Hokkaidoite

Where it forms, where it's found

Type locality: Shikaribetsu Lake
Shikaoi (Shikaoi-Chō)
Kato District
Tokachi Subprefecture
Hokkaidō Prefecture
Japan
43.2761°, 143.1158°

2recorded occurrences

Source · OpenStreetMap

Crystallography

Crystal system: Monoclinic
Space group: P21/c
Cell parameters: a = 9.8422(9) Å · b = 11.866(5) Å · c = 11.722(2) Å
Cell angles: β = 98.76(1) °
Ratio a:b:c: 1 : 1.206 : 1.191

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
6CCarbon Carbon 22 12.011 264.242
95.62%
1HHydrogen Hydrogen 12 1.008 12.096
4.38%
Total 276.338 100.00%
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
6CCarbon	Carbon	22	12.011	264.242	95.62%
1HHydrogen	Hydrogen	12	1.008	12.096	4.38%
	Total	276.338	100.00%

Synonyms

Hokkaidoiet

In other languages

German: Hokkaidoit · IMA 2022-104
Japanese: hokkaidoite · 北海道石
Chinese: 北海道石

Classification

Strunz

10th ed.

10.B0

10Organic CompoundsClass
10.BHydrocarbonsDivision
10.B0— unnamed intermediate level —Group
10.B0HokkaidoiteSpecies

Literature, links & citation

Citations

2023Bosi, Ferdinando; Miyawaki, Ritsuro; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. (2023) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 71. European Journal of Mineralogy, 35 (1). 75-79 doi:10.5194/ejm-35-75-2023 DOI: 10.5194/ejm-35-75-2023

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Hokkaidoite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/hokkaidoite-470614},
  note      = {Accessed 2026-05-11}
}