Binghamite

Where it forms, where it's found

1recorded occurrences

Source · OpenStreetMap

Physical

Colour: Yellowish to reddish

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 2 15.999 31.998
53.26%
14SiSilicon Silicon 1 28.085 28.085
46.74%
Total 60.083 100.00%
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	2	15.999	31.998	53.26%
14SiSilicon	Silicon	1	28.085	28.085	46.74%
	Total	60.083	100.00%

Synonyms

American Tiger Eye
Binghamit
Binghamita
Cuyunite

Literature, links & citation

Citations

1963Schmidt, R.G. (1963) Geology and ore deposits of the Cuyuna North Range, Minnesota: U.S. Geological Survey Professional Paper 407, 96 p.
1989Kammerer, J.(1989) Binghamite and silkstone: Minnesota's unique gemstones, Lapidary Journal:43(5): 50-53.
2003Heaney, Peter J., Fisher, Donald M. (2003) New interpretation of the origin of tiger's-eye. Geology, 31 (4) 323 doi:10.1130/0091-7613(2003)031<0323:niotoo>2.0.co;2DOI: 10.1130/0091-7613(2003)031<0323:niotoo>2.0.co;2

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Binghamite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/binghamite-7622},
  note      = {Accessed 2026-05-11}
}