Final answer:
Two common minerals, quartz and feldspar, are described in terms of their color, cleavage, hardness, and luster. Quartz has a variety of colors, no cleavage, a hardness of 7, and a non-metallic luster. Feldspar is commonly white, pink, or gray, has 90-degree cleavage, a hardness of 6, and a non-metallic luster. Both minerals belong to the silicate mineral class and are formed through different geological processes.
Step-by-step explanation:
Two common minerals are quartz and feldspar.
- Quartz: Color - Quartz can come in various colors. It can be transparent, white, pink, purple, or even black. Cleavage - Quartz has no cleavage as it does not break along distinct planes. Hardness - Quartz has a hardness of 7 on the Mohs scale, which means it can scratch glass. Luster - Quartz has a non-metallic luster, which means it does not look like a metal.
- Feldspar: Color - Feldspar can be white, pink, or gray. Cleavage - Feldspar has two cleavage directions at 90 degrees. Hardness - Feldspar has a hardness of 6 on the Mohs scale. Luster - Feldspar has a non-metallic luster.
Both quartz and feldspar are part of the silicate mineral class. Quartz is formed through the crystallization of magma or the recrystallization of quartz-rich rocks, while feldspar is formed through the cooling and crystallization of magma or the alteration of pre-existing rocks.