The KamenCheck application is a learning aid that can be used to determine typical Slovenian rocks on the basis of the determination key. It covers three main substantive topics: Stone Key, Encyclopedia and Little School. In the Stone Key, the name of the selected stone is determined by observing and answering a question with YES / NO. The help is in the orange-colored link to the interpretation of geological terms and procedures in the Mali School. The answers lead us to detailed descriptions o