Risörite

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
73TaTantalum Tantalum 1 180.948 180.948
25.49%
68ErErbium Erbium 1 167.259 167.259
23.56%
8OOxygen Oxygen 8 15.999 127.992
18.03%
41NbNiobium Niobium 1 92.906 92.906
13.09%
39YYttrium Yttrium 1 88.906 88.906
12.52%
22TiTitanium Titanium 1 47.867 47.867
6.74%
1HHydrogen Hydrogen 4 1.008 4.032
0.57%
Total 709.910 100.00%
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
73TaTantalum	Tantalum	1	180.948	180.948	25.49%
68ErErbium	Erbium	1	167.259	167.259	23.56%
8OOxygen	Oxygen	8	15.999	127.992	18.03%
41NbNiobium	Niobium	1	92.906	92.906	13.09%
39YYttrium	Yttrium	1	88.906	88.906	12.52%
22TiTitanium	Titanium	1	47.867	47.867	6.74%
1HHydrogen	Hydrogen	4	1.008	4.032	0.57%
	Total	709.910	100.00%

Synonyms

Risörit
Risörita

Literature, links & citation

Citations

1907Hauser (1907), Ber.: 40: 3118.
1908Hauser, O. (1908): Risörit ein neues Mineral. Zeitschrift für anorganische Chemie, 60: 230-236
1926Barth, Tom. F.W (1926) The Structure of Risørite. Norsk Geologisk Tidsskrift [Norwegian Journal of Geology], 9 (1) 37-39
1930Machatschki, Felix (1930) Über die Formel des Risörites und Fergusonites. Zeitschrift für Kristallographie, Mineralogie und Petrographie, 72 (1-6). 291-300 doi:10.1524/zkri.1930.72.1.291DOI: 10.1524/zkri.1930.72.1.291
1944Palache, Charles, Berman, Harry, Frondel, Clifford (1944) The System of Mineralogy (7th ed.) Vol. 1 - Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, New York.

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Risörite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/risorite-10054},
  note      = {Accessed 2026-05-11}
}