Dissakisite-(Ce) (original) (raw)
A valid IMA mineral species
About Dissakisite-(Ce)Hide
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Formula:
(CaCe)(AlAlMg)O[Si2O7][SiO4](OH)
Colour:
Pale yellow-brown in thin section.
Crystal System:
Monoclinic
Name:
Named in 1991 by Edward S. Grew, Eric J. Essene, Donald R. Peacor, Shu-Chun Su, and Masao Asami from the Greek for twice over, for a second magnesium analog of allanite being described. The suffix follows the Levinson rule for minerals with essential REE (and the nomenclature for epidote-group minerals); denoting predominant cerium.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:1296:2
ac7253c7-fd32-4cac-9cd5-044b06d5b4e5
IMA Classification of Dissakisite-(Ce)Hide
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IMA Formula:
CaCe(Al2Mg)[Si2O7][SiO4]O(OH)
Classification of Dissakisite-(Ce)Hide
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9.BG.05b
9 : SILICATES (Germanates)
B : Sorosilicates
G : Sorosilicates with mixed SiO4 and Si2O7 groups; cations in octahedral [6] and greater coordination
58.2.1a.5
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)
16.13.8
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.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Dis-Ce | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Dis | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Dissakisite-(Ce)Hide
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Colour:
Pale yellow-brown in thin section.
Cleavage:
None Observed
No cleavage was observed (type material), but by analogy to other members of the epidote group, there is probably a {001} cleavage.
Density:
3.75(15) g/cm3 (Measured) 4.00(3) g/cm3 (Calculated)
Optical Data of Dissakisite-(Ce)Hide
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RI values:
_n_α = 1.735 _n_β = 1.741 _n_γ = 1.758
2V:
Measured: 64° , Calculated: 62°
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Optical Extinction:
Y = b; Z ∧ a = 23.7°.
Comments:
X = pale brown, Y = Z = light yellow-brown.
Comments:
Absorption: X < Y = Z.
Chemistry of Dissakisite-(Ce)Hide
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Mindat Formula:
(CaCe)(AlAlMg)O[Si2O7][SiO4](OH)
Crystallography of Dissakisite-(Ce)Hide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 8.905(1) Å, b = 5.684(1) Å, c = 10.113(1) Å
β = 114.62(2)°
Ratio:
a:b:c = 1.567 : 1 : 1.779
Unit Cell V:
465.35 ų (Calculated from Unit Cell)
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005294 | Dissakisite-(Ce) | Rouse R C, Peacor D R (1993) The crystal structure of dissakisite-(Ce),the Mg analogue of allanite-(Ce) The Canadian Mineralogist 31 153-157 |  |
1993 | Balchen Mountain, East Antartica | 0 | 293 |
| 0009130 | Dissakisite-(Ce) | Hoshino M, Kimata M, Nishida N, Shimizu M (2008) Crystal chemical significance of chemical zoning in dissakisite-(Ce) Physics and Chemistry of Minerals 35 59-70 | 2008 | Trimouns dolomite mine, France | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.698 Å | (100) |
| 2.910 Å | (90) |
| 2.622 Å | (60) |
| 3.50 Å | (50) |
| 2.842 Å | (50) |
| 9.1 Å | (40) |
| 2.177 Å | (40) |
Geological EnvironmentHide
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Type Occurrence of Dissakisite-(Ce)Hide
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General Appearance of Type Material:
Occurs sparingly in thin section as a few anhedral grains 0.05-0.6 mm in diameter.
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 168421.
Geological Setting of Type Material:
Associated Minerals at Type Locality:
Synonyms of Dissakisite-(Ce)Hide
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Other Language Names for Dissakisite-(Ce)Hide
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Relationship of Dissakisite-(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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Notes:
No cathodoluminescence was observed.
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 Dissakisite-(Ce)Hide
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References for Dissakisite-(Ce)Hide
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Reference List:
Grew, Edward S., Essene, Eric J., Peacor, Donald R., Su, Shu-chun, Asami, Masao (1991) Dissakisite-(Ce), a new member of the epidote group and the Mg analogue of allanite-(Ce), from Antarctica. American Mineralogist, 76 (11-12) 1990-1997
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 Dissakisite-(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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- 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). 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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.