Category Phosphate mineral Strunz classification 8.DC.50 Crystal system Monoclinic | Formula(repeating unit) Fe3(PO4)2(OH)3·5H2O Dana classification 42.10.02.02 | |
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Crystal class Prismatic (2/m)(same H-M symbol) | ||
Allanpringite is a phosphate mineral named after Australian mineralogist Allan Pring, South Australian Museum. Allanpringite is a Fe3+ analogue Al-phosphate mineral wavellite, but it has a different crystal symmetry – monoclinic instead of orthorhombic in wavellite. It forms needle-like crystals, which are always twinned and form parallel bundles up to about 2 mm long. They are often found in association with other iron phosphates in abandoned iron mines.
References
Allanpringite Wikipedia(Text) CC BY-SA