This site hosts a computer application for thermobarometry. The program calculates pressures and temperatures for garnet, cordierite, spinel, sillimanite/kyanite, quartz anhydrous or hydrous pelitic assemblages. The user enters cation values for each mineral, and the model generates pressure vs. temperature graphs or data tables of the calculated isopleths. The program is derived from the shareware ... Full description.

MELTS is a software package for modeling crystallization of magmatic systems. The MELTS home page provides acess to three types of modeling tools. The software can be used to calculate phase equilibria or to compute thermodynamic properties of mineral solid solutions. For most applications the user enters mineral composition, temperature and pressure. The web site features demo software, downloadable ... Full description.

This NASA website documents the detection, tracking and measurement of volcanic eruption plumes from space. The site features an image archive of satellite data that has been used to create maps and measure sulfur dioxide, volcanic ash, and aerosol emissions by volcanoes since 1978. The site also provides an extensive list of links to other volcanology-related resources. Full description.

This site provides links that cover current and internet-based information concerning crystallography. Resources presented include organizations, activities, educational websites, and journals. Full description.

This site is a table of crystallography groups. The table is composed of 32 classes of symmetry derived from observations of the external crystal form. From these 32 classes, 230 space groups are distinguishable using x-ray analysis. The site also features 3-D rotating examples of crystalline forms for each symmetry class. The illustrations are helpful for visualizing crystal forms. Full description.

This clearinghouse consists of crystallography links with an emphasis on education and tutorials. There is also a search feature, which allows the user to explore a large crystallographic database. Additionally, the site is available in French. Full description.

This clearinghouse consists of crystallographic web sites. Topics include x-ray diffraction systems, sources & detectors, x-ray data, university crystallography laboratories, synchrotron, crystallographic tutorials, crystallographic software documentation (on-line), crystallographic software, crystallographic servers, crystallographic instrument accessories, crystallographic databases, crystallographic ... Full description.

This site consists of the lecture notes for an advanced mineralogy course at the University of Colorado taught by J. R. Smyth. The topics covered include symmetry, point groups, space groups, diffraction and structures, mineral spectroscopy, and descriptions of orthosilicates, sorosilicates, cyclosilicates, chain silicates, and layer silicates. Figures, photographs and tables are included with the ... Full description.

This site is an interface to a crystal structure database that includes every structure published in the American Mineralogist, the Canadian Mineralogist, and the European Journal of Mineralogy. The database is maintained under the care of the Mineralogical Society of America and the Mineralogical Association of Canada, and financed by the National Science Foundation. The site is searchable by mineral, ... Full description.

This searchable database, maintained by the Russian Foundation of Basic Research, includes 4785 entries (2365 unique mineral names). Each mineral can be searched by name, specification, crystal chemical formula, or crystal structure characteristics. The crystal structure information includes mineral name, specification, crystal chemical formula, space group, unit cell parameters, coordinates, thermal ... Full description.