Dollaseite-(Ce)
A valid IMA mineral species - grandfathered
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About Dollaseite-(Ce)
Wayne Dollase
Formula:
(CaCe)(MgAlMg)F[Si2O7][SiO4](OH)
Colour:
Brown
Hardness:
6½ - 7
Specific Gravity:
3.90
Crystal System:
Monoclinic
Member of:
Name:
In honour of Professor Wayne A. Dollase (1938-), 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.
Dollaseite Subgroup of the Epidote Group.
Chemically related to dissakisite-(Ce), gatelite-(Ce), manaevite-(Ce), västmanlandite-(Ce), and somewhat to khristovite-(Ce).
Chemically related to dissakisite-(Ce), gatelite-(Ce), manaevite-(Ce), västmanlandite-(Ce), and somewhat to khristovite-(Ce).
Unique Identifiers
Mindat ID:
1303
Long-form identifier:
mindat:1:1:1303:7
GUID
(UUID V4):
(UUID V4):
a51927f9-158c-4e97-83ee-aaa0dc307189
IMA Classification of Dollaseite-(Ce)
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CaCe(Mg2Al)[Si2O7][SiO4]F(OH)
First published:
1927
Approval history:
The mineral now known as dollaseite-(Ce) was first described by Geijer in 1927 as “magnesium ortit”, based upon the high Mg content he found in some of the allanites (orthite) from the Östanmossa mine, Röberg ore field, Norberg, Västmanland County, Sweden. He considered this mineral as the Mg-analogue of allanite-(Ce). Peacor and Dunn (1988) re-investigates material corresponding to Geijer’s "magnesium ortit" using modern methods. They found an elevated content of Mg in their material compared to what would be expected in the the Mg analogue of allanite-(Ce), finding nor only a Fe2+ <-> Mg2+ substitution one would expect from the Mg analogue of allanite, but also a Mg2+F- <->Al3+O2- substitution, giving a new mineral, dollaseite-(Ce)
Classification of Dollaseite-(Ce)
9.BG.05
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
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)
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
16 : Silicates Containing Aluminum and other Metals
13 : Aluminosilicates of the rare earths
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Dls-Ce | 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 Dollaseite-(Ce)
Colour:
Brown
Comment:
In thin sections, very light brown with a pinkish tinge.
Hardness:
6½ - 7 on Mohs scale
Density:
3.90 g/cm3 (Measured)
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.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v
Pleochroism:
Weak
Comments:
Displays abnormal bluish interference colors.
Chemistry of Dollaseite-(Ce)
Mindat Formula:
(CaCe)(MgAlMg)F[Si2O7][SiO4](OH)
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)°
β = 114.31(12)°
Ratio:
a:b:c = 1.562 : 1 : 1.779
Unit Cell V:
473.99 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Massive. Subhedral crystals, often in contact with carbonate. Also radiating, aggregates of lath-like crystals that are simple twinned crystals. The laths may be extremely thin, even at high magnification, such that the aggregate is a fibrous felt.
Twinning:
Can be twinned.
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0001187 | Dollaseite-(Ce) | 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 |  | 1988 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.29 Å | (20) |
| 8.25 Å | (10) |
| 5.13 Å | (10) |
| 3.52 Å | (20) |
| 3.26 Å | (15) |
| 2.915 Å | (100) |
| 2.852 Å | (30) |
| 2.709 Å | (70) |
| 2.185 Å | (10) |
| 2.150 Å | (20) |
| 1.601 Å | (10) |
Comments:
Data from Peacor and Dunn, 1988.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-𝑇 alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Type Occurrence of Dollaseite-(Ce)
General Appearance of Type Material:
Brown, massive to subhedral 0.3-mm diameter crystals.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, number R06505 (holotype/neotype).
Associated Minerals at Type Locality:
Synonyms of Dollaseite-(Ce)
Other Language Names for Dollaseite-(Ce)
German:Dollaseit-(Ce)
Russian:Долласеит-(Ce)
Relationship of Dollaseite-(Ce) to other Species
Member of:
Other Members of this group:
| Khristovite-(Ce) | (CaCe)(MgAlMn2+)F[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
| Vielleaureite-(Ce) | (Mn2+Ce)(MgAlMn2+)F[Si2O7][SiO4](OH) | Mon. 2/m : P21/m |
Common Associates
Associated Minerals Based on Photo Data:
| 3 photos of Dollaseite-(Ce) associated with Fluorbritholite-(Ce) | (Ce,Ca)5(SiO4)3F |
| 3 photos of Dollaseite-(Ce) associated with Västmanlandite-(Ce) | CaCe3(MgAl2Mg)[Si2O7][SiO4]3F(OH)2 |
| 3 photos of Dollaseite-(Ce) associated with Tremolite | ◻Ca2Mg5(Si8O22)(OH)2 |
| 1 photo of Dollaseite-(Ce) associated with Norbergite | Mg3(SiO4)F2 |
| 1 photo of Dollaseite-(Ce) associated with Bastnäsite-(Ce) | Ce(CO3)F |
| 1 photo of Dollaseite-(Ce) associated with Gadolinite-(Nd) | Nd2Fe2+Be2O2(SiO4)2 |
| 1 photo of Dollaseite-(Ce) associated with Dissakisite-(Ce) | (CaCe)(AlAlMg)O[Si2O7][SiO4](OH) |
| 1 photo of Dollaseite-(Ce) associated with Cerite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3(SiO3OH)4(OH)3 |
Related Minerals - Strunz-mindat Grouping
| 9.BG. | Shuiskite-(Cr) | Ca2Cr3+Cr3+2[Si2O6OH][SiO4](OH)2O |
| 9.BG. | Alnaperbøeite-(Ce) | Ca(Ce2.5Na0.5)(AlAl2Al)[Si2O7][SiO4]3O(OH)2 |
| 9.BG. | Magnesiovesuvianite | Ca19MgAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
| 9.BG. | Alumovesuvianite | Ca19AlAl4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| 9.BG. | Zoisite-(Pb) | (CaPb)(AlAlAl)O[Si2O7][SiO4](OH) |
| 9.BG. | Vielleaureite-(Ce) | (Mn2+Ce)(MgAlMn2+)F[Si2O7][SiO4](OH) |
| 9.BG. | Heflikite | (CaCa)(AlAlSc)O[Si2O7][SiO4](OH) |
| 9.BG. | Zilbermintsite-(La) | (CaLa5)(Fe3+Al3Fe2+)[Si2O7][SiO4]5O(OH)3 |
| 9.BG.05b | Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Allanite-(La) | (CaLa)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Allanite-(Y) | (CaY)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05a | Clinozoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Dissakisite-(Ce) | (CaCe)(AlAlMg)O[Si2O7][SiO4](OH) |
| 9.BG.05a | Epidote | (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| 9.BG.05a | Hancockite | (CaPb)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Khristovite-(Ce) | (CaCe)(MgAlMn2+)F[Si2O7][SiO4](OH) |
| 9.BG.05a | Mukhinite | (CaCa)(AlAlV3+)O[Si2O7][SiO4](OH) |
| 9.BG.05a | Piemontite | (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Piemontite-(Sr) | (CaSr)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Manganiandrosite-(La) | (Mn2+La)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Tweddillite | (CaSr)(Mn3+AlMn3+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Ferriallanite-(Ce) | (CaCe)(Fe3+AlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Niigataite | (CaSr)(AlAlAl)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Manganiandrosite-(Ce) | (Mn2+Ce)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Dissakisite-(La) | (CaLa)(AlAlMg)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Vanadoandrosite-(Ce) | (Mn2+Ce)(V3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Uedaite-(Ce) | (Mn2+Ce)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05a | Epidote-(Sr) | (CaSr)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Allanite-(Nd) | (CaNd)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Unnamed (Mg-analogue of Ferriallanite-(Ce)) | (CaCe)(Fe3+AlMg)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Unnamed (Mn3+-analogue of Ferriakasakaite-(Ce)) | (CaCe)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Ferriallanite-(La) | (CaLa)(Fe3+AlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Åskagenite-(Nd) | (Mn2+Nd)(AlAlFe3+)O[Si2O7][SiO4]O |
| 9.BG.05 | Piemontite-(Pb) | (CaPb)(AlAlMn3+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Vanadoallanite-(La) | (CaLa)(V3+AlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Ferriakasakaite-(La) | (CaLa)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Ferriandrosite-(La) | (Mn2+La)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Androsite-(Ce) | (Mn2+Ce)(AlAlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05 | Ferriandrosite-(Ce) | (Mn2+Ce)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05a v | Unnamed (Ga-analogue of Epidote) | (CaCa)(AlAlGa3+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | UM1989-32-SiO:AlCaFeHREE | (Ca0.5◻0.5REE)(AlAlFe3+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Manganiakasakaite-(La) | (CaLa)(Mn3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Ferriakasakaite-(Ce) | (CaCe)(Fe3+AlMn2+)O[Si2O7][SiO4](OH) |
| 9.BG.05b | Allanite-(Sm) | (CaSm)(AlAlFe2+)O[Si2O7][SiO4](OH) |
| 9.BG.10 | Zoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
| 9.BG.15 | Macfallite | Ca2Mn3+3(SiO4)(Si2O7)(OH)3 |
| 9.BG.15 | Sursassite | Mn2+2Al3(SiO4)(Si2O7)(OH)3 |
| 9.BG.20 | Julgoldite-(Fe2+) | Ca2Fe2+Fe3+2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.20 | Okhotskite | Ca2Mn2+Mn3+2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.20 | Pumpellyite-(Fe2+) | Ca2Fe2+Al2(Si2O7)(SiO4)(OH,O)2 · H2O |
| 9.BG.20 | Pumpellyite-(Fe3+) | Ca2Fe3+Al2(Si2O7)(SiO4)(OH,O)2 · H2O |
| 9.BG.20 | Pumpellyite-(Mg) | Ca2MgAl2(Si2O7)(SiO4)(OH)2 · H2O |
| 9.BG.20 | Pumpellyite-(Mn2+) | Ca2Mn2+Al2(Si2O7)(SiO4)(OH)2 · H2O |
| 9.BG.20 | Shuiskite-(Mg) | Ca2MgCr3+2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.20 | Julgoldite-(Fe3+) | Ca2Fe3+Fe3+2[Si2O6OH][SiO4](OH)2O |
| 9.BG.20 | Pumpellyite-(Al) | Ca2Al3(Si2O7)(SiO4)(OH,O)2 · H2O |
| 9.BG.20 | Poppiite | Ca2V3+V3+2[Si2O6OH][SiO4](OH)2O |
| 9.BG.20 | Julgoldite-(Mg) | Ca2MgFe3+2[Si2O6OH][SiO4](OH)2(OH) |
| 9.BG.25 | Ganomalite | Pb9Ca5Mn(Si2O7)4(SiO4)O |
| 9.BG.25 | Wayneburnhamite | Pb9Ca6(Si2O7)3(SiO4)3 |
| 9.BG.30 | Rustumite | Ca10(Si2O7)2(SiO4)(OH)2Cl2 |
| 9.BG.35 | Vesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| 9.BG.35 | Wiluite | Ca19MgAl4(Al,Mg)8(B,◻)4◻[Si2O7]4[(SiO4)10]O(O,OH)9 |
| 9.BG.35 | Manganvesuvianite | Ca19Mn3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(OH)9 |
| 9.BG.35 | Fluorvesuvianite | Ca19Fe3+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10]O(F,OH)9 |
| 9.BG.35 | Cyprine | Ca19Cu2+Al4(Al6Mg2)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
| 9.BG.35 | Hongheite | Ca19Fe2+Al4(Fe3+,Mg)8(◻4)B[Si2O7]4[(SiO4)10]O(OH,O)9 |
| 9.BG.35 | Milanriederite | (Ca18[REE])Fe3+Al4(Mg4Al4)(◻4)◻[Si2O7]4[(SiO4)10](OH)(OH)9 |
| 9.BG.35 | Manaevite-(Ce) | (Ca13Ce4[H2O]2)Mg(Al3Mg)(Mg3Ti3Fe3+2)(◻4)◻[Si2O7]4[(SiO4)8(H4O4)2]O(OH)9 |
| 9.BG.40 | Vyuntspakhkite-(Y) | (Y,Yb)4Al2.5-1.5(Si,Al)1.5-2.5(SiO4)4O(OH)7 |
| 9.BG.45 | Dellaite | Ca6Si3O11(OH)2 |
| 9.BG.50 | Gatelite-(Ce) | CaCe3(AlAl2Mg)[Si2O7][SiO4]3O(OH)2 |
| 9.BG.50 | Perbøeite-(Ce) | CaCe3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 |
| 9.BG.50 | Ferriperbøeite-(Ce) | CaCe3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2 |
| 9.BG.50 | Ferriperbøeite-(La) | CaLa3(Fe3+Al2Fe2+)[Si2O7][SiO4]3O(OH)2 |
| 9.BG.50 | Perbøeite-(La) | CaLa3(AlAl2Fe2+)[Si2O7][SiO4]3O(OH)2 |
| 9.BG.55 | Västmanlandite-(Ce) | CaCe3(MgAl2Mg)[Si2O7][SiO4]3F(OH)2 |
| 9.BG.60 | Radekškodaite-(La) | (CaLa5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 |
| 9.BG.60 | Radekškodaite-(Ce) | (CaCe5)(Al4Fe2+)[Si2O7][SiO4]5O(OH)3 |
| 9.BG.60 | Radekškodaite Group | (CaM5)([Fe3+Al3]Fe2+)[Si2O7][SiO4]5O(OH)3 |
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.
Internet Links for Dollaseite-(Ce)
mindat.org URL:
https://www.mindat.org/min-1303.html
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References for Dollaseite-(Ce)
Reference List:
Armbruster, Thomas, Bonazzi, Paola, Akasaka, Masahide, Bermanec, Vladimir, Chopin, Christian, Gieré, Reto, Heuss-Assbichler, Soraya, Liebscher, Axel, Menchetti, Silvio, Pan, Yuanming, Pasero, Marco (2006) Recommended nomenclature of epidote-group minerals. European Journal of Mineralogy, 18 (5) 551-567 doi:10.1127/0935-1221/2006/0018-0551
Localities for Dollaseite-(Ce)
symbol to view information about a locality.
The Locality List
- 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).
All localities listed without proper references should be considered as questionable.
Namibia | |
| Irene M. Abraham (2009) |
Romania | |
| Hirtopanu Paulina et al. (2013) |
| Szakáll et al. (2010) | |
Sweden | |
| Jansson (2001) |
| Jansson (2001) | |
| Jansson (2001) | |
| Jansson (2001) | |
| Jansson (2001) |
| Holtstam et al. (2007) +1 other reference | |
| Holtstam et al. (2007) | |
| Peacor et al. (1988) +1 other reference |
| Holtstam et al. (2007) |
Quick NavTopAbout Dollaseite-(Ce)Unique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Norberg, Västmanland County, Sweden