Strengite

Strengite

A small crystal of Strengite
General
Category Mineral
Chemical formula FePO4 · 2H2O
Strunz classification 08.CD.10
Dana classification 40.04.01.02
Identification
Molar mass 186.85 g
Color Colorless, pale violet, deep violet, red, carmine red, greenish white
Crystal habit Botryoidal, radial, spherical
Crystal system Orthorhombic
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]

References

  1. ^ "Strengite Mineral Data". Webmineral.com. http://webmineral.com/data/Strengite.shtml. Retrieved 2011-10-25. 
  2. ^ "Strengite mineral information and data". Mindat.org. http://www.mindat.org/min-3801.html. Retrieved 2011-10-25. 
  3. ^ "STRENGITE (Hydrated Iron Phosphate)". http://www.galleries.com/Strengite. 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, doi:10.1126/science.179.4073.564 
  5. ^ Senning, Alexander (2007), Elsevier's dictionary of chemoetymology: the whies and whences of chemical nomenclature and terminology, Elsevier, p. 374, ISBN 0444522395, http://books.google.com/books?id=Fl4sdCYrq3cC&pg=PA374 
  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 039591096X, http://books.google.com/books?id=C-7APnYVG04C&pg=PA239 
Crystalline
Cryptocrystalline
Amorphous