No because a coper penny is and quartz is 7 so any ting softer
than 7 cannot scratch
No, quartz is harder than copper and can scratch it. However, a copper penny is typically made of a copper-zinc alloy that is harder than pure copper, so it might be more resistant to scratching by quartz but it is still possible.
The copper of the penny will rub off the file
A copper penny can scratch materials with a Mohs hardness of 2.5 or lower, such as gypsum, talc, and some plastics. It will not scratch harder materials like glass, steel, or most ceramics.
Copper. Copper has a hardness of 2.5-3 on the Mohs scale, while a steel knife generally has a hardness of around 5.5 - 6.5. This means that a steel knife can scratch copper, but a copper penny cannot scratch a steel knife.
The U.S. Mint did not make a nickel penny in 1977. If you have one it may be a regular penny with a coating or plating of some sort on it. Scratch the rim and see if there is copper underneath.
a penny has a hardness of 3 depending on what it is being scratched on.
Between 3.5 and 5.5 on the Mohs scale of mineral hardness.
Most igneous rocks are harder than a penny, so it is unlikely that a penny would be able to scratch an igneous rock. Igneous rocks are typically composed of minerals like quartz and feldspar, which have a higher hardness than copper (the main material in pennies).
The penny is made out of copper.
Copper
Copper pennies (95% copper, 5% zinc) weigh 3.11 grams. Modern zinc pennies (97.5% zinc, 2.5% copper) weigh 2.5 grams.
Copper can scratch fluorite because of the difference in their hardness levels, as measured on the Mohs scale. Fluorite has a hardness of 4, while copper has a hardness of around 3.5. Since a harder material can scratch a softer one, copper can easily scratch the surface of fluorite.