because quartz is an abrasive and abrasive is used in cleaning
Talc is a very soft mineral, unlike quartz, and so is less likely to be abrasive.
Water, simple soap, food coloring, non-bleach scouring powder, non-deoderizing clay cat litter
The material used to manufacture piezoelectric crystals is quartz. Wrist-watch crystals are often made of quartz. Quartz is a transparent mineral. The statement "There are four quartz in an imperial gallon" is faulty, and logically meaningless.
Quartz
There are countless uses for quartz. The colorful transparent varieties are polished into gems. Opaque varieties are processed into ornamental items or building materials. Very pure quartz sand deposits are mined for the many items that use silicon, like computer chips.
iron
Scouring Powder is an abrasive substance used in cleaning.
In my childhood one used wet wood ash as a scouring powder.
Materials which are used for scouring are known as abrasives. Please see the related link.
Quartz is a highly abundant material and has been used in a plenty of applications. Powdered quartz is used in making porcelain, scouring soaps, sandpaper, and wood fillers. Because it is a primary ingredient in sand it is also used to make glass & labware, silica brick, cement, and mortar. Ground quartz is used as an abrasive in stonecutting, sandblasting, and glass grinding. We are the leading Quartz Powder manufacturers in india.
dolomite
Quartz powder is dangerous to the respiratory system.
The most likely answer is pumice, an abrasive volcanic rock that has been used for millennia for various cleansing and scouring chores. E.g., it's found in Lava soap, and obviously gave the soap its name.
A scouring pad is a pad used to scour something
it is crushed into sand like powder by hammers.
You can try using a normal scouring pad. Another possibility would be to use a ball of aluminum foil, just wad it up and rub. A dishcloth with some minor abrasive, such as scouring powder or baking powder will work, but avoid damaging the surface.
Talc is a very soft mineral, unlike quartz, and so is less likely to be abrasive.