Ellisite

Formula:   Tl3AsS3

Origin of name:   For A.J. Ellis, chemist from New Zealand

 

Crystal system:   Hexagonal

Crystal class:   3m

Twinning:

Unit cell: 

 

Colour:  Dark gray

Diaphaneity:  Opaque

Luster:   Metallic

Habit:   Grains, anhedral to irregular

Hardness:   2

Specific gravity:   7.10 to 7.18

Cleavage:   1; Rhombohedral, good to excellent

Tenacity: 

Streak:   Light brown with orange tint

 

Synonyms/varieties:

 

Comments:

 

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