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.