Strengite

Strengite
	A small crystal of Strengite
General
Category	Mineral
Formula; (repeating unit)	FePO4·2H2O
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
\|re\|er}}	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 (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

↑ "Strengite Mineral Data". Webmineral.com. http://webmineral.com/data/Strengite.shtml.
↑ "Strengite mineral information and data". Mindat.org. http://www.mindat.org/min-3801.html.
↑ "STRENGITE (Hydrated Iron Phosphate)". http://www.galleries.com/Strengite.
↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
↑ ^5.0 ^5.1 Patrick, W. H. Jr.; Gotoh, S.; Williams, B. G. (February 9, 1973), "Strengite Dissolution in Flooded Soils and Sediments", Science 179 (4073): 564–565, doi:10.1126/science.179.4073.564, PMID 17820817, Bibcode: 1973Sci...179..564P
↑ 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, https://books.google.com/books?id=Fl4sdCYrq3cC&pg=PA374
↑ Pough, Frederick H.; Peterson, Roger Tory (1997), A Field Guide to Rocks and Minerals, Peterson Field Guide, 7 (5th ed.), Houghton Mifflin Harcourt, p. 239, ISBN 0-395-91096-X, https://books.google.com/books?id=C-7APnYVG04C&pg=PA239
↑ "Minerals Colored by Metal Ions". http://minerals.gps.caltech.edu/color_causes/Metal_Ion/index.html.

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Original source: https://en.wikipedia.org/wiki/Strengite. Read more

[1] "Strengite Mineral Data". Webmineral.com. http://webmineral.com/data/Strengite.shtml.

[Mindat-2] "Strengite mineral information and data". Mindat.org. http://www.mindat.org/min-3801.html.

[3] "STRENGITE (Hydrated Iron Phosphate)". http://www.galleries.com/Strengite.

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

[science179_4073_564-5] 5.0 ^5.1 Patrick, W. H. Jr.; Gotoh, S.; Williams, B. G. (February 9, 1973), "Strengite Dissolution in Flooded Soils and Sediments", Science 179 (4073): 564–565, doi:10.1126/science.179.4073.564, PMID 17820817, Bibcode: 1973Sci...179..564P

[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, https://books.google.com/books?id=Fl4sdCYrq3cC&pg=PA374

[pough_peterson1997-7] Pough, Frederick H.; Peterson, Roger Tory (1997), A Field Guide to Rocks and Minerals, Peterson Field Guide, 7 (5th ed.), Houghton Mifflin Harcourt, p. 239, ISBN 0-395-91096-X, https://books.google.com/books?id=C-7APnYVG04C&pg=PA239

[8] "Minerals Colored by Metal Ions". http://minerals.gps.caltech.edu/color_causes/Metal_Ion/index.html.

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