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Richelle, Visé, Liège Province, Belgium
© Arliguie M
|System:||Amorphous||Colour:||Yellow to yellow-brown, ...|
|Hardness:||2 - 3|
|Name:||For the type locality at Richelle, Liège Province, Belgium.|
Occurs as a secondary (?) mineral in phosphatic sedimentary rocks.
Classification of Richellite
|IMA status:||Questionable/Doubtful 1883|
|Explanation of status:||Probably a former gel with variable chemical composition. Other amorphous Ca-Fe-phosphates have been described in the old literature. Unit-cell parameters refer to heated material.|
|Strunz 8th edition ID:||7/B.08-70|
|Nickel-Strunz 10th (pending) edition ID:||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
|Dana 8th edition ID:||184.108.40.206|
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
13 : Miscellaneous
|Hey's CIM Ref.:||22.1.27|
22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
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Type Occurrence of Richellite
|Type Locality:||Richelle, Visé, Liège Province, Belgium|
|Place of Conservation of Type Material:||University of Liège, Liège, Belgium: #9361, #9375.|
|Year of Discovery:||1883|
|Geological Setting of type material:||Phosphatic sedimentary rocks|
|Associated Minerals at type locality:|
Physical Properties of Richellite
|Comment:||Greasy to hornlike.|
|Colour:||Yellow to yellow-brown, reddish brown|
|Streak:||Reddish to yellowish brown|
|Hardness (Mohs):||2 - 3|
Crystallography of Richellite
|Cell Parameters:||a = 5.18Å, c = 12.61Å|
|Ratio:||a:c = 1 : 2.434|
|Unit Cell Volume:||V 0.00 Å³ (Calculated from Unit Cell)|
|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."|
Optical Data of Richellite
Chemical Properties of Richellite
|Essential elements:||Ca, Fe, H, O, P|
|All elements listed in formula:||Ca, F, Fe, H, O, P|
Relationship of Richellite to other Species
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Richellite
|Other Information:||Readily soluble in acids.|
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Richellite
Cesàro and Desprets (1883) Société géologique de Belgique, Liége, Annales, Mémoires: 10: 36.
Cesàro (1884) Société géologique de Belgique, Liége, Annales, Mémoires: 11: 257.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 956-957.
McConnell, D. (1963) Thermocrystallization of richellite to produce a lazulite structure (calcium lipscombite). American Mineralogist 48, 300-307.
Jensen, M.C., J.C. Rota, and E.E. Foord (1995) The Gold Quarry mine, Carlin Trend, Eureka County, Nevada. Mineralogical Record, 26, 449–469.
Internet Links for Richellite
Localities for Richellite
The 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.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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