Excel spreadsheet that allows for fast plotting onto a TAS (total alkali silica) diagram for use in naming your volcanic rock by composition. Created using coordinates as given in Le Maitre et al (2002). Version 3.0 New version by C��dric Gouard. Significant improvements and new features! Logic based on rock composition will now classify your rock type even further than the fields on the TAS diagram. For example, a trachybasalt may be further identified as a hawaiite or potassic trachybasalt; a basaltic trachyandesite may be further identified as a mugearite or shoshonite. The TAS diagram is now drawn in a more sensible way from formulae, and overall user friendliness is improved.

{"references": ["Le Maitre et al (2002)"]}