How hard is Kyanite on the Mohs scale?

4.5–5 parallel to one axis, 6.5–7 perpendicular to that axis.

Kyanite: hardness, streak, luster and crystal system

The properties that identify Kyanite: its Mohs hardness, luster, streak colour and crystal system.

Kyanite: hardness, streak, luster and crystal system
Mineral	Mohs hardness	Luster	Streak	Crystal system
Kyanite	4.5–5 parallel to one axis, 6.5–7 perpendicular to that axis	Vitreous to white	White	Triclinic

How hard is Kyanite on the Mohs scale?: 4.5–5 parallel to one axis, 6.5–7 perpendicular to that axis.
What luster does Kyanite have?: Vitreous to white.
What colour is the streak of Kyanite?: White.
What crystal system does Kyanite have?: Triclinic.