Formula: MgB3O3(OH)5 . 5H2O
Origin of name: For N. Kurnakov, Russian mineralogist and chemist
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell: a = 8.22 Ǻ, b = 10.51 Ǻ, c = 6.35 Ǻ, α = 96.6°, β = 106.1°, γ = 106.0°
Colour: Colourless, may have white surface alteration
Diaphaneity: Transparent
Luster: Vitreous, pearly on cleavage
Habit: Crystals, blocky, large; cleavable masses; dense granular aggregates
Hardness: 3
Specific gravity: 1.83
Cleavage: 2; {110} good, {001} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with inderite
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