Hartite

Formula: C₂₀H₃₄

Origin of name: For the type locality, Hart, Gloggnitz, Lower Austria, Austria

Crystal system: Triclinic

Crystal class: 1

Twinning: 

Unit cell: a = 11.407, b = 20.952, c = 7.406, α = 93.941°, β = 100.75°, γ = 80.499°

Colour: Colourless, yellow, white

Diaphaneity: Transparent to translucent

Luster: Waxy to vitreous

Habit: Complex flattened to needlelike crystals to 8 mm (26 forms noted), lamellar to coarse crystalline masses or coatings

Hardness: 1

Specific gravity: 1.036-1.06

Cleavage: 1 Good

Tenacity: Waxy

Streak: White

Synonyms/varieties:

Comments:  A diterpene hydrocarbon