Strengite

Strengite is a relatively rare iron phosphate mineral with the formula: FePO4 · 2H2O.[4] The mineral is named after the German mineralogist Johann August Streng (18301897).[5] Lavender, pink or purple in hue, it is similar to variscite[6] and is partially soluble, particularly in conditions where there is a low pH and low oxidation-reduction potential.[4]

Strengite
A small crystal of Strengite
General
CategoryMineral
Formula
(repeating unit)
FePO4 · 2H2O
Strunz classification8.CD.10
Dana classification40.04.01.02
Crystal systemOrthorhombic
Crystal classDipyramidal (mmm)
H-M Symbol: (2/m 2/m 2/m)
Space groupPcab
Identification
Formula mass186.85 g/mol
ColorColorless, pale violet, deep violet, red, carmine red, greenish white
Crystal habitBotryoidal, radial, spherical
Cleavage{010} Good, {001} Poor
Mohs scale hardness3 12 - 4
LusterVitreous
StreakWhite
DiaphaneityTransparent to translucent
Specific gravity2.84
Density2.87 g/cm3
Optical propertiesBiaxial (+)
2V angle72° - 88°
Dispersionr < v, relatively strong
References[1][2][3]

References

  1. "Strengite Mineral Data". Webmineral.com. Retrieved 2011-10-25.
  2. "Strengite mineral information and data". Mindat.org. Retrieved 2011-10-25.
  3. "STRENGITE (Hydrated Iron Phosphate)". Retrieved 2011-10-25.
  4. 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
  5. 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
  6. 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


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