Dissakisite-(La) (original) (raw)

A valid IMA mineral species

About Dissakisite-(La)Hide

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Formula:

(CaLa)(AlAlMg)O[Si2O7][SiO4](OH)

Colour:

Black to very dark brown.

Crystal System:

Monoclinic

Name:

For its close relationship with dissakisite-(Ce).

A member of the Allanite Subgroup of the Epidote Group.

Dissakisite-(La) is the Mg-analogue of allanite-(La), and it also forms a continuous series with dissakisite-(Ce). Like the latter mineral, it can be found in Fe-poor environments.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:27401:8

37cf5b60-1f2d-43ac-8dbb-9d712b74b123

IMA Classification of Dissakisite-(La)Hide

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IMA Formula:

CaLa(Al2Mg)[Si2O7][SiO4]O(OH)

Classification of Dissakisite-(La)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

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.

Physical Properties of Dissakisite-(La)Hide

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Colour:

Black to very dark brown.

Cleavage:

Imperfect/Fair
(001)

Density:

3.79 g/cm3 (Measured) 3.84 g/cm3 (Calculated)

Chemistry of Dissakisite-(La)Hide

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Mindat Formula:

(CaLa)(AlAlMg)O[Si2O7][SiO4](OH)

Common Impurities:

Cr,Fe,Th,Ti

Crystallography of Dissakisite-(La)Hide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 8.9616 Å, b = 5.7265 Å, c = 10.2353 Å
α = 115.193°

Ratio:

a:b:c = 1.565 : 1 : 1.787

Crystal StructureHide

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CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Hochwart - Vedetta Alta, Italy. Data from the type description.

Geological EnvironmentHide

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Type Occurrence of Dissakisite-(La)Hide

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General Appearance of Type Material:

Up to 2.5cm-sized black to very dark brown anhedral nodules, thick blades and smaller grains.

Place of Conservation of Type Material:

(-) Muséum National d'Histoire Naturelle, Paris, France (203.133)
(-) Museo di Mineralogia e Petrologia dell'Università di Padova, Padova, Italy

Geological Setting of Type Material:

In Alpine-type peridotite, under eclogite-facies conditions.

Associated Minerals at Type Locality:

Synonyms of Dissakisite-(La)Hide

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Other Language Names for Dissakisite-(La)Hide

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Relationship of Dissakisite-(La) 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 Dissakisite-(La)Hide

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References for Dissakisite-(La)Hide

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Reference List:

Tumiati, S., Godard, G., Martin, S., Nimis, P. (2005): Dissakisite-(La), a new end-member of the epidote group from the Ulten peridotites (Italian Eastern Alps): Evidence of mantle-crust interactions in subduction zones. Geophysical Research Abstracts, 7, 00616.

Tumiati, S., Carbonin, S., Mair, V., & Russo, U. (2006). Dissakisite-(La). Nuova specie dalla Val d'Ultimo, Alto Adige. Rivista Mineralogica Italiana, 30(4), 244-247.

Localities for Dissakisite-(La)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.