Strengite is a relatively rare iron phosphate mineral with the formula: FePO4·2H2O. The mineral is named after the German mineralogist (1830–1897). Lavender, pink or purple in hue, it is similar to variscite and is partially soluble, particularly in conditions where there is a low pH and low oxidation-reduction potential. The color comes from ferric ion (Fe3+).
via Wikipedia infobox
{{Infobox mineral | name = Strengite | boxwidth = | boxbgcolor = | image = Strengite-142745.jpg | imagesize = 260px | alt = | caption = A small crystal of Strengite | category = | formula = FePO4·2H2O | IMAsymbol = Stg | molweight = 186.85 g/mol | strunz = 8.CD.10 | dana = 40.04.01.02 | system = Orthorhombic | class = Dipyramidal (mmm) H-M Symbol: (2/m 2/m 2/m) | symmetry = Pcab | unit cell = | color = Colorless, pale violet, deep violet, red, carmine red, greenish white | colour = | habit = Botryoidal, radial, spherical | twinning = | cleavage = {010} Good, {001} Poor | fracture = | tenacity = | mohs = 3.5–4 | luster = Vitreous | streak = White | diaphaneity = Transparent to translucent | gravity = 2.84 | density = | polish = | opticalprop = Biaxial (+) | refractive = | birefringence = | pleochroism = | 2V = 72° – 88° | dispersion = r 4·2H2O. The mineral is named after the German mineralogist (1830–1897). Lavender, pink or purple in hue, it is similar to variscite and is partially soluble, particularly in conditions where there is a low pH and low oxidation-reduction potential. The color comes from ferric ion (Fe3+).
==References==
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