Color - Each minerals may differ in color depending on the type of minerals contained. Some minerals like quartz display conchoidal fracture which looks sort of like the inside of an oyster smooth and curving. 3 Mineral Properties Mineralogy The physical properties of minerals include color hardness crystal form luster streak and cleavage. . Also impurities can also influence the color of minerals. 40 Questions Show answers. Color is the mineral property that is easily observed but can be unreliable when identifying minerals. There are many physical properties of minerals that are testable with varying degrees of ease including color crystal form or shape hardness luster or shine density and cleavage or fracture how the mineral breaks. The physical properties of minerals include color hardness crystal form luster streak and cleavage. Which of the following properties of a mineral can be observed directly. ...