Redondite

Where it forms, where it's found

1recorded occurrences

Source · OpenStreetMap

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 6 15.999 95.994
60.76%
15PPhosphorus Phosphorus 1 30.974 30.974
19.61%
13AlAluminium Aluminium 1 26.982 26.982
17.08%
1HHydrogen Hydrogen 4 1.008 4.032
2.55%
Total 157.982 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From Mindat formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
8OOxygen	Oxygen	6	15.999	95.994	60.76%
15PPhosphorus	Phosphorus	1	30.974	30.974	19.61%
13AlAluminium	Aluminium	1	26.982	26.982	17.08%
1HHydrogen	Hydrogen	4	1.008	4.032	2.55%
	Total	157.982	100.00%

In other languages

German: Redondit
Italian: redondite

Classification

Strunz

10th ed.

8.CB.X

8Phosphates, Arsenates, VanadatesClass
8.CPhosphates without additional anions, with H₂ODivision
8.CBWith only medium-sized cations, RO₄:H₂O = 1:1Group
8.CB.XRedonditeSpecies

Literature, links & citation

Citations

1869Shepard (1869) American Journal of Science: 47: 428.
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     = {Redondite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/redondite-27199},
  note      = {Accessed 2026-05-11}
}