Tungstenite

Formula: WS₂

Origin of name: From composition

Crystal system: Hexagonal

Crystal class: 6/m 2/m 2/m

Twinning:

Unit cell: a = 3.154, c = 12.362

Colour: Lead-gray

Diaphaneity: Opaque

Luster: Metallic, earthy, dull

Habit: Massive, feathery or fine scaly aggregates

Hardness: 2.5

Specific gravity: 7.75

Cleavage: 1; {0001}

Tenacity: Sectile

Streak: Lead-gray

Synonyms/varieties:

Comments: Besides tungstenite-2H there is also a tungstenite-3R polytype