Suppose you have an unknown mineral sample. You can scratch the mineral with a pen knife but not with your fingernail. The mineral is most likely

a. talc
b. diamond
c. apatite
d.gypsum

Question

Suppose you have an unknown mineral sample. You can scratch the mineral with a pen knife but not with your fingernail. The mineral is most likely

  a. talc 
  b. diamond 
   c. apatite 
   d.gypsum

anonymous · Answer

attachment

zale101 · Answer

so from the pic you showed, 
Talc and gypsum can be scratched with finger nails easily
diamond is so hard it can never be scratched with a pen knife
apatite can be scratched with a pen knife
so apatite is the answer

anonymous · Answer

What is the texture of SAMPLE 10?
a. aphanitic 
b.  phaneritic 
c.  neither