Ramosite

Where it forms, where it's found

Type locality: Uchucchacua Mine
Uchucchacua area
Oyón District
Oyón Province
Lima
Peru
-10.6231°, -76.6883°

1recorded occurrences

Source · OpenStreetMap

Safety & handling

Crystallography

Crystal system: Monoclinic
Cell parameters: a = 5.82 Å · b = 5.92 Å · c = 17.65 Å
Cell angles: β = 99.1 °
Ratio a:b:c: 1 : 1.017 : 3.033
Comment: Cell Parameters for Q-slab; Spacegroup: C2∕m (Q-slab), P21 (H-slab)(CNMNC Newsletter 53)

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
82PbLead Lead 25.7 207.200 5325.040
58.66%
16SSulfur Sulfur 56.2 32.060 1801.772
19.85%
50SnTin Tin 8.3 118.710 985.293
10.85%
51SbAntimony Antimony 6.4 121.760 779.264
8.58%
25MnManganese Manganese 3.4 54.938 186.789
2.06%
Total 9078.158 100.00%
Mass share = atoms × atomic mass ÷ molar mass × 100
From IMA formula

Mass composition breakdown
Element	Atoms	At. mass g/mol	Mass g/mol	Mass share
82PbLead	Lead	25.7	207.200	5325.040	58.66%
16SSulfur	Sulfur	56.2	32.060	1801.772	19.85%
50SnTin	Tin	8.3	118.710	985.293	10.85%
51SbAntimony	Antimony	6.4	121.760	779.264	8.58%
25MnManganese	Manganese	3.4	54.938	186.789	2.06%
	Total	9078.158	100.00%

Synonyms

IMA2019-099
Ramosiet

In other languages

German: IMA 2019-099 · Ramosit

Classification

Strunz

10th ed.

2.HF

2Sulfides and SulfosaltsClass
2.HSulfosalts of SnS archetypeDivision
2.HFWith SnS and PbS archetype structure unitsGroup
2.HFRamositeSpecies

Group, growth & confusion

2 members

Literature, links & citation

Citations

2020Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2020) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 53. European Journal of Mineralogy, 32 (1) 209-213 doi:10.5194/ejm-32-209-2020 DOI: 10.5194/ejm-32-209-2020
2022(2022) Ramosite. Handbook of Mineralogy. Mineralogical Society of America

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Ramosite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/ramosite-54278},
  note      = {Accessed 2026-05-11}
}