Hello, Fleming College. We have a rock and mineral ID test coming up, and we have 40 rocks and minerals on there. There are 21 minerals and 19 rocks, so let's get down to business. First, let's talk about our minerals. Quartz has a hardness of seven and is the hardest mineral in this set. Its luster is glassy and nonmetallic, but be careful because quartz can be almost any color. It has a conchoidal fracture and no cleavage, but is sometimes found in crystal form. It has sharp edges and is a common rock-forming mineral. Next, we have calcite. It has a hardness of three and can be scratched with a knife. Its luster is vitreous to earthy and nonmetallic. It has good cleavage and is rhombic. Calcite can be many different colors and fizzes with a dilute 10% HCL. Plagioclase has a hardness of six and a nonmetallic luster. It streaks white and has good cleavage at right angles and twinning striations. It's usually light in color, white or gray. Orthoclase has a hardness of six. Its luster is nonmetallic and vitreous. It streaks white and has good cleavage at 90 degrees. Colors most often light to medium red, but can also be white, gray, or green. Now onto biotite and muscovite. They both have a hardness of two and a half to three, making them very soft. Their luster is nonmetallic, and they have perfect basal cleavage, splitting off easily into thin sheets that are elastic or plastic. Biotite is always black, while muscovite is brown, light green, or beige. Hornblende has a hardness of five and a half, as hard as a knife. Its luster is vitreous and nonmetallic, and it has a bright black splintery appearance. Its cleavage is not always easy to see at...
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