Cell V:
739.41 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.067(53)
8.063(51)
4.802(55)
2.684(74)
2.684(72)
2.544(100)
2.541(78)
2.540(77)
Comments:
From Type Description.

Type Occurrence of WarkiteHide

General Appearance of Type Material:
4-12 μm aggregates of 1-4 μm crystals
Place of Conservation of Type Material:
Type material is deposited in the collections of the Field Museum, Chicago, Illinois, USA (Murchison) and the Smithsonian Institution’s National Museum of Natural History, Washington DC, USA, registration number USNM 7618 (Vigarano)
Geological Setting of Type Material:
Chondrite meteorites
Associated Minerals at Type Locality:

Synonyms of WarkiteHide

Relationship of Warkite to other SpeciesHide

Other Members of this group:
AddibischoffiteCa2Al6Al6O20Tric. 1 : P1
Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4Mon. 2/m : P21/b
SapphirineMg4(Mg3Al9)O4[Si3Al9O36]Mon. 2/m : P21/b
Unnamed (Al-analogue of Sapphirine)Mg4(Mg1.5Fe+20.3Fe+31.6Al8.5)O4[Si1.7Al10.3O36]

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 WarkiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ma, C., Krot, A.N., Nagashima, K. and Tschauner, O. (2014) Warkite, IMA 2013- 129. CNMNC Newsletter No. 20, June 2014: 552; Mineralogical Magazine: 78: 549-558.
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 Murchison and Vigarano. Meteoritics and Planetary Science: 50 (S1): Abstract No. 5025. 78th Annual Meeting of the Meteoritical Society

Internet Links for WarkiteHide

Localities for WarkiteHide

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.
Australia (TL)
 
  • Victoria
    • City of Greater Shepparton
      • Murchison
Ma, C., Krot, A.N., Nagashima, K. and Tschauner, O. (2014) Warkite, IMA 2013- 129. CNMNC Newsletter No. 20, June 2014, page 552; Mineralogical Magazine, 78, 549-558.
Italy (TL)
 
  • Emilia-Romagna
    • Ferrara Province
      • Vigarano Mainarda
        • Vigarano Pieve
Ma, C., Krot, A.N., Nagashima, K. and Tschauner, O. (2014) Warkite, IMA 2013- 129. CNMNC Newsletter No. 20, June 2014, page 552; Mineralogical Magazine, 78, 549-558.
Mineral and/or Locality  
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