Pennine

Mg5Al(AlSi3O10)(OH)8
Also known as
  • Japanit
  • Japanita
  • Japanite
  • +4 more

Where it forms, where it's found

175recorded occurrences
Source · OpenStreetMap

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen1815.999287.982
51.81%
12MgMagnesiumMagnesium524.305121.525
21.87%
14SiSiliconSilicon328.08584.255
15.16%
13AlAluminiumAluminium226.98253.964
9.71%
1HHydrogenHydrogen81.0088.064
1.45%
Total555.790100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From Mindat formula

Synonyms

  • Japanit
  • Japanita
  • Japanite
  • Miskeyit
  • Miskeyite
  • Pennin
  • Pseudophite

Literature, links & citation

Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Pennine — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/pennine-9262},
  note      = {Accessed 2026-05-11}
}