Mellite

Formula:  Al2[C6(COO)6] . 16H2O

Origin of name:  From Greek for honey

 

Crystal system:  Tetragonal

Crystal class:  4/m 2/m 2/m

Twinning: 

Unit cell: 

 

Colour:  Golden brown or brownish, reddish, yellow

Diaphaneity:  Transparent to translucent

Luster:  Vitreous to resinous

Habit:  Crystals prismatic or pyramidal, small, rare; massive, fine granular; nodular; coatings

Hardness:  2 to 2.5

Specific gravity:  1.64

Cleavage:  1; {011} indistinct

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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