Formula: BaCa(CO3)2
Origin of name: from Greek para = similar and alstonite
Crystal system: hexagonal
Crystal class: 32
Twinning:
Unit cell:
Colour: colourless to smoky white
Diaphaneity:
Luster:
Habit: crystals pyramidal, smaller than 1 mm
Hardness: 4 to 4.5
Specific gravity: 3.60
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: trimorphous with alstonite and barytocalcite
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