+A  Click here to enlarge/reduce to/back from full screen 
Paul Scherrer Institut PSI GEM Software (GEMS) Home

Paul Scherrer Institut
5232 Villigen PSI, Schweiz/Switzerland
Tel. +41 56 310 21 11
Fax. +41 56 310 21 99

E-Mail: gems2.support@psi.ch

Printer Friendly Printout without Logo or Navigation Elements available here... just click and print

GEMS Logo GEMS: Terms and Conditions of Use

The GEM Software (GEMS) and related material (data and documentation), contained in or furnished in connection with the GEM-Selektor v.3 (GEMS3) program package for geochemical modelling, are made available by the Paul Scherrer Institute (PSI) to be used in the public interest and for the advancement of science.

Permission to use the GEM Software is thereby granted free of charge for educational and academic research purposes only, provided and as long as these Terms and Conditions of Use are accepted.

The user agrees to acknowledge the authors (GEMS Development Team) and the PSI in any publications and reports that result from the use of GEMS, or in software products that include GEMS in whole or in part, by explicitly citing this web page address (https://gems.web.psi.ch) and the following papers:

  • Kulik D.A., Wagner T., Dmytrieva S.V., Kosakowski G., Hingerl F.F., Chudnenko K.V., Berner U. (2013): GEM-Selektor geochemical modeling package: revised algorithm and GEMS3K numerical kernel for coupled simulation codes. Computational Geosciences 17, 1-24. doi.

  • Wagner T., Kulik D.A., Hingerl F.F., Dmytrieva S.V. (2012): GEM-Selektor geochemical modeling package: TSolMod library and data interface for multicomponent phase models. Canadian Mineralogist 50, 701-723. doi.

Although the current version of GEM-Selektor package comes with executable files only, the GEMS3K code - numerical kernel of GEMS3 - is released open-source under the terms of LGPL (Lesser General Public License) v.3. In particular, any modification of the GEMS3K source code must include a notice clearly stating its purpose, author(s), and date; the GEMS Development Team will review the modification and decide about putting it into the next version of the source code tree.

Because the GEM Software and related material is free (other than nominal materials and handling expenses) and provided "as is" in its current state, the GEMS Development Team and the PSI have made no warranty, expressed or implied, as to the accuracy or completeness, and cannot take any obligation to provide the user with any updates, revisions, new versions, support, consulting, training, or assistance of any other kind with regard to the use, operation, and performance of GEMS3.

The user assumes all risks for any damages whatsoever resulting from loss of use, data, or profits arising in connection with the accessibility, use, quality, or performance of this software (see Disclaimer below).


GEM Software is developed as a tool for scientific research and distributed "as is", in its current state of development.

Hence, the PSI and the GEMS Development Team make no warranty or representation of GEMS as error free, accurate, complete, or useful for any specific application. PSI and GEMS Development Team shall not be liable for any claims, demands, liabilities, costs, losses, damages or expenses of any kind caused to or suffered by any person or entity that directly or indirectly arise out or result from the use of the software or in any connection thereof.

Please note that some information accessed through this page may be preliminary in nature and presented prior to final review, quality assurance, and approval by the PSI authorities. This information is provided with the understanding that it is not guaranteed to be correct or complete. Any conclusions drawn from such information are in the sole responsibility of the user.

Any use of trade marks, product, or company names in GEMS web pages and help pages is solely for descriptive purposes.


GEMS Development Team

Europe, Asia:
Paul Scherrer Institut  

Dr. Dmitrii Kulik
or Dr. George Dan Miron

Forschungsstrasse 111
5232 Villigen PSI


The Americas:
Dr. Alexander Gysi
Economic Geologist
New Mexico Bureau of Geology & Mineral Resources
Assistant Professor,
Department of Earth & Environmental Sciences

801 Leroy Place
Socorro, NM 87801


Last updated: 02.06.2021

Copyright (c) 2003-2021  GEMS Development Team.