Strengite

Strengite
Strengite
	A small crystal of Strengite
General
Category	Mineral
Formula; (repeating unit)	FePO4·2H2O
IMA symbol	Stg
Strunz classification	8.CD.10
Dana classification	40.04.01.02
Crystal system	Orthorhombic
Crystal class	Dipyramidal (mmm) ; H-M Symbol: (2/m 2/m 2/m)
Space group	Pcab
Identification
Formula mass	186.85 g/mol
Color	Colorless, pale violet, deep violet, red, carmine red, greenish white
Crystal habit	Botryoidal, radial, spherical
Cleavage	{010} Good, {001} Poor
Mohs scale hardness	3.5–4
Luster	Vitreous
Streak	White
Diaphaneity	Transparent to translucent
Specific gravity	2.84
Density	2.87 g/cm3
Optical properties	Biaxial (+)
2V angle	72° – 88°
Dispersion	r < v, relatively strong
References

Strengite is a relatively rare iron phosphate mineral with the formula: FePO₄·2H₂O.^[5] The mineral is named after the German mineralogist Johann August Streng [de] (1830–1897).^[6] Lavender, pink or purple in hue, it is similar to variscite^[7] and is partially soluble, particularly in conditions where there is a low pH and low oxidation-reduction potential.^[5] The color comes from ferric ion (Fe³⁺).^[8]

References

^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
^ "Strengite Mineral Data". Webmineral.com. Retrieved 2011-10-25.
^ "Strengite mineral information and data". Mindat.org. Retrieved 2011-10-25.
^ "STRENGITE (Hydrated Iron Phosphate)". Retrieved 2011-10-25.
^ ^a ^b Patrick, W. H. Jr.; Gotoh, S.; Williams, B. G. (February 9, 1973), "Strengite Dissolution in Flooded Soils and Sediments", Science, 179 (4073): 564–565, Bibcode:1973Sci...179..564P, doi:10.1126/science.179.4073.564, PMID 17820817, S2CID 29895850
^ Senning, Alexander (2007), Elsevier's dictionary of chemoetymology: the whies and whences of chemical nomenclature and terminology, Elsevier, p. 374, ISBN 978-0-444-52239-9
^ Pough, Frederick H.; Peterson, Roger Tory (1997), A Field Guide to Rocks and Minerals, Peterson Field Guide, vol. 7 (5th ed.), Houghton Mifflin Harcourt, p. 239, ISBN 0-395-91096-X
^ "Minerals Colored by Metal Ions". minerals.gps.caltech.edu. Retrieved 2023-03-01.

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[1] Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

[2] "Strengite Mineral Data". Webmineral.com. Retrieved 2011-10-25.

[Mindat-3] "Strengite mineral information and data". Mindat.org. Retrieved 2011-10-25.

[4] "STRENGITE (Hydrated Iron Phosphate)". Retrieved 2011-10-25.

[science179_4073_564-5] Patrick, W. H. Jr.; Gotoh, S.; Williams, B. G. (February 9, 1973), "Strengite Dissolution in Flooded Soils and Sediments", Science, 179 (4073): 564–565, Bibcode:1973Sci...179..564P, doi:10.1126/science.179.4073.564, PMID 17820817, S2CID 29895850

[senning2007-6] Senning, Alexander (2007), Elsevier's dictionary of chemoetymology: the whies and whences of chemical nomenclature and terminology, Elsevier, p. 374, ISBN 978-0-444-52239-9

[pough_peterson1997-7] Pough, Frederick H.; Peterson, Roger Tory (1997), A Field Guide to Rocks and Minerals, Peterson Field Guide, vol. 7 (5th ed.), Houghton Mifflin Harcourt, p. 239, ISBN 0-395-91096-X

[8] "Minerals Colored by Metal Ions". minerals.gps.caltech.edu. Retrieved 2023-03-01.

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v t e Phosphate minerals
Crystalline	Allanpringite Beraunite Brazilianite Eosphorite Fluorapatite Hydroxyapatite Lithiophilite Metatorbernite Monazite Struvite Taranakite Variscite Wavellite Xenotime Wycheproofite
Cryptocrystalline	Turquoise Whitlockite
Amorphous	Santabarbaraite Scorodite
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