Formula: (Cu,Fe)12As4S13
Origin of name: for Smithson Tennant, British chemist
Crystal system: cubic
Crystal class: -43m
Twinning: on {111} contact or penetration
Unit cell: a = 10.19 Å
Colour: steel-gray to iron-black
Diaphaneity:
Luster: metallic, sometimes splendent
Habit: crystals tetrahedral, often modified, twinned, massive, coarse granular to compact
Hardness: 3 to 4.5
Specific gravity: 4.59 to 4.75
Cleavage: none
Tenacity: subconchoidal to uneven, brittle
Streak: black to brown
Synonyms/varieties: binnite, fahlerz, fahlore
Comments: series with tetrahedrite and with freibergite
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