Strengite

Strengite

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]   Wikipedia}  

 ^{You may remember my pictures of Variscite on Nov. 26, 2016.}

^Strengite

 

Strengite

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Boracite

Boracite

I must confess that I still don't have a concept of this crystal in my mind even after photographing it.  I am unsure what the other side looks like.  It is so tiny that I can't seem to get it to set on the visible side.  This might be a good candidate for a video.

Boracite

This is a shot from the side.

The chemical formula is Mg₃B₇O₁₃Cl.  Mohs scale hardness 7 - 7.5.  Wikipedia describes it Crystal habit Crystalline, disseminated (pseudocubic)

This sample came from near Hanover, Germany.



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