Dollaseite-(ce)
Dollaseite-(Ce)
A variety of Minerals
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What is Dollaseite-(ce)?
Dollaseite-(Ce) is a sorosilicate end-member epidote mineral and was discovered by Gajer (1927) in the Ostanmossa mine, Norberg district, Sweden, the mineral wrongly named "magnesium orthite" after Gajer himself was renamed after the structure refinement made to the mineral by Peacor and Dunn (1988) led to the proper classification. The name dollaseite-(Ce) was chosen in honor of Wayne Dollase, who performed broad research on the epidote-group minerals. The original confusion of the mineral's composition was because of a complex atomic composition where an exchange of cations leads to a form of dollaseite-(Ce) that at first glimpse resembles an Mg analogue of allanite, now known as dissakisite-(Ce). Dollaseite-(Ce), although not very well known is part of a broad group of minerals, the epidote group which are primarily silicates, the most abundant type of minerals on earth. Dollaseite-(Ce) forms as dark-brown subhedral crystals primarily in Swedish mines. With the ideal chemical formula, CaREEMg2AlSi3O11,(OH)F, dollaseite-(Ce) can be partially identified by its content of the rare earth element cerium.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Dollaseite-(ce) before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Dollaseite-(ce) Localities Map
See where Dollaseite-(ce) is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Characteristics of Dollaseite-(ce)
Similar to the other epidote-group minerals, dollaseite-(Ce) is monoclinic and thus is part of the space group P 2 1/M. Peacor and Dunn (1988) refined the lattice parameters of dollaseite-(Ce) and concluded that the parameters were a=8.934(18) Å, b=5.721(7)Å, c=10.176(22)Å. Dollaseite-(Ce) can generally be found in mineralized dolomite-tremolite rocks in the form of dark brown and subhedral crystals
Composition of Dollaseite-(ce)
With a general formula for the epidote group of A2M3Si3O13H dollaseite-(Ce) received its formula of CaREEMg2AlSi3O11,(OH)F based on data from electron microprobe analytical procedures. The results give the empirical formula (Ca.91 Ce.45 La.20 Nd.20 Pr.09 Sm.08 Gd.06)(Mg1.81 Fe.25)Al.97 Si3.0(OH)1.25 F.88 O10.99 from which the standard formula is then derived after applying Levinson’s rules for renaming REE minerals. Before any of these technological analyses were performed on dollaseite-(Ce) specimens, mistakes were made on the composition of the mineral. After further analysis were made it was determined that dollaseite-(Ce) was not the magnesium analogue of allanite as originally believed by Gaijer and was renamed. Geijer however, was not the only one to have had reported minerals with compositions that would be similar to a magnesium analogue of allanite. Enami and Zang, Meyer, Hanson and Pearce also reported minerals that resembled the composition of a Mg analogue of allanite but none had sufficient data, or exact composition to be declared as a Mg analogue of allanite. It was not until 1991 that Edward S. Grew established dissakisite as the actual Mg dominant allanite mineral with formula Ca(Ce,La)MgAl2Si3O12(OH).
More Images
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Quick Facts
Physical Properties
- Hardness (Mohs)
- 6.5 - 7
Chemical Properties
- Chemical Formula
- {CaCe}{MgAlMg}(Si2O7)(SiO4)(OH)F
- Elements
- Al, Ca, Ce, F, H, Mg, O, Si
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Dollaseite-(ce) FAQs
How do I identify Dollaseite-(ce)?
Dollaseite-(ce) can be identified by its hardness of 6.5 - 7 on the Mohs scale. Look for these key characteristics when examining specimens.
How hard is Dollaseite-(ce)?
Dollaseite-(ce) has a hardness of 6.5 - 7 on the Mohs scale. This gives it moderate hardness.
What is the characteristics of dollaseite-(ce) of Dollaseite-(ce)?
Similar to the other epidote-group minerals, dollaseite-(Ce) is monoclinic and thus is part of the space group P 2 1/M. Peacor and Dunn (1988) refined the lattice parameters of dollaseite-(Ce) and concluded that the parameters were a=8.934(18) Å, b=5.721(7)Å, c=10.176(22)Å. Dollaseite-(Ce) can generally be found in mineralized dolomite-tremolite rocks in the form of dark brown and subhedral crystals
What is the composition of dollaseite-(ce) of Dollaseite-(ce)?
With a general formula for the epidote group of A2M3Si3O13H dollaseite-(Ce) received its formula of CaREEMg2AlSi3O11,(OH)F based on data from electron microprobe analytical procedures. The results give the empirical formula (Ca.91 Ce.45 La.20 Nd.20 Pr.09 Sm.08 Gd.06)(Mg1.81 Fe.25)Al.97 Si3.0(OH)1.25 F.88 O10.99 from which the standard formula is then derived after applying Levinson’s rules for renaming REE minerals. Before any of these technological analyses were performed on dollaseite-(Ce) specimens, mistakes were made on the composition of the mineral. After further analysis were made it was determined that dollaseite-(Ce) was not the magnesium analogue of allanite as originally believed by Gaijer and was renamed. Geijer however, was not the only one to have had reported minerals with compositions that would be similar to a magnesium analogue of allanite. Enami and Zang, Meyer, Hanson and Pearce also reported minerals that resembled the composition of a Mg analogue of allanite but none had sufficient data, or exact composition to be declared as a Mg analogue of allanite. It was not until 1991 that Edward S. Grew established dissakisite as the actual Mg dominant allanite mineral with formula Ca(Ce,La)MgAl2Si3O12(OH).
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