Paracelsian

Formula: BaAl₂Si₂O₈

Origin of name: from Greek para = similar and celsian

Crystal system: monoclinic

Crystal class: 2/m

Twinning: 

Unit cell: 

Colour: colourless

Diaphaneity: transparent

Luster: vitreous

Habit: crystals prismatic, often resembles topaz

Hardness: 6

Specific gravity: 3.31

Cleavage: 1; {110} poor

Tenacity: 

Streak: 

Synonyms/varieties:

Comments: dimorphous with celsian