calcite
A penny would scratch minerals with a lower hardness rating such as calcite, gypsum, or talc. Minerals like quartz or topaz would not be scratched by a penny because they are harder than the metal in a penny.
Between 3.5 and 5.5 on the Mohs scale of mineral hardness.
Diamonds are proven to scratch all minerals including itself.
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).
Diamond is the hardest naturally occurring mineral and can scratch all other minerals. Talc is the softest of minerals and cannot scratch any other mineral.
Minerals that can scratch apatite include fluorite, quartz, topaz, and corundum. These minerals have a higher hardness level than apatite on the Mohs scale, which allows them to scratch apatite.
A steel file can scratch minerals with a hardness of 6.5 or lower on the Mohs scale. This includes minerals such as gypsum, calcite, and fluorite.
Talc is the softest mineral on the Mohs scale with a hardness of 1, so it can be easily scratched by harder minerals. Talc can scratch over minerals with a lower hardness value, but it cannot scratch minerals that are harder than itself, such as quartz or diamond.
No because a coper penny is and quartz is 7 so any ting softer than 7 cannot scratch
Yes, other minerals can scratch hematite. Hematite has a hardness of 5.5-6.5 on the Mohs scale, so minerals with a higher hardness (like quartz or corundum) can scratch hematite.
no because fluorite is softer than a penny
Hardness of the dimond