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This site examines the crystal chemistry of some common mineral groups, including garnet, plagioclase, pyroxene, mica (muscovite and biotite), and amphibole. For each group, the topics considered include: the sites in the crystal structure on which the principal substitutions take place, the typical ranges of observed composition variation, how to assess the quality of analyses from looking at the ... Full description.
Grade level: College (15-16)
Resource type: Illustration - scientific, Ref. material
Subject: Geochemistry, Mineralogy or petrology
 
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This site is a lecture by Dr. Stephen Nelson from Tulane University that explores the 32 possible combinations of symmetry operations that define the external symmetry of crystals. The lecture defines the six crystal systems (triclinic, monoclinic, orthorhombic, tetragonal, hexagonal, and isometric) and explains the derivation of the Hermann-Mauguin symbols (also called the international symbols) ... Full description.
Grade level: College (15-16)
Resource type: Illustration - scientific, Ref. material
Subject: Geochemistry, Mineralogy or petrology
 
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This site is a lecture from Tulane University that explores the symmetry observed in crystals. Topics covered include crystallographic axes, the crystal lattice, and unit cells. Tables and illustrations accompany the text. Full description.
Grade level: College (15-16), Graduate / Professional
Resource type: Illustration - scientific, Ref. material
Subject: Geochemistry, Mineralogy or petrology
 
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This site provides an illustrated lecture from a geochemistry course offered by Dr. Scott Wood at the University of Idaho. Topics include crystal chemistry, ionic substitutions in crystals, weathering (dissolution, redox reactions, acid hydrolysis, and kinetics), the solid products of weathering, and the chemistry of continental waters. The lecture presentation may be downloaded as a PDF document ... Full description.
Grade level: College (15-16)
Resource type: Problem set, Visualization - scientific, Ref. material
Subject: Geochemistry, Geology
 
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This resource provides illustrated lecture notes from a geochemistry course offered by Dr. Scott Wood at the University of Idaho. Topics include the law of radioactivity and the general geochronometry equation, the use common radioactive decay equations such as K-Ar, Ar-Ar, Rb-Sr, and U-Th-Pb, the use of isochrones, concordia diagrams and discordia, the concept of "blocking temperature," the use of ... Full description.
Grade level: College (15-16)
Resource type: Problem set, Visualization - scientific, Ref. material
Subject: Geochemistry, Geologic time
 
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This site provides an illustrated lecture about ocean chemistry from a geochemistry course offered by Dr. Scott Wood at the University of Idaho. Topics include geochemical processes that occur in estuaries, halmyrolysis, the concept of residence time for elements in the ocean, the mechanisms by which elements are added to or removed from seawater, carbonate behavior in seawater and a definition of ... Full description.
Grade level: College (13-14), College (15-16)
Resource type: Illustration - scientific, Photograph, Visualization - scientific, Ref. material
Subject: Geochemistry, Chemical oceanography
 
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This site is a lecture by Dr. Stephen Nelson from Tulane University that discusses the various nonstandard forms of crystal growth that are characteristic to some minerals. Topics include twinning (contact and penetration, polysynthetic and cyclical), the origins of twinning, and twin laws in the triclinic, monoclinic, orthorhombic, tetragonal, hexagonal, and isometric systems. Various types of polymorphism ... Full description.
Grade level: College (13-14), College (15-16)
Resource type: Illustration - scientific, Ref. material
Subject: Geochemistry, Mineralogy or petrology
 
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This site provides access to a number of visual resources and supporting material illustrating the concept of radioactive decay and its central role in radiometric dating. Visualizations include diagrams, graphs, static illustrations and photos. Resources found on this site are suitable for use in lectures and classes and may also be used as the basis for labs or other activities. Full description.
Grade level: High (9-12), College (13-14), College (15-16), Graduate / Professional
Resource type: Illustration - scientific, Photograph, Visualization - scientific, Abstract / Summary, Clearinghouse
Subject: Geochemistry, Geologic time
 
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This site, maintained by Caltech, is a tutorial on the basic principles of phase equilibria. Topics covered include the first and second laws of thermodynamics, equilibrium, Gibbs free energy, chemical potential, the graphical representation of equilibrium conditions, the phase rule, and univariant and invariant assemblages. Also included are several applets that show the results of changes in pressure, ... Full description.
Grade level: College (15-16), Graduate / Professional
Resource type: Visualization - scientific, Glossary, Ref. material
Subject: Geochemistry, Mineralogy or petrology
 
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This web site is maintained by John Winter of Whitman College, and contains 31 PowerPoint presentations for an igneous and metamorphic petrology course. The course and the lectures are keyed to his text, An Introduction to Igneous and Metamorphic Petrology. The PowerPoint presentations are organized by chapter and contain many maps, graphs and illustrations. Each chapter is a separate PowerPoint file ... Full description.
Grade level: College (13-14), College (15-16), Graduate / Professional
Resource type: Course, Presentation / Demo, Illustration - scientific, Map, Software
Subject: Geochemistry, Geology, Mineralogy or petrology
 
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Results 21 - 30 of 107 <<  1 2 3 4 5 6 7  >>