Hibschite

Formula:  Ca₃Al₂(SiO₄)_3-x(OH)_4x  (x = 0.2 - 1.5)

Origin of name:  For Joseph Hibsch, Czech discoverer of mineral

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning: 

Unit cell: 

Colour:  Colourless or pale yellow

Diaphaneity:   Semitransparent

Luster: 

Habit:  As shells replacing Andradite and other minerals

Hardness:  6

Specific gravity:  3.07

Cleavage:  None

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Series with grossular and katoite