A phase diagram shows the preferred physical states of matter at different temperatures and pressures. This phase diagram shows these states for water. Critical points, triple points, and ice phase processes are defined and illustrated as a function of pressure and temperature. The diagram is accompanied by a set of tables that give detailed thermodynamic data for the triple points and structural/crystallographic ... Full description.

This educational resource describes the science behind volcanoes and volcanic processes. Topics include volcanic environments, volcano landforms, eruption dynamics, eruption products, eruption types, historical eruptions, and planetary volcanism. There are two animations, over 250 images, eight interactive tests, and a volcano crossword puzzle. Full description.

Windows to the Universe brings together scientific content on Earth and space sciences with interdisciplinary content on the arts and humanities. Three levels of content are provided: students (K-12 through undergraduate), teachers, and browsing adults. The site includes documents, images, movies, animations, sounds, games, and data. Full description.

The activities in this 16-page magazine encourage children to look more closely at geology in their local environments and support their exploration of a range of dynamic Earth processes. Full description.

DataSlate is a multi-curricular, image visualization tool for students. It allows students to easily and quickly maneuver through huge image data sets, overlay and compare images gathered over time, or with different instruments, and observe historical, geographical, geological, and environmental change or to compare images of the same area at different wavelengths. DataSlate includes a CD-ROM (with ... Full description.

This basic guide provides information about starting and maintaining a rock collection. Topics include starting a collection, identifying specimens, where and how to collect, and how to house and document a collection. Full description.

This tutorial provides a basic discussion about crystallography. Text and diagrams explain how crystals are measured, classified, and described, and point out that minerals can be identified by their crystal shapes and growth habits. Full description.

This resource is an outline of a course on optical mineralogy. Topics include Properties of Light, Refractometry, Isotropic Materials, Anisotropic Minerals, Optical Properties, Uniaxial Minerals, and Biaxial Minerals. This website features tables with the optical properties of many minerals, along with thin section photographs and lecture notes. The website would be useful for students of mineralogy ... Full description.

This resource is part of a mineralogy course. Topics include the petrographic microscope, light behavior,the refractive index, use of an interference color chart, interference figures and how to obtain them, and two lab exercises. The website briefly explains some key concepts crucial to developing mineral identification skills. The site would be useful as an introduction or review of the basic principals ... Full description.

This resource is a 43 page pdf document on the principals of optical mineralogy. Topics include light, the polarizing light microscope, the refractive index, optical classes and indicatrix theory, the relationship of optical properties to crystal chemistry, and advanced methods in optical mineralogy. The website features both text and figures. Full description.