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A small crystal of Strengite
Category Mineral
(repeating unit)
FePO4 · 2H2O
Strunz classification 8.CD.10
Dana classification
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M Symbol: (2/m 2/m 2/m)
Space group Pcab
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 3½ - 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 [1][2][3]

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 (1830–1897).[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]


  1. ^ "Strengite Mineral Data". Retrieved 2011-10-25. 
  2. ^ "Strengite mineral information and data". Retrieved 2011-10-25. 
  3. ^ "STRENGITE (Hydrated Iron Phosphate)". Retrieved 2011-10-25. 
  4. ^ 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 
  5. ^ Senning, Alexander (2007), Elsevier's dictionary of chemoetymology: the whies and whences of chemical nomenclature and terminology, Elsevier, p. 374, ISBN 0-444-52239-5 
  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