Ferrian Variscite

(Al,Fe)PO4·2H2O
Also known as
  • Phosphochromite (of Shepard)
Variety of
Variscite
VarisciteAl(PO4) · 2H2O

Where it forms, where it's found

Geological setting

Insular rock-phosphate deposits.

10recorded occurrences
Source · OpenStreetMap

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen615.99995.994
44.89%
26FeIronIron155.84555.845
26.12%
15PPhosphorusPhosphorus130.97430.974
14.48%
13AlAluminiumAluminium126.98226.982
12.62%
1HHydrogenHydrogen41.0084.032
1.89%
Total213.827100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From Mindat formula

Synonyms

  • Phosphochromite (of Shepard)

Literature, links & citation

Citations
  1. 1869Shepard (1869) American Journal of Science: 47: 428 (as Redondite).
  2. 1910Lacroix, A. (1910) Minéralogie de la France et de ses colonies Vol. 4. Library Polytechnique, Paris.
  3. 1932Simpson (1932) Journal of the Royal Society of Western Australia: 18: 61.
  4. 1943McConnell (1943) Geological Society of America Bulletin: 54: 707.
  5. 1951Palache, Charles; Berman, Harry; Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. John Wiley and Sons.
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Ferrian Variscite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/ferrian-variscite-25679},
  note      = {Accessed 2026-05-11}
}