Earth Science

2. a substance obtained by mining
4. occurs when particles such as sand rub against the surface of rocks
10. type of texture characterized by a rock being pitted with many cavities
11. type of rock formed from the solidification of lava on or above the surface
12. a dark-colored, fine-grained, igneous rock composed mainly of plagioclase and pyroxene minerals
14. is a texture having large crystals in a fine groundmass of minerals
15. the act of splitting along definite planes
17. a coarse-grained granite, sometimes rich in rare elements such as uranium, tungsten, and tantalum
19. the way a crystal reflects light

1. measurement of how easily a mineral may be scratched
3. a high-quality, clear, colorless glass
5. most common measurement of density used by geologists
6. kind of crystallization is a process by which a chemical compound is separated into components by crystallization
7. to break minerals with rough edges
8. the city where the intrusions were first identified
9. is the size, shape, and arrangement of the grains
13. a very hard, granular, crystalline, igneous rock consisting mainly of quartz, mica, and feldspar and often used as a building stone
14. type of melting occurs when only a portion of a solid is melted
16. type of rock formed through the cooling and solidification of magma or lava
18. color of a mineral when it is broken up and powdered