Idrialite

Formula:  C₂₂H₁₄

Origin of name:  After locality; Idria (now Idrija), Slovenia

Crystal system:  Orthorhombic

Crystal class:  Unknown

Twinning: 

Unit cell: 

Colour:  Greenish yellow to light brown

Diaphaneity: 

Luster:  Vitreous to adamantine

Habit:  Crystals tabular, minute; flakes, six-sided or square

Hardness:  < 2

Specific gravity:  1.24

Cleavage:  1; basal perfect

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Fluoresces bluish white