what are the physical properties of zincite?
['Lustre: Sub-Vitreous, Resinous, Waxy, Greasy, Silky, Dull, Earthy.', 'Transparency: Transparent, Translucent, Opaque.', 'Comment: Found in a wide variety of textures.', 'Colour: Red, orange, yellow, white; rarely green.', 'Streak: Orange-yellow.', 'Hardness: 4 on Mohs scale.', 'Tenacity: Brittle.', 'Cleavage:']