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Dollaseite-(Ce)

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Formula:
{CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)F
System:
Monoclinic
Hardness:
6½ - 7
Name:
In honour of Professor Wayne A. Dollase, University of California, Los Angeles, California, USA, for his research on the crystal chemistry of minerals of the epidote group, and the cerium content of the mineral.

Classification of Dollaseite-(Ce)

Approved, 'Grandfathered' (first described prior to 1959)
9.BG.05

9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
58.2.1a.6

58 : SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
2 : Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
16.13.6

16 : Silicates Containing Aluminum and other Metals
13 : Aluminosilicates of the rare earths
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Type Occurrence of Dollaseite-(Ce)

Physical Properties of Dollaseite-(Ce)

Hardness (Mohs):
6½ - 7

Crystallography of Dollaseite-(Ce)

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 8.934(18) Å, b = 5.721(7) Å, c = 10.176(22) Å
β = 114.31(12)°
Ratio:
a:b:c = 1.562 : 1 : 1.779
Unit Cell Volume:
V 473.99 ų (Calculated from Unit Cell)
Z:
2

Optical Data of Dollaseite-(Ce)

Type:
Biaxial
RI values:
nα = 1.715 nβ = 1.718 nγ = 1.733
Max Birefringence:
δ = 0.018
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v

Chemical Properties of Dollaseite-(Ce)

Formula:
{CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)F
All elements listed in formula:

Relationship of Dollaseite-(Ce) to other Species

Other Members of Group:
Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)F
9.BG.05bAllanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(La){CaLa}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05aClinozoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.05bDissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)
9.BG.05aEpidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05Hancockite{CaPb}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05Khristovite-(Ce){CaCe}{MgAlMn2+}(Si2O7)(SiO4)(OH)F
9.BG.05Mukhinite{Ca2}{Al2V3+}(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite{Ca2}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05Piemontite-(Sr){CaSr}{Al2Mn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bManganiandrosite-(La){Mn2+La}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Tawmawite{Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)
9.BG.05Tweddillite{CaSr}{Mn3+AlMn3+}(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(Ce){CaCe}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
9.BG.05Niigataite{CaSr}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.05Manganiandrosite-(Ce){Mn2+Ce}{Mn3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Dissakisite-(La){CaLa}{Al2Mg}(Si2O7)(SiO4)O(OH)
9.BG.05Vanadoandrosite-(Ce){Mn2+Ce}{V3+AlMn2+}(Si2O7)(SiO4)O(OH)
9.BG.05Uedaite-(Ce){Mn2+Ce}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05Epidote-(Sr){CaSr}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
9.BG.05bAllanite-(Nd){CaNd}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bFerriallanite-(La){CaLa}{Fe3+AlFe2+}(Si2O7)(SiO4)O(OH)
9.BG.05bÅskagenite-(Nd){Mn2+Nd}{Al2Fe3+}(Si2O7)(SiO4)O2
9.BG.10Zoisite{Ca2}{Al3}(Si2O7)(SiO4)O(OH)
9.BG.15MacfalliteCa2Mn33+(SiO4)(Si2O7)(OH)3
9.BG.15SursassiteMn22+Al3(SiO4)(Si2O7)(OH)3
9.BG.20Julgoldite-(Fe2+)Ca2Fe2+Fe23+(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20OkhotskiteCa2(Mn,Mg)(Mn3+,Al,Fe3+)2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe2+)Ca2Fe2+Al2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Fe3+)Ca2(Fe3+,Mg)(Al,Fe3+)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Pumpellyite-(Mg)Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20Pumpellyite-(Mn2+)Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2O
9.BG.20ShuiskiteCa2MgCr2(Si2O7)(SiO4)(OH)2 · 2H2O
9.BG.20Julgoldite-(Fe3+)Ca2Fe3+Fe23+(Si2O7)(SiO4)O(OH) · H2O
9.BG.20Pumpellyite-(Al)Ca2Al3(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20PoppiiteCa2(V3+,Fe3+,Mg)(V3+,Al)2(Si2O7)(SiO4)(OH,O)2 · H2O
9.BG.20Julgoldite-(Mg)Ca2MgFe23+(Si2O7)(SiO4)(OH)2 · H2O
9.BG.25GanomalitePb9Ca5Mn(Si2O7)4(SiO4)O
9.BG.30RustumiteCa10(Si2O7)2(SiO4)(OH)2Cl2
9.BG.35Vesuvianite(Ca,Na,☐)19(Al,Mg,Fe3+)13(☐,B,Al,Fe3+)5(Si2O7)4(SiO4)10(OH,F,O)10
9.BG.35WiluiteCa19(Al,Mg)13(B,☐,Al)5(Si2O7)4(SiO4)10(O,OH)10
9.BG.35ManganvesuvianiteCa19Mn3+(Al,Mn3+,Fe3+)10(Mg,Mn2+)2(Si2O7)4(SiO4)10O(OH)9
9.BG.35FluorvesuvianiteCa19(Al,Mg,Fe2+)13(Si2O7)4(SiO4)10O(F,OH)9
9.BG.40Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7
9.BG.45DellaiteCa6(Si2O7)(SiO4)(OH)2
9.BG.50Gatelite-(Ce)CaCe3Al2(Al,Mg)(Mg,Fe2+,Al)(Si2O7)(SiO4)3(O,F)(OH,O)2
9.BG.55Västmanlandite-(Ce)Ca(Ce,La)3Al2Mg2(Si2O7)(SiO4)3(OH)2F
16.13.1Vyuntspakhkite-(Y)(Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7
16.13.2Törnebohmite-(Ce)(Ce,La)2Al(SiO4)2(OH)
16.13.3Törnebohmite-(La)(La,Ce)2Al(SiO4)2(OH)
16.13.4Allanite-(Y){CaY}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
16.13.5Allanite-(Ce){CaCe}{Al2Fe2+}(Si2O7)(SiO4)O(OH)
16.13.8Dissakisite-(Ce){CaCe}{Al2Mg}(Si2O7)(SiO4)O(OH)

Other Names for Dollaseite-(Ce)

Name in Other Languages:

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 Dollaseite-(Ce)

Reference List:
Peacor, D.R. and Dunn, P.J. (1988) Dollaseite-(Ce)(magnesium orthite redefined): structure refinement and implications for F + M 2+ substitution in epidote-group minerals. American Mineralogist: 73: 838-842.

Internet Links for Dollaseite-(Ce)

Localities for Dollaseite-(Ce)

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Namibia
 
  • Erongo Region
    • Swakopmund District
      • Arandis
Irene M. Abraham (2009): Geology and spatial distribution of uranium mineralisation in the SK anomaly area, Rossing area, Namibia, Master thesis University of the Witwatersrand.
Romania
 
  • Harghita Co.
Hirtopanu Paulina, Andersen C. Jens, Fairhurst J. Robert and Jakab Gyula (2013) Allanite-(Ce) and its associations, from the Ditrau alkaline intrusive massif. Proc. Rom. Acad., Series B, 2013, 15(1), p. 59–74
Szakáll, S. & Kristály, F., Eds. (2010): Mineralogy of Székelyland, Eastern Transylvania, Romania. Csík County Nature and Conservation Society, Miercurea-Ciuc, Romania, 321 pp.
Sweden
 
  • Dalarna
    • Avesta
      • Möklinta ore field
No reference listed
  • Västmanland
    • Norberg
      • Getback ore field
Jansson, M. Förekomster med ceriummineral i stråket Möklinta, Norberg, Riddarhyttan och Nora.
Holtstam, D., Andersson, U.B. (2007): The REE minerals of the Bastnäs-type deposits, South-Central Sweden. Canadian Mineralogist. 45, 1073-1114
Holtstam, D., Andersson, U.B. (2007): The REE minerals of the Bastnäs-type deposits, South-Central Sweden. Canadian Mineralogist. 45, 1073-1114
No reference listed
      • Röberg ore field
Peacor, D. R. & Dunn, P. J.: (1988): Dollaseite-(Ce) (magnesium orthite redefined): Structure refinement and implications for F + M2+ substitutions in epidote-group minerals. American Mineralogist. 73: 838- 842; Jansson, M. Förekomster med ceriummineral i stråket Möklinta, Norberg, Riddarhyttan och Nora.
      • Smörberg ore field
Holtstam, D., Andersson, U.B. (2007): The REE minerals of the Bastnäs-type deposits, South-Central Sweden. Canadian Mineralogist. 45, 1073-1114
Mineral and/or Locality  
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