Iangreyite (original) (raw)

A valid IMA mineral species

About IangreyiteHide

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Formula:

Ca2Al7(PO4)2(PO3OH)2(OH,F)15 · 8H2O

Colour:

Colourless, white, cream, yellowish, light pink

Name:

The mineral is named in honour of Dr Ian Edward Grey (b. 1944), formerly Chief Research Scientist at CSIRO Minerals, Melbourne, Australia, for his contributions to mineralogy, crystallography and the minerals-processing industry. Recently, Dr Grey’s expertise was key to solving a number of unique crystal-chemical problems related to alunite-supergroup members such as kolitschite, kintoreite and jarosite as well the structure of perhamite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:39883:1

8113dae5-23dc-4130-8280-8782f16f79d7

IMA Classification of IangreyiteHide

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Classification of IangreyiteHide

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8.DE.45

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
E : With only medium-sized cations, (OH, etc.):RO4 = 3:1

42.13.19.

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

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Transparency:

Transparent, Translucent

Colour:

Colourless, white, cream, yellowish, light pink

Fracture:

Irregular/Uneven

Comment:

Somewhat flexible to brittle.

Density:

2.46(3) g/cm3 (Measured) 2.451 g/cm3 (Calculated)

Comment:

Calculated value based on the empirical formula.

Optical Data of IangreyiteHide

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RI values:

_n_ω = 1.544(2) _n_ε = 1.554(2)

δ = 0.010

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

Pleochroism:

Non-pleochroic

Chemistry of IangreyiteHide

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Mindat Formula:

Ca2Al7(PO4)2(PO3OH)2(OH,F)15 · 8H2O

Crystallography of IangreyiteHide

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Class (H-M):

32 - Trapezohedral

Cell Parameters:

a = 6.988(1) Å, c = 16.707(3) Å

Unit Cell V:

706.54 ų (Calculated from Unit Cell)

Morphology:

Thin hexagonal tablets. The forms observed are {001} and {100}.

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

The powder diffraction pattern showed a close resemblance to that of perhamite.

Geological EnvironmentHide

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Type Occurrence of IangreyiteHide

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General Appearance of Type Material:

Thin, hexagonal tablets up to 0.4 mm in diameter and 0.02 mm thick (Silver Coin), and as coatings consisting of 0.3 mm wide clusters of minute and very thin intergrown tabular crystals with a maximum diameter of 0.2 mm (Krasno).

Place of Conservation of Type Material:

Mineral Sciences Department, Natural History Museum of Los Angeles County, California, USA (57661 and 62519).
Department of Mineralogy and Petrology, National Museum Prague, Czech Republic (P1P 20/2009).

Geological Setting of Type Material:

Weathering of Pb-Zn-Ag-containing veins in thin-bedded quartzite, argillite, and phosphatic argillite (Silver Coin). A Sn-deposit in autometamorphosed Li-mica-topaz granite with variable degrees of greisenization (Krasno). It appears to be a low-temperature alteration product of F-rich perhamite.

Associated Minerals at Type Locality:

Synonyms of IangreyiteHide

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Relationship of Iangreyite to other SpeciesHide

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Structurally related to group(s):

Chemically related to group(s):

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of IangreyiteHide

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Other InformationHide

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Notes:

Does not react with or dissolve in 1 M hydrochloric, nitric or 0.5 M sulphuric acid.

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 IangreyiteHide

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References for IangreyiteHide

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Reference List:

Mills, S. J., Kampf, A. R., Sejkora, J., Adams, P. M., Birch, W. D., Plášil, J. (2011) Iangreyite: a new secondary phosphate mineral closely related to perhamite. Mineralogical Magazine, 75 (2) 327-336 doi:10.1180/minmag.2011.075.2.327

Keck, Erich, Grey, Ian E., MacRae, Colin M., Boer, Stephanie, Hochleitner, Rupert, Rewitzer, Christian, Mumme, William G., Glenn, A. Matt, Davidson, Cameron (2022) New secondary phosphate mineral occurrences and their crystal chemistry, at the Hagendorf Süd pegmatite, Bavaria. European Journal of Mineralogy, 34 (5) 439-450 doi:10.5194/ejm-34-439-2022

Localities for IangreyiteHide

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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.