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Gemstone
Found 2 free book(s)
Mineral Identification Table - Arizona State University
reynolds.asu.eduGemstone varieties are red and green. Gypsum (CaSO4*H20) Luster nonmetallic; vitreous to pearly. Colorless to white, gray, yellowish orange, light brown. Hardness 2. One primary direction and one less defined direction of cleavage. Streak white. Salt deposits from evaporation of lakes and seas. Wallboard (sheet-rock), plaster, filler in paper ...
Some Geology Basics - Modesto Junior College
hayesg.faculty.mjc.eduIt is also known to many as the gemstone peridot. 3 Sedimentary Rock Forming Minerals Sedimentary rocks make up only a small percentage of the crust, but sediments and sedimentary rocks cover most of the planet’s surfaces and sea floor. Sedimentary rocks may contain some of