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Dominant species
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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.
Strengite2558
Strengite2558
Strengite2763
Strengite2763
Strengite2759
Strengite2759
Strengite2757
Strengite2757
Strengite2756
Strengite2756
Strengite2755
Strengite2755
Strengite2751
Strengite2751
Strengite2749
Strengite2749
Strengite2746
Strengite2746
Strengite2743
Strengite2743
Strengite2740
Strengite2740
Strengite2735
Strengite2735
Strengite2729
Strengite2729
Strengite2725
Strengite2725
Strengite2662
Strengite2662
Strengite2660
Strengite2660
Strengite2656
Strengite2656
Strengite2648
Strengite2648
Strengite2645
Strengite2645
Strengite2639
Strengite2639
Strengite2633
Strengite2633
Strengite2623
Strengite2623
Strengite2612
Strengite2612
Strengite2598
Strengite2598
Strengite2592
Strengite2592
Strengite2588
Strengite2588
Strengite2582
Strengite2582
Strengite2578
Strengite2578
Strengite2571
Strengite2571
Strengite2566
Strengite2566
Strengite2564
Strengite2564
Strengite2562
Strengite2562