Tellurium

Formula: Te

Origin of name: from composition, from Latin tellus = the earth

Crystal system: Hexagonal

Crystal class: 32

Twinning:

Unit cell: a = 4.46 Å, c = 5.93 Å

Colour: tin-white, grayish white, white

Diaphaneity: Opaque

Luster: Metallic

Habit: Crystals prismatic to acicular, small, massive, columnar to fine granular

Hardness: 2 to 2.5

Specific gravity: 6.1-6.3

Cleavage: 2; {10-10} perfect, {0001} imperfect

Tenacity: Somewhat brittle

Streak: Grayish white, gray

Synonyms/varieties:

Comments:  selen-tellurium