Find a
Resource
Select grade level(s) Select resource type(s) Select collection(s) Select standard(s) Skip navigation Digital Library for Earth System Education
Digital Library for Earth System Education
Home
New to DLESE?
Search tips
Educational resources > Find a resource > Resource description
External Symmetry of Crystals, 32 Crystal Classes
http://www.tulane.edu/~sanelson/eens211/32crystalclass.htm
From Cutting Edge
Comment on this resource
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) used to describe the crystal classes from the symmetry content. Tables and illustrations accompany the text.
Intended for grade levels:
  • College (15-16)
Type of resource:
  • Visual:
    • Illustration - scientific
  • Text:
    • Ref. material
Subject:
  • Geological Sciences:
    • Geochemistry
    • Mineralogy or petrology
Technical requirements:
No specific technical requirements, just a browser required
Cost / Copyright:
No cost
Copyright 2001 Tulane University New Orleans, LA 70118
DLESE Catalog ID: SERC-NAGT-000-000-000-727
Resource contact / Creator / Publisher:
Author: Stephen A. Nelson
Tulane University