How hard is Quartz on the Mohs scale?

7 – lower in impure varieties (defining mineral).

What luster does Quartz have?

Vitreous – waxy to dull when massive.

α-quartz: trigonal, β-quartz: hexagonal.

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

Quartz: hardness, streak, luster and crystal system
Mineral	Mohs hardness	Luster	Streak	Crystal system
Quartz	7 – lower in impure varieties (defining mineral)	Vitreous – waxy to dull when massive	White	α-quartz: trigonal, β-quartz: hexagonal

How hard is Quartz on the Mohs scale?: 7 – lower in impure varieties (defining mineral).
What luster does Quartz have?: Vitreous – waxy to dull when massive.
What colour is the streak of Quartz?: White.
What crystal system does Quartz have?: α-quartz: trigonal, β-quartz: hexagonal.