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Dominant species
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Strengite
Strengite
Chemical
Formula
FePO4 · 2H2O
Species
Phosphates
Crystal
System
Orthorhombic
Mohs
Scale
3-4
Specific
Gravity
2.84
Color
Colorless, pale Purple, deep Purple, red, carmine red, greenish white
Streak
White
Luster
Vitreous
Refractive
Index
n = 1.697 - 1.708 n = 1.708 - 1.719 n = 1.741 - 1.745
Diaphaneity
Transparent, Translucent
Cleavage
Distinct/GoodGood on , poor on
Crystal Habit:Botryoidal, radial, spherical
Geological Setting:Secondary mineral formed under surface or near-surface conditions by the alteration of iron-bearing phosphates, such as Triphylite in pegmatite, or Dufrenite, or may occur in limonite ore deposits and gossans, magnetite iron ores, or rarely as a cave mineral.
Strengite is a relatively rare iron phosphate mineral with the formula: FePO4 · 2H2O. The mineral is named after the German mineralogist Johann August Streng (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.

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