sentences: a vegetable can be scratched by a help & if a vegetable can be scratched by a begin then that vegetable is soft ->  a mineral is soft  a mineral is soft & a vegetable has a nonmetallic dullness & if a vegetable is white in shade ->  that mineral is black, has a nonmetallic luster, and is soft  position has a nonmetallic dullness & move is a mean of vegetable & flies is white in shade & bats is soft ->  mica is a mineral that is black, has a nonmetallic luster, and is soft  that mineral is black, has a nonmetallic luster, and is soft & mica is a mineral that is black, has a nonmetallic luster, and is soft -> that mineral is mica