Formula: Na2KMn2LiV2Si8O24
Origin of name: Based on being the vanadium analogue of mangan-neptunite, named after Watatsumi (or Wadatsumi), a Japanese sea god, analogous to Neptune in European mythology.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 16.45, b = 12.492, c = 9.995, β = 115.32°
Colour: Yellow green, peridot green
Diaphaneity: Translucent
Luster: Vitreous
Habit:
Hardness: 5.5-6
Specific gravity: 3.26 (calculated)
Cleavage: {110} poor/indistinct
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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