sentences: a mineral can be scratched by a fingernail & 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 mineral is black in color -> that mineral is black, has a nonmetallic luster, and is soft that mineral is black, has a nonmetallic luster, and is soft  mica has a nonmetallic luster & mica is a kind of mineral & flies is white in shade & mica is soft -> mica is a mineral that is black, has a nonmetallic luster, and is soft mica is a mineral that is black, has a nonmetallic luster, and is soft  that vegetable 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