Formula: Ba(UO2)2(AsO4)2 . 8H2O
Origin of name: From Greek meta - after and heinrichite
Crystal system: Tetragonal
Crystal class: 4
Twinning:
Unit cell: a = 7.07 Å, c = 17.74 Å
Colour: Yellow to green
Diaphaneity:
Luster: Vitreous to pearly
Habit: Crystals tabular, to 1 mm
Hardness: 2,5
Specific gravity: 4.04
Cleavage: 2; {001} perfect, {100} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Fluoresces bright green to greenish yellow under SW and LW
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