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NIST Chemistry WebBook
This National Institute of Standards and Technology website provides thermochemical, thermophysical, and ion energetics data. Information and data on gas-phase ion, organic, and organometallic thermochemistry, as well as thermophysical properties of selected fluid systems.
http://webbook.nist.gov/chemistry/

GEOROC Geochemical Database
GEOROC (GEOchemistry of Rocks of the Oceans and Continents) is a searchable collection of more than 50,000 analyses from different tectonic settings. Queries can be made based on bibliography, tectonic setting, geography, chemistry, and pet rography.
http://georoc.mpch-mainz.gwdg.de/

Chemfinder Chemical Directory
Directory of chemicals, physical properties, and Internet li nks.
http://www.chemfinder.com

Table of the Nuclides
Interactive map of the nuclides. Users can click to zoom in on a region of the table or enter a specific nuclide manually. Data listed for individual nuclides include atomic mass, binding energy, atomic abundance, parent/daughter nuclides (if applicable), and cross section values.
http://www2.bnl.gov/ton/

Thermodynamic Dataset for Rock-Forming Minerals
Summaries of experimental results for 253 mineral reactions involving 94 rock-forming minerals and the fluid components H2O, CO2, and O2. Values are given for entropy and enthalpy of formation. The dataset can also be downloaded as a complete file.
http://www.gfz-potsdam.de/pb4/pg1/dataset/