Geology 300: Physical Geology

Geology 301: Physical Geology Lab

Geology 305: Earth Science

Geology 306: Earth Science lab

Samples: Minerals, Sedimentary, Igneous, Metamorphic

Instructor: Arthur Reed, P.G.

Igneous Rock Samples for Geol 301 Lab Activity 5.7

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 530

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 530c

SAMPLE 531

SAMPLE 535

SAMPLE 535b (also 535)

SAMPLE 536

SAMPLE 537

SAMPLE 546

SAMPLE 547

Very low specific gravity (less than 1)

SAMPLE 549

SAMPLE 550

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.

SAMPLE 563

SAMPLE 585

SAMPLE 586

SAMPLE 620