Hi spinel has a hardness of 8 on mohs scale and magnetite is 51/2 to 6 1/2 so it is a lot softer
quartz hardness is 7 so should be able to make some form or mark if it was magnetite on a scratch test. Ruby hardness of 9 would make some mark on spinel?? the stone on the left certainly has the look of a spinel crystal and the top one I cannot see that well but it looks like a trigon on the crystal face, spinel crystals do have trigons on the crystal face , not sure if magnetite has trigons on the crystal face. thanks
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