15 · No streak
Quartz SiO₂
colourless to milky → none
no streak · Mohs 7 · harder than the plate
Whinstone Spoil · 2 March 2024
The key · sector
No streak
Harder than the plate. Above Mohs 6.5 a mineral does not powder against porcelain, it scratches it — there is nothing to read.
1 of 15 · no hue range
Other sectors