Moiraite

Where it forms, where it's found

Type locality: Madoc Township
Hastings County
Ontario
Canada

Safety & handling

Crystallography

Crystal system: Triclinic
Space group: #2
Cell parameters: a = 8.3726(2) Å · b = 15.8995(4) Å · c = 23.2249(6) Å
Cell angles: α = 96.897(2) ° · β = 90.015(2) ° · γ = 89.624(2) °
Ratio a:b:c: 1 : 1.899 : 2.774

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
82PbLead Lead 12 207.200 2486.400
47.69%
16SSulfur Sulfur 36 32.060 1154.160
22.14%
51SbAntimony Antimony 8 121.760 974.080
18.68%
33AsArsenic Arsenic 8 74.922 599.376
11.49%
Total 5214.016 100.00%
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
82PbLead	Lead	12	207.200	2486.400	47.69%
16SSulfur	Sulfur	36	32.060	1154.160	22.14%
51SbAntimony	Antimony	8	121.760	974.080	18.68%
33AsArsenic	Arsenic	8	74.922	599.376	11.49%
	Total	5214.016	100.00%

Synonyms

IMA2024-028
Moiraiet

In other languages

German: IMA 2024-028 · Moirait

Classification

Strunz

10th ed.

2.HC

2Sulfides and SulfosaltsClass
2.HSulfosalts of SnS archetypeDivision
2.HCWith only PbGroup
2.HCMoiraiteSpecies

Literature, links & citation

Citations

2024Welch, M. D., Najorka, J., Kleppe, A. K., Kampf, A. R., Spratt, J. (2024) Nancyrossite, IMA 2024-033, in IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 81. European Journal of Mineralogy, 36 (5). 917-923 doi:10.5194/ejm-36-917-2024DOI: 10.5194/ejm-36-917-2024

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Moiraite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/moiraite-471427},
  note      = {Accessed 2026-05-11}
}