GEO 214 field trip

3. pyroclastic fragments that are between 2-64 mm diameter
4. This is critical to melting of the asthenosphere at subduction zones
6. a concordant intrusive body, typically of viscous magma with an arched roof and flat floor
8. who came up with the rules that predict the crystal structures of ionic compounds?
11. the texture describing a rock that has visible plagioclase grains up to 1cm in length in an aphanitic matrix
12. Difference of the maximum and minimum indices of refraction in an anisotropic material
13. because of their low density, volatiles will concentrate in the _____ part of a shallow magma chamber
15. undifferentiated meteorites thought to best represent the primitive earth mantle
17. an adjective describing rocks that are made up primarily of silicate minerals that are light-colored and relatively silica-rich
18. This igneous rock is made up of mostly plagioclase and clinopyroxene
19. the rigid layer above the asthenosphere

1. This decreases with increasing temperature, increasing crystallization and increasing SiO2 content
2. a very coarse-grained igneous rock characterized by large, interlocking crystals, often exceeding 1 cm in size
5. normal faulting and rift valleys are common at this type of plate boundary
7. This type of eruption is characterized by a sustained vertical column of ash that can reach 45 km into the stratosphere
8. the texture of a rock in which the majority of crystals are visible to the naked eye
9. the proportion of the material mined that is the actual ore mineral (or elemental metal) to be extracted from it expressed as a percentage
10. a lithium aluminum mineral (LiAlSi2O6) that's a key source of lithium, used in ceramics, glass, and especially for producing lithium chemicals like lithium carbonate and hydroxide for batteries
14. This is the typical Coordination number for Silica ions
16. boundary between crust and mantle