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Addibischoffite

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Addi Bischoff
Formula:
Ca2Al6Al6O20
Specific Gravity:
3.41 (Calculated)
Crystal System:
Triclinic
Name:
Name in honor of Addi Bischoff (b. 4 April 1955, Werdohl, Germany), cosmochemist at University of Münster, Germany, for his many contributions to research on mineralogy of carbonaceous chondrites, including CAIs in CH chondrites.
The Al analogue of beckettite and warkite.

Chemically similar to brownmillerite, dmitryivanovite, grossite, hibonite, and krotite.

A new refractory phase formed in the solar nebula, most likely as a result of crystallization from an 16O-rich Ca, Al-rich melt under high-temperature (~1575 °C) and low-pressure (~10−4 to 10−5 bar) conditions in the CAI-forming region near the protosun, providing a new puzzle piece toward understanding the details of nebular processes (Ma et al. 2017).


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Classification of AddibischoffiteHide

Approved
Approval Year:
2015
First Published:
2017
4.BC.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
C : With medium-sized and large cations

Physical Properties of AddibischoffiteHide

Density:
3.41 g/cm3 (Calculated)

Chemical Properties of AddibischoffiteHide

Formula:
Ca2Al6Al6O20

Crystallography of AddibischoffiteHide

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 = 106°, β = 96°, γ = 124.7°
Ratio:
a:b:c = 0.964 : 1 : 0.827
Unit Cell V:
739.7 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.937(59)
2.683(66)
2.544(100)
2.541(78)
2.540(71)
2.104(78)
2.103(78)
2.089(83)

Occurrences of AddibischoffiteHide

Paragenetic Mode(s):

Type Occurrence of AddibischoffiteHide

General Appearance of Type Material:
Found in the core of a Ca-Al-rich inclusion (CAI) in the Acfer 214 CH3 carbonaceous chondrite
Place of Conservation of Type Material:
Type material is deposited in the G.J. Wasserburg Meteorite Collection (section Acfer 214-1580) of the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA
Empirical Formula of Type Material:
(Ca2.00)(Al2.55Mg1.73V3+1.08Ti3+0.50Ca0.09Fe2+0.056.01(Al4.14Si1.86)O20
Chemical Analysis of Type Material:
Al2O344.63 %
CaO15.36 %
SiO214.62 %
V2O310.64 %
MgO9.13 %
Ti2O34.70 %
FeO0.46 %
Total:99.54 %
Geological Setting of Type Material:
CH3 carbonaceous chondrite
Associated Minerals at Type Locality:
Reference:
Ma, C., Krot, A.N., Nagashima, K. (2017) Addibischoffite, Ca2Al6Al6O20, a new calcium aluminate mineral from the Acfer 214 CH carbonaceous chondrite: A new refractory phase from the solar nebula. American Mineralogist: 102: 1556-1560.

Synonyms of AddibischoffiteHide

Relationship of Addibischoffite to other SpeciesHide

Other Members of this group:
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]
WarkiteCa2Sc6Al6O20Tric. 1 : P1

Related Minerals - Nickel-Strunz GroupingHide

4.BC.05MarokiteCaMn3+2O4Orth.
4.BC.10DmitryivanoviteCaAl2O4Mon. 2/m : P21/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 AddibischoffiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ma, C. and Krot, A.N. (2015) Addibischoffite, IMA 2015-001. CNMNC Newsletter No. 25, June 2015, page 532; Mineralogical Magazine: 79: 529-535.
Ma, C., Krot, A.N., Nagashima, K. (2017) Addibischoffite, Ca2Al6Al6O20, a new calcium aluminate mineral from the Acfer 214 CH carbonaceous chondrite: A new refractory phase from the solar nebula. American Mineralogist: 102: 1556-1560.

Internet Links for AddibischoffiteHide

Localities for AddibischoffiteHide

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.
Algeria (TL)
 
  • Tamanghasset Province
    • Tanezrouft
Ma, C. and Krot, A.N. (2015) Addibischoffite, IMA 2015-001. CNMNC Newsletter No. 25, June 2015, page 532; Mineralogical Magazine, 79, 529-535;Ma, C., Krot, A.N., Nagashima, K. (2017): Addibischoffite, Ca2Al6Al6O20, a new calcium aluminate mineral from the Acfer 214 CH carbonaceous chondrite: A new refractory phase from the solar nebula. American Mineralogist: 102: 1556-1560.
Mineral and/or Locality  
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