MacArgon 9.2.7 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. MacArgon for Mac belongs to Education Tools.
From the developer:
Allows simulation of argon retention in minerals and rocks. Arbitrary pressure-temperature-time paths can be input that a rock must follow, and calculations are performed as to the diffusion of argon from the mineral grains in question.
You may want to check out more Mac applications, such as Course For Flash CS5 101, dvcreatorsUniversity or Formation complète au Mac, which might be related to MacArgon.