apatite
There is no mineral that would satisfy the question. If a mineral is able to scratch feldspar, it would have a Mohs hardness of 6 or above. Fluorite is rated as a 4. It would be impossible for a mineral which scratches feldspar to be unable to scratch fluorite.
potassium feldspar
potassium feldspar
If by biggest, you mean the most common, no. The most common minerals are quartz and feldspar.
Fluorite is the number 4 mineral on the Mohs scale of mineral hardness, above calcite and below apatite.
There is no mineral that would satisfy the question. If a mineral is able to scratch feldspar, it would have a Mohs hardness of 6 or above. Fluorite is rated as a 4. It would be impossible for a mineral which scratches feldspar to be unable to scratch fluorite.
a diamond
potassium feldspar
potassium feldspar
Fluorite is unable to scratch feldspar, quartz, corundum, diamond, or any other mineral with a Mohs hardness greater than 4.
the answer is something harder than fluorite some examples are granite , magnetite , diamonds , and quartz .
Depending on the variety, feldspars can range from adamantine to glassy in luster.
If by biggest, you mean the most common, no. The most common minerals are quartz and feldspar.
Fluorite is a mineral.
Fluorite is the number 4 mineral on the Mohs scale of mineral hardness, above calcite and below apatite.
quartz
Between 2 and 4. Calcite, which has a hardness of 3, is one example.