Shojiite

Where it forms, where it's found

Type locality: Mamushinosawa Creek
Shibetsu City
Kamikawa Subprefecture
Hokkaidō Prefecture
Japan
44.0869°, 142.2061°

1recorded occurrences

Source · OpenStreetMap

Crystallography

Crystal system: Monoclinic
Space group: C2/m
Cell parameters: a = 9.7912(5) Å · b = 17.9438(9) Å · c = 5.2721(3) Å
Cell angles: β = 103.548(5) °
Ratio a:b:c: 1 : 1.833 : 0.538

Chemical composition

Constituent elements: Mass composition breakdown
Element Atoms At. mass g/mol Mass g/mol Mass share
8OOxygen Oxygen 24 15.999 383.976
47.85%
14SiSilicon Silicon 8 28.085 224.680
28.00%
12MgMagnesium Magnesium 6 24.305 145.830
18.17%
11NaSodium Sodium 2 22.990 45.980
5.73%
1HHydrogen Hydrogen 2 1.008 2.016
0.25%
Total 802.482 100.00%
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	24	15.999	383.976	47.85%
14SiSilicon	Silicon	8	28.085	224.680	28.00%
12MgMagnesium	Magnesium	6	24.305	145.830	18.17%
11NaSodium	Sodium	2	22.990	45.980	5.73%
1HHydrogen	Hydrogen	2	1.008	2.016	0.25%
	Total	802.482	100.00%

Synonyms

Shojiiet

In other languages

German: Shojiit

Classification

Strunz

10th ed.

9.DE

9SilicatesClass
9.DInosilicatesDivision
9.DEInosilicates with 2-periodic double chains, Si₄O₁₁; ClinoamphibolesGroup
9.DEShojiiteSpecies

Literature, links & citation

Citations

—Hamada, M., Ejima, T., Hasebe, N., Mizukami, T., Ishii, A., Okamoto, K., Nagashima, M., Tamura, A. and Morishita, T. (2025) Shojiite, IMA 2024-023a. CNMNC Newsletter 87, Mineralogical Magazine, 89, https://doi.org/..

Cite this entry

@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Shojiite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/shojiite-494663},
  note      = {Accessed 2026-05-11}
}