ROCK EXAM REVIEW

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Author:
allieralston
ID:
109621
Filename:
ROCK EXAM REVIEW
Updated:
2011-10-30 15:17:49
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GEOLOGY LAB
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Description:
ROCK EXAM REVIEW- TYPES OF ROCKS, ROCK TERMS
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  1. Name of the igneous rock(s) that have a porphyritic aphanitic texture?
    Rhyolite and Andesite
  2. What is the best way to distinguish syenite from granite?
    Syenite has no quartz; Granite has quartz
  3. Why is scoria darker in color and pumice lighter in color?
    • Scoria is composed of ferromagnesium (mafic) elements
    • Pumice is composed of non-ferromagnesium (felsic) elements
  4. Why should scoria sink and pumice float?
    • Scoria is more dense due to ferromagesium elemental composition
    • Pumice is less dense because it is composed of non-ferromagnesium elements
  5. What is the origin of vesicular basalt? How do you know?
    Extrusive, the vesicules (holes) were produced by gases escaping from cooling lava
  6. What makes arkose appear "pinkish" in color?
    Presence of orthoclase
  7. You have two varieties of quartz sandstone, one is light colored, other is darker. What mineral gives darker quartz sandstone its color?
    • Iron-oxide minerals such as hematite and limonite gives the rock a darker color
    • The rock is referred to as a quartz sandstone because quartz is the predominant mineral
    • Iron-oxide minerals are the cement that holds the grains together
  8. What is the best way to distinguish siltstone from shale?
    Grain size: Siltstone is slighty gritty (silt-sized grains) and shale is smooth (clay-size grains)
  9. List two physical properties other than mineral composition that can be used to distinguish micrite from chert.
    • Micrite is softer than glass and reacts in HCL
    • Chert is harder than glass and does not react
  10. How do you distinguish slate from shale?
    Slate rings when tapped and powders a lighter color
  11. What metamorphic rock has a "satiny sheen"?
    Phyllite
  12. What metamorphic rocks have a "sugary luster"?
    Quartzite and Marble
  13. Marble and quartzite represent what type of "change"?
    Recystallization
  14. What are the parent rocks (protoliths) of metamorphic rocks; igneous rocks or sedimentary rocks?
    Any rock (igneous, sedimentary or metamorphic rocks) can serve as the protolith of metamorphic rocks
  15. Which type of rock has four different kinds of textures?
    phaneritic
    aphanitic
    glassy
    fragmental
    Igneous
  16. Which type of rock has two different kinds of texture?
    clastic
    crystalline
    sedimentary
  17. Foilated and non foilated are the different types of texture for WHICH type of rock?
    Metamorphic
  18. Igneous rocks are the only type of rock that has origins: what are they?
    • Extrusive
    • Intrusive
  19. Sedimentary rocks are classified by its type. What are the two types?
    • Detrital
    • Chemical Precipitate
  20. Additional info for igneous rocks: what else can you use to classify the rocks?
    • Porphyritic- texture (just two rocks that has it)
    • Phenocrysts
  21. types of changes for metamorphic rocks: what are they?
    • recrystallization
    • recombination
    • rotation
  22. Identify this mineral and its classification:
    • Andesite
    • Igneous
  23. Identify this rock and its classification:
    • Arkose
    • Igneous
  24. Identify this rock and its classification:
    • Basalt
    • Igneous
  25. Identify this rock and its classification:
    List three properties of this rock
    • Chalk
    • Sedimentary
    • Chemical Percipitate/ Organic
    • Mineral Composition: Calcite
    • Texture: Clastic
  26. Identify this rock and its classification:
    List three properties of this rock:
    Texture:
    Mineral Composition:
    • Chert
    • Sedimentary
    • Chemical Precipitate/ Organic
    • fine-grained silicia
    • Crystalline

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