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Dorrite

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About DorriteHide

John A. Dorr
Formula:
Ca4(Mg3Fe3+9)O4(Si3Al8Fe3+O36)
Idealized formula for Kopeisk material: Ca4Mg4Fe3+8[Al8Si4O20]
Colour:
red-brown, brown-black, dark brown
Lustre:
Sub-Metallic
Hardness:
Crystal System:
Triclinic
Name:
Named by Michael A. Cosca, Roland R. Rouse, and Eric J. Essene in 1987 in honor of John A. "Jack" Dorr, Jr. (1922/3 - 8 April 1986), Professor of Geology, University of Michigan, Ann Arbor, Michigan, USA, in recognition of his geologic research in Wyoming.
Stable in strongly oxidizing, high-temperature low-pressure environments.

Site occupancy for dorrite from Kopeisk (Shchipalkina et al., 2016), is: M1: (Fe3+,Mg); M2: (Fe3+,Mg); M3: 2(Fe3+,Mg); M4: 2(Fe3+,Mg); M5: 2Mg; M6: 2(Mg,Fe3+); M7: 2(Fe3+,Al); M8: 2Ca; M9: 2Ca; T1: 2(Si,Al); T2: 2(Si,Al); T3: 2Al; T4: 2Si; T5: 2(Al,Fe3+); T6: 2(Al,Fe3+).


Classification of DorriteHide

Approved
Approval Year:
1987
First Published:
1988
9.DH.40

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
69.2.1a.2

69 : INOSILICATES Chains with Side Branches or Loops
2 : Chains with Side Branches or Loops with P>2
16.23.2

16 : Silicates Containing Aluminum and other Metals
23 : Aluminosilicates of Fe, Ca, and Mg

Physical Properties of DorriteHide

Sub-Metallic
Colour:
red-brown, brown-black, dark brown
Streak:
brownish grey
Hardness:
5½ on Mohs scale
Cleavage:
Distinct/Good

Optical Data of DorriteHide

Type:
Biaxial (-)
RI values:
nα = 1.820 nβ = 1.840 nγ = 1.860
2V:
Measured: 90° , Calculated: 88°
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
small

Chemical Properties of DorriteHide

Formula:
Ca4(Mg3Fe3+9)O4(Si3Al8Fe3+O36)

Idealized formula for Kopeisk material: Ca4Mg4Fe3+8[Al8Si4O20]
IMA Formula:
Ca4[Mg3Fe3+9]O4[Si3Al8Fe3+O36]
Common Impurities:
Ti,Cr,Mn,Na,K

Crystallography of DorriteHide

Crystal System:
Triclinic
Cell Parameters:
a = 10.5 Å, b = 10.89 Å, c = 9.91 Å
α = 106.26°, β = 95.16°, γ = 124.75°
Ratio:
a:b:c = 0.964 : 1 : 0.91
Unit Cell V:
847.91 ų (Calculated from Unit Cell)

Type Occurrence of DorriteHide

Synonyms of DorriteHide

Other Language Names for DorriteHide

German:Dorrit
Spanish:Dorrita

Relationship of Dorrite to other SpeciesHide

Other Members of this group:
HøgtuvaiteCa4[Fe2+6Fe3+6]O4[Si8Be2Al2O36]Tric. 1 : P1
LeucorhöniteCa2(Mg,Fe3+,Al)6(Si,Al)6O20Tric.
Makarochkinite(Ca,Na)2Fe2+4Fe3+Ti[O2|BeAlSi4O18]Tric. 1 : P1
RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]Tric. 1 : P1
SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]Tric. 1 : P1

Related Minerals - Nickel-Strunz GroupingHide

9.DH.05LeucophaniteNaCaBeSi2O6FOrth. 2 2 2 : P21 21 21
9.DH.10OhmiliteSr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2OMon.
9.DH.15HaradaiteSrVSi2O7Orth.
9.DH.15SuzukiiteBaVSi2O7Orth.
9.DH.20BatisiteBaNaNaTi2(Si4O12)O2Orth.
9.DH.20Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2Orth.
9.DH.25TaikaniteSr3BaMn2+2(Si4O12)O2Mon.
9.DH.30KrauskopfiteBaSi2O5 · 3H2OMon.
9.DH.35Balangeroite(Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40Mon.
9.DH.35GageiteMn21(Si4O12)2O3(OH)20Mon. 2/m
9.DH.40AenigmatiteNa2Fe2+5Ti(Si6O18)O2Tric. 1 : P1
9.DH.40HøgtuvaiteCa4[Fe2+6Fe3+6]O4[Si8Be2Al2O36]Tric. 1 : P1
9.DH.40KrinoviteNa2Mg4Cr3+2(Si6O18)O2Tric.
9.DH.40Makarochkinite(Ca,Na)2Fe2+4Fe3+Ti[O2|BeAlSi4O18]Tric. 1 : P1
9.DH.40RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]Tric. 1 : P1
9.DH.40SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
9.DH.40WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]Tric. 1 : P1
9.DH.40WilkinsoniteNa2Fe2+4Fe3+2(Si6O18)O2Tric. 1 : P1
9.DH.45SapphirineMg4(Mg3Al9)O4[Si3Al9O36]Mon. 2/m : P21/b
9.DH.50Khmaralite(Mg,Al,Fe)16[(Al,Si,Be)12O36]O4Mon. 2/m : P21/b
9.DH.55Surinamite(Mg,Fe)3Al4BeSi3O16Mon.
9.DH.60Deerite(Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5Mon.
9.DH.65HowieiteNa(Fe,Mn)10(Fe,Al)2Si12O31(OH)13Tric.
9.DH.65Taneyamalite(Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44Tric.
9.DH.70JohninnesiteNa2Mn2+9Mg7(OH)8[AsO4]2[Si6O17]2Tric.
9.DH.75AgrelliteNaCa2Si4O10FTric.

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

69.2.1a.1AenigmatiteNa2Fe2+5Ti(Si6O18)O2Tric. 1 : P1
69.2.1a.3HøgtuvaiteCa4[Fe2+6Fe3+6]O4[Si8Be2Al2O36]Tric. 1 : P1
69.2.1a.4KrinoviteNa2Mg4Cr3+2(Si6O18)O2Tric.
69.2.1a.5RhöniteCa2(Mg,Fe2+,Fe3+,Ti)6[O2|(Si,Al)6O18]Tric. 1 : P1
69.2.1a.6SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
69.2.1a.7WelshiteCa4Mg9Sb3O4[Si6Be3AlFe2O36]Tric. 1 : P1
69.2.1a.8WilkinsoniteNa2Fe2+4Fe3+2(Si6O18)O2Tric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.23.1Augite(CaxMgyFez)(Mgy1Fez1)Si2O6Mon. 2/m : B2/b
16.23.3Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10Tet. 4/mmm (4/m 2/m 2/m) : P4/nnc
16.23.5Ferro-hornblende☐{Ca2}{Fe2+4Al}(AlSi7O22)(OH)2Mon.
16.23.6Magnesio-hornblende☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2Mon.
16.23.7Aerinite(Ca5.1Na0.5)(Fe3+,Al,Fe2+,Mg)4(Al,Mg)6[HSi12O36(OH)12][(CO3)1.2(H2O)12]Mon.

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 DorriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Cosca, M.A., Rouse, R.R., Essene, E.J. (1988) Dorrite [Ca2(Mg2Fe3+4)(Al4Si2)O20], a new member of the aenigmatite group from a pyrometamorphic melt-rock. American Mineralogist: 73: 1440-1448.
Burt, D.M. (1994) Vector representation of some mineral compositions in the aenigmatite group, with special reference to hogtuvaite. The Canadian Mineralogist: 32: 449-457.
Jensen, B.B. (1996) Solid solution among members of the aenigmatite group. Mineralogical Magazine: 60: 982-986.
Kunzmann, T. (1999) The aenigmatite-rhönite mineral group. European Journal of Mineralogy: 11: 743-756.
Grew, E.S., Hålenius, U., Pasero, M., Barbier, J. (2008) Recommended nomenclature for the sapphirine and surinamite group (sapphirine supergroup). Mineralogical Magazine: 72: 839-876.
Shchipalkina, N.V., Zubkova, N.V., Pekov, I.V., Koshlyakova, N.N. (2016) Dorrite from Kopeisk, South Urals, Russia: crystal structure and cation ordering. Neues Jahrbuch für Mineralogie: 193 (in press); http://forum.amiminerals.it/viewtopic.php?f=5&t=12710 (2016)

Internet Links for DorriteHide

Localities for DorriteHide

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.
Germany
 
  • Rhineland-Palatinate
    • Andernach
      • Nickenich
Kunzmann, T. (1999): The aenigmatite-rhönite mineral group. European Journal of Mineralogy: 11: 743-756.
    • Daun
      • Üdersdorf
Blaß, G. & Kruijen, F. (2014): Die Neuigkeiten aus der Vulkaneifel (2/14). Mineralien-Welt 25 (5), 62-75 (in German).
Jordan
 
  • Amman
    • Hashem region
      • Lisdan-Siwaga Fault
        • Siwaga
Khoury, H.N., Sokol, E.V., Kokh, S.N., Seryotkin, Y.V., Nigmatulina, E.N., Goryainov, S.V., Belogub, E.V., Clark, I.D. (2016): Tululite, Ca14(Fe3+,Al)(Al,Zn,Fe3+,Si,P,Mn,Mg)15O36: a new Ca zincate-aluminate from combustion metamorphic marbles, central Jordan. Mineralogy and Petrology, 110, 125-140
Russia
 
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
USA (TL)
 
  • Wyoming
    • Campbell Co.
      • Reno Junction
Amer.Min.(1988) 73, 1440-1448
    • Johnson Co.
      • Buffalo
American Mineralogist, Volume 73, pages 1440-1448, 1988
Mineral and/or Locality  
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