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CODATA Thermodynamic Values for Key Substances
Table of internationally agreed upon values coordinated by The Committee on Data for Science and Technology. Includes the standard enthalpy of formation at 298.15 K, the entropy at 298.15 K, and the quantity H°(298.15 K)-H°(0) for elements, ions, and compounds.
Joint Expert Speciation System
Thermochemical database for modelling aqueous solution chemistry, including more than 230,000 critically-assessed equilibrium constants and enthalpies for about 70,000 reactions.
MELTS Supplemental Calculator
Calculator for thermodynamic data in geological systems as a function of temperature, pressure, and composition. User can select a mineral solid solution and provide either mole fractions or oxide weight percentages, and specify desired temperature and pressure.
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.
Thermodynamic Database
Molar heat capacity, entropy, and standard enthalpy of formation values for selected elements and compounds. Data are given at 100 degree intervals from 200 to 3000 K, and also summarized for all species at 298 K.
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.
WebElements Periodic Table of the Elements
Interactive periodic table. Clicking on an element brings up a list of general properties and data, and information on its discovery, history, uses, geologic occurrence and abundance, compounds, and chemical isolation.