Rengeite

Formula: Sr₄ZrTi₄Si₄O₂₂

Origin of name: Named for Mt Renge, near the discovery location and the jadeite-bearing Renge metamorphic belt.

Crystal system: Monoclinic

Crystal class: 2/m

Twinning: 

Unit cell: a = 13.97, b = 5.675, c = 11.98, β = 114.26°

Colour: Dark greenish brown

Diaphaneity: Transparent

Luster: Adamantine

Habit: Microscopic grains, anhedral

Hardness: 5-5.5

Specific gravity: 

Cleavage: None

Tenacity: Brittle

Streak: Pale greenish brown

Synonyms/varieties:

Comments: