It crystallises in the 4th (rhombic) system, and its lustre is vitreous.
The ice was black and clear and vitreous on the forest pools.
The vitreous body plays a part in the refraction of the light.
The sulphate is, in this case, charged with vitreous electricity.
His striated eyeballs had a vitreous look; they were as hard as marbles.
The air was of the same biting ...