Roepperite (of Brush)

Where it forms, where it's found

Geological setting: Highly metamorphosed marble-hosted zinc deposit

3recorded occurrences

Source · OpenStreetMap

Physical

Hardness: 1Talc
2Gypsum
3Calcite
4Fluorite
5Apatite
6Orthoclase
7Quartz
8Topaz
9Corundum
10Diamond
Transparency: Translucent · Opaque
Colour: Black · greenish black · rarely dark yellow green
Tenacity: brittle
Cleavage: Very Good
(010)
Density: 3.95 g/cm³

Optical

UV response: Not fluorescent in UV

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
30ZnZinc Zinc 2 65.380 130.760
29.42%
26FeIron Iron 2 55.845 111.690
25.13%
25MnManganese Manganese 2 54.938 109.876
24.73%
8OOxygen Oxygen 4 15.999 63.996
14.40%
14SiSilicon Silicon 1 28.085 28.085
6.32%
Total 444.407 100.00%
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
30ZnZinc	Zinc	2	65.380	130.760	29.42%
26FeIron	Iron	2	55.845	111.690	25.13%
25MnManganese	Manganese	2	54.938	109.876	24.73%
8OOxygen	Oxygen	4	15.999	63.996	14.40%
14SiSilicon	Silicon	1	28.085	28.085	6.32%
	Total	444.407	100.00%

Literature, links & citation

Citations

—Roepper, William Theodore, 1870, Notice of Some Minerals from New Jersey, American Journal of Science, second series, v. 50, p. 35-38.
—Brush, George Jarvis, 1872, Roepperite, System of Mineralogy, fifth edition,Appendix I, p. 13.
—Brush, George Jarvis, 1872, Stirlingite, Roepperite, American Journal of Science, third series, v4, p. 146.

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Roepperite (of Brush) — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/roepperite-of-brush-43736},
  note      = {Accessed 2026-05-11}
}