
1) Phosphate mineral
Found on
https://www.crosswordclues.com/clue/strengite

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....
Found on
http://en.wikipedia.org/wiki/Strengite

phosphate mineral similar to variscite (q.v.) with the chemical formula FePO42H2O.[1 related articles]
Found on
http://www.britannica.com/eb/a-z/s/171
No exact match found.