Petrology is the study of rocks: their composition, mineralogy, and origin. The detailed characteristics of chemistry, minerals, and mineral textures can lead to a detailed understanding of rock genesis. This information can then be used to address larger scale geologic issues, such as the tectonic development of mountain ranges and the eruptive history of volanoes.


Special documents Syllabus
Using petrographic microscopes: adjustments and features
Internet resources
Exam study guides Igneous rocks
Metamorphic rocks
Igneous rock labs White Mountain magma series White Mountain magma series data set
White Mountain Magma Series discussions 1, 2, 3, 4
Photo gallery
New Hampshire magma series New Hampshire magma series and Wooley Creek data sets
New Hampshire magma series and related discussions 1, 2, and 3
Photo gallery
Skaergaard and Stillwater intrusions Skaergaard topics:1, 2, 3, 4
Stillwater topics: 1, 2, 3
Skaergaard-Stillwater photo gallery: 1; virtual field trips: 2, 3
Iceland lavas Iceland lavas data set
Iceland geology and related descriptions: 1, 2, 3
Photo gallery
Metamorphic rock labs New England schists New England geologic maps 1 and 2 and metamorphic maps 1 and 2
New England metamorphism discussions: 1
Photo gallery
New England mafic rocks New England geologic maps 1 and 2 and metamorphic map 1
Metamorphism discussions focusing on mafic rocks: 1, 2, 3
Photo gallery
Norwegian eclogites Geologic map of Fennoscandia, and very simplified map
Geologic discussions including the Norwegian Caledonides: 1 (short and sweet), 2 (pretty), 3 (field trip)
Photo gallery
Fault rocks Fault rock discussions: 1, 2
Photo gallery.
Forms and graph paper Rock report form
Ternary graph paper, or maybe this green one is better with a color printer
Spreadsheet utilities and some documents Papers to replace field trips

How to calculate norms from rock chemical analyses,

NORM4 norm spreadsheet for single samples,

NORM4 macro-enabled version for multiple samples.

Calculating ferric iron corrections for amphiboles
Making thin sections
Staining feldspars in thin section
Fill in missing values on REE diagrams!
Make ternary (triangle) diagrams in Excel!
Whole rock geochemical discriminant diagrams!
Image libraries Igneous mineral examples: Common minerals in igneous rocks.
Metamorphic mineral examples: Common minerals in metamorphic rocks, excluding igneous minerals, above.
Moon rocks: Moon rocks and rock thin sections from a NASA loaner set.
Hand sketches in petrology, an almost forgotten art.
Petrology field trips 2000 trips
2001 trips
2002 trips
2003 trips
2004 trips
2006 trips
2009 trips
2011 trips
2013 trips
Other field trips