Dollaseite-(Ce) (original) (raw)

A valid IMA mineral species - grandfathered

About Dollaseite-(Ce)Hide

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Formula:

(CaCe)(MgAlMg)F[Si2O7][SiO4](OH)

Crystal System:

Monoclinic

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.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1303:7

a51927f9-158c-4e97-83ee-aaa0dc307189

IMA Classification of Dollaseite-(Ce)Hide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

CaCe(Mg2Al)[Si2O7][SiO4]F(OH)

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)Hide

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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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of Dollaseite-(Ce)Hide

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Comment:

In thin sections, very light brown with a pinkish tinge.

Density:

3.90 g/cm3 (Measured)

Optical Data of Dollaseite-(Ce)Hide

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RI values:

_n_α = 1.715 _n_β = 1.718 _n_γ = 1.733

δ = 0.018

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

Displays abnormal bluish interference colors.

Chemistry of Dollaseite-(Ce)Hide

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Mindat Formula:

(CaCe)(MgAlMg)F[Si2O7][SiO4](OH)

Crystallography of Dollaseite-(Ce)Hide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

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 V:

473.99 ų (Calculated from Unit Cell)

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.

Crystal StructureHide

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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 DiffractionHide

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Powder Diffraction Data:

Comments:

Data from Peacor and Dunn, 1988.

Geological EnvironmentHide

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Type Occurrence of Dollaseite-(Ce)Hide

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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)Hide

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Other Language Names for Dollaseite-(Ce)Hide

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Relationship of Dollaseite-(Ce) to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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)Hide

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References for Dollaseite-(Ce)Hide

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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)Hide

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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

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