Yes. It is much harder than your fingernail.
no
Feldspar can be found in many things, including soap
granite
Go to an area nearby a formerly active volcano and you will find feldspar, because it is an igneous rock. Or you can go to an area such as Yellowstone Park where there are open rock areas and you will be sure to find feldspar.
Granite is a rock containing both amphibole and potassium feldspar.
They are all found in Granite
potassium feldspar
Quartz
potassium feldspar
potassium feldspar
Yes!!! The allotrope ' yellow flowers of sulphur' is quite soft and can be scratched with a finger nail.
yes it can be scratched by certain things
Yes.
Yes
yes itt can
It would have to be 5.0 because glass has a hardness of 5.5 and an iron nail has the hardness of 4.5
quartz
It can be scratched by a diamond, corundum, topaz, and quartz.