Penelope is adding fractions while taking a math test. which part of her brain is at work

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?

Me the formula cacl2 represents the compound