Tab 20. Specimen J has a. cleavnge in one plane. b. cleavage in two planes not a
ID: 154577 • Letter: T
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Tab 20. Specimen J has a. cleavnge in one plane. b. cleavage in two planes not at 90° angles. c. cleavage in three planes not at 90° angles d. cleavage in three planes at 90° angles. 21. Specimen J is a. magnetite. b. biotite. c. muscovite. d. pyrite. Fn 22. When a mineral breaks, it often does so along its plane or planes, which is known as a. luster. b. streak. c. hardness. d. cleavage. 23. What percentage of Earth's crust is composed of the mineral group, ilicates Earth silicates? a, 60% b. 70% . 80% d.90% 24. An example of a mineral composed of isolated tetrahedra is the gemstone peridot. Peridot is a member of the group, the largest group of minerals with isolated tetrahedron structure a. amphibole b. mica c. olivine d. pyroxene 25. The mineral structures composed of isolated tetrahedra have no planes of weakness, which means minerals such as garnet have no a. cleavage. b. luster. c. streak. d. color. Which mineral group is formed of double chains of silicon-oxygen tetrahedra? a. the olivine group b. the pyroxene group 26. c. the amphibole group d. the mica group 123 Scanned by CamScannerExplanation / Answer
Ans:
No. 20 and No. 21:Unable to answer as the picture of the specimen 'J' is not given here.
No. 22: Cleavage-Cleavage is the plane of weakness with in a mineral. Along the cleavage plane the mineral tends to break along a parallel surface due to weak chemical bonding.
No. 23: 90%-Oxygen and silicate are the most abundant element with in the erarth's crust. The earth's crust is composed of almost 90% silicate minerals.
No. 24: Peridot-Peridot is a magnessium rich variety of olivine group of minerals having formula MG2SiO4.
No. 25: Cleavage- Cleavage is the plane of weakness with in a mineral along which the mineral has a tendency to break. As garnet has no plane of weakness it will not have any cleavage.
No. 26: The Amhibole group-The amphibole group of minerals form a double chain silicate structure (Inosilicates) having oxigen and silicon structure of 4:11.
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