Glass can scratch apatite but not feldspar.
steel file 6.5
apatite
No it cant.
According to Mohs' Hardness Scale, talc registers at a 1, whilst feldspar registers at a 6, so, no, talc cannot scratch feldspar.
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.
Minerals that will scratch apatite must be more than a 5 on the Moh's hardness scale. So feldspar, quartz, topaz, corundum, and diamond will scratch apatite.
steel file 6.5
On the Mohs mineral hardness scale, calcite is about a 3, and apatite is about a 5. So, whatever is at a hardness of 4 will scratch a 3 but not a 5. That mineral is fluorite.
apatite
No it cant.
True
gypsum can
no
According to Mohs' Hardness Scale, talc registers at a 1, whilst feldspar registers at a 6, so, no, talc cannot scratch feldspar.
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.
topaz
quartz,talc,apatite,feldspar