Yttroepidote

Where it forms, where it's found

4recorded occurrences

Source · OpenStreetMap

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 13 15.999 207.987
31.46%
39YYttrium Yttrium 2 88.906 177.812
26.90%
14SiSilicon Silicon 3 28.085 84.255
12.75%
20CaCalcium Calcium 2 40.078 80.156
12.13%
26FeIron Iron 1 55.845 55.845
8.45%
13AlAluminium Aluminium 2 26.982 53.964
8.16%
1HHydrogen Hydrogen 1 1.008 1.008
0.15%
Total 661.027 100.00%
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	13	15.999	207.987	31.46%
39YYttrium	Yttrium	2	88.906	177.812	26.90%
14SiSilicon	Silicon	3	28.085	84.255	12.75%
20CaCalcium	Calcium	2	40.078	80.156	12.13%
26FeIron	Iron	1	55.845	55.845	8.45%
13AlAluminium	Aluminium	2	26.982	53.964	8.16%
1HHydrogen	Hydrogen	1	1.008	1.008	0.15%
	Total	661.027	100.00%

Synonyms

Yttrian epidote

Literature, links & citation

Citations

1959Mineev, D.A. (1959): REE-epidote from pegmatites of Middle Ural. Doklady AN SSSR, 127, №4, xx-xx.

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Yttroepidote — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/yttroepidote-42507},
  note      = {Accessed 2026-05-11}
}