Plutonic

Used for lab “Identification of Stone Hand Specimens”

1. Connecticut bluestone
   Fine quartz sandstone. Note faint cross-stratification
2. Black slate
   Note lineation, minute flakes of white mica
3. Connecticut bluewater stone
   Fine quartz sandstone
4. Quartzite flagstone
   Quartz-mica schist. Note flattened grains
5. Tan Arizona flagstone
   Finely laminated
6. Lava stone
   Vesicular basalt. Are vesicles connected?
7. Red Arizona flagstone
   Fine quartz grains are coated with iron oxide
8. Azure marble
   Quartzite. Individual grains are discernible. Is it metamorphic?
9. Pumice
   Frothy glass. Note layering. Will it float?
10. Granite
    Gray feldspar, glassy quartz, dark pyroxene, interlocking grains
11. Rose quartzite
    Note lack of cleavage and lack of crystal faces
12. White quartzite
13. Yellow marble
    Dolomitic.
14. White dolomite
    Is it dolomite or quartzite?
15. Indiana limestone
    Rich in microscopic fossils
16. Wisconsin limestone
    Rich in small fossils
17. Italian brown marble
    Is it actually a marble? Extensively recrystallized, but details of some small fossils are preserved. Crystalline limestone or metamarble.
18. Texas yellow sandstone
    Abundant microscopic fossils
19. Stanford sandstone
    Angular quartz grains, some feldspar grains
20. Yellow Nario limestone
    Microscopic fossils
21. Black marble
    Brecciated limestone, recemented fragments
22. Pink and green granite
    Little quartz, so not a true granite. Pink and green-gray feldspar, dark pyroxene
23. Yellow marble
    Not marble, but granite that is mostly feldspar with some quartz
24. Dolomitc marble
    Compare with #8, which has a similar appearance, but different acid reaction
25. Basalt
    Probably an andesite, with more silica than true basalt.

Coarse-grained texture with large mineral grains.