Richellite (original) (raw)

A valid IMA mineral species - grandfathered - questionable

About RichelliteHide

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Formula:

CaFe3+2(PO4)2(OH,F)2

Colour:

Yellow to yellow-brown, reddish brown

Lustre:

Sub-Vitreous, Greasy

Name:

For the type locality at Richelle, Liège Province, Belgium.

Occurs as a secondary (?) mineral in phosphatic sedimentary rocks.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:3413:1

efc9eb1c-7bd6-47f3-a602-e38c3f2ca1e8

IMA Classification of RichelliteHide

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

Type description reference:

Classification of RichelliteHide

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8.BB.90

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
B : With only medium-sized cations, (OH, etc.):RO4 about 1:1

42.13.2.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous

22.1.27

22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride

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 RichelliteHide

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Comment:

Greasy to hornlike.

Colour:

Yellow to yellow-brown, reddish brown

Streak:

Reddish to yellowish brown

Optical Data of RichelliteHide

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Chemistry of RichelliteHide

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Mindat Formula:

CaFe3+2(PO4)2(OH,F)2

Crystallography of RichelliteHide

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Cell Parameters:

a = 5.18 Å, c = 12.61 Å

Morphology:

Radial-fibrous globules, foliated or compact. Commonly massive.

Comment:

(Nearly) amorphous (reflections at ~15 and ~5.4 A, both very diffuse and broad). Heated (500°C) material is "tetragonal."

Geological EnvironmentHide

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Type Occurrence of RichelliteHide

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General Appearance of Type Material:

Place of Conservation of Type Material:

University of Liège, Liège, Belgium: #9361, #9375.

Geological Setting of Type Material:

Phosphatic sedimentary rocks

Associated Minerals at Type Locality:

Reference:

Cesàro, G., Despret, G. (1883) La richellite, nouvelle espèce minérale des environs de Visé. Annales de la Société géologique de Belgique: 10: 36-44.

Other Language Names for RichelliteHide

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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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Other InformationHide

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Notes:

Readily soluble in acids.

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 RichelliteHide

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References for RichelliteHide

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Reference List:

**Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.**pp.956-957

Localities for RichelliteHide

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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.