Taranakite is a hydrated alkali iron-aluminium phosphate mineral with the chemical formula 3526ยท18 H2O. It forms from the reaction of clay minerals or aluminous rocks with solutions enriched in phosph
Two of the Sugar Loaf Islands.
Variscite is a relatively rare hydrated aluminium phosphate mineral. It is sometimes confused with turquoise; however, variscite is usually greener in color. The green color results from the presence
Cut slab of variscite at the Smithsonian. Specimen is roughly 0.5 m wide.
Variscite filling the cracks in siltstone. The sample is from Queensland, Australia. The width of the view is 11 cm (4.3 in).
Polished variscite from Nevada