Seelite (original) (raw)

A valid IMA mineral species

About SeeliteHide

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Formula:

Mg(UO2)(As3+O3)0.7(AsO4)0.3 · 7H2O

Colour:

Canary yellow to bright yellow

Crystal System:

Monoclinic

Name:

Named in honor of Paul Seel (8 May 1904, Silesia, Germany - April 1982, Bala Cynwyd, Pennsylvania, USA) and Hildegard (Hilde) Schumann Seel (24 December 1901, Germany - 17 August 1987), husband and wife micro-mineral collectors from Philadelphia, Pennsylvania, USA.

Chemically, seelite is a Mg-dominant, arsenate-bearing analogue of dymkovite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3604:3

c2e0de3c-f0bd-46d1-8492-41af9e6c5328

IMA Classification of SeeliteHide

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IMA Formula:

Mg(UO2)2(AsO3,AsO4)2 · 7H2O

Type description reference:

Bariand, Pierre, Medenbach, Olaf, Piret, P., Bachet, B., Brassy, C., Deliens, Michel (1993) Seelite: a New Uranium Mineral from the Talmessi Mine, Iran, and Rabejac, France. The Mineralogical Record, 24 (6) 463-467

Classification of SeeliteHide

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4.JD.10

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
D : Arsenites, antimonites, bismuthites; with additional anions, with H2O

46.2.9.1

46 : ANTIMONITES AND ARSENITES CONTAINING HYDROXYL OR HALOGEN
2 : Miscellaneous

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 SeeliteHide

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Colour:

Canary yellow to bright yellow

Fracture:

Irregular/Uneven

Density:

3.70 g/cm3 (Measured) 3.65(5) g/cm3 (Calculated)

Optical Data of SeeliteHide

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RI values:

_n_α = 1.602 - 1.610 _n_β = 1.730 - 1.737 _n_γ = 1.740 - 1.753

2V:

Measured: 30° to 41°, Calculated: 34° to 38°

δ = 0.138 - 0.143

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

Dispersion:

Extreme, r >> v

Optical Extinction:

Z ∧ c = 5(1)°.

Comments:

X = Y = yellow; Z = colorless.

Chemistry of SeeliteHide

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Mindat Formula:

Mg(UO2)(As3+O3)0.7(AsO4)0.3 · 7H2O

Crystallography of SeeliteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 18.20(7) Å, b = 7.067(5) Å, c = 6.665(4) Å
β = 99.67(2)°

Ratio:

a:b:c = 2.575 : 1 : 0.943

Unit Cell V:

845.07 ų (Calculated from Unit Cell)

Morphology:

Platelets are elongated along [010], flattened on (100) (or rarely on (001)). The prism faces {100} and {001} are terminated by {010} or by {011} and {011}.

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0006567	Seelite	Piret P, Piret-Meunier J (1994) Structure de la seelite de Rabejac (France) European Journal of Mineralogy 6 673-677	1994	Rabejac, France	0	293
0010264	Seelite	Bachet B, Brassy C (1991) Structure of Mg[(UO2)(AsO4)]2*4H2O Acta Crystallographica C47 2013-2015		1991	Talmessi mine, Iran	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of SeeliteHide

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General Appearance of Type Material:

Transparent canary-yellow tabular crystals, flattened on (100), with a maximum length of 1 mm. They commonly form tufted spherules and rosettes of divergent hair-like needles.

Place of Conservation of Type Material:

Royal Institute of Natural Sciences, Brussels, Belgium, RC4191; University of Pierre and Marie Curie, Paris, France.

Associated Minerals at Type Locality:

Reference:

Bariand, P., Bachet, B., Brassy, C., Medenbach, O., Deliens, M., Piret, P. (1993) Seelite - a new uranium mineral from the Talmessi mine, Iran, and Rabejac, France, The Mineralogical Record: 24: 463-467.

Other Language Names for SeeliteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of SeeliteHide

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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 SeeliteHide

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References for SeeliteHide

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Reference List:

Bariand, Pierre, Medenbach, Olaf, Piret, P., Bachet, B., Brassy, C., Deliens, Michel (1993) Seelite: a New Uranium Mineral from the Talmessi Mine, Iran, and Rabejac, France. The Mineralogical Record, 24 (6) 463-467

Bariand, Pierre, Medenbach, Olaf, Piret, P., Bachet, B., Brassy, C., Deliens, Michel (1993) Seelite: a New Uranium Mineral from the Talmessi Mine, Iran, and Rabejac, France. The Mineralogical Record, 24 (6) 463-467

Localities for SeeliteHide

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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.