Geology 300: Physical Geology
Geology 301: Physical Geology Lab
Geology 305: Earth Science
Geology 306: Earth Science lab
Instructor: Arthur Reed, P.G.
Igneous Rock Samples for Geol 306 Activity 2.4
All samples are approximately 1” – 3” in size
NOTE: ALWAYS CLICK ON THE SAMPLE NUMBER UNDER THE PHOTO TO GET THE BEST/CORRECT VIEW OF THE MINERAL
SAMPLE 530b (same name as 530c)
SAMPLE 530c (same name as 530b)
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.