Geology 300: Physical Geology
Geology 301: Physical Geology Lab
Geology 305: Earth Science
Geology 306: Earth Science lab
Instructor: Arthur Reed, P.G.
These 3D images are not part of this activity, they are just for fun
Igneous Rock Samples for Geol 301 Lab Activity 5.7
All samples are approximately 1” – 3” in size
This is similar to the intrusive igneous rock of our Sierra Nevada batholith. (note the lack of the peach-colored mineral potassium feldspar)
SAMPLE 530b (also 530c)
SAMPLE 535b (also 535)
Very low specific gravity (less than 1)
Generally dark igneous rocks are higher in iron and magnesium, lower in silica, and higher in density.
This sample is an exception to that rule. Note the conchoidal fracture.