This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Amthyste et calcite Brsil. Amethyst und Calcitkristalle Ametista do Sul Alto Uruguai region Rio Grande do Sul Brazil crystals of quartz var amethysts crystals of calcite Ametista do Sul Alto Uruguai region Rio Grande do Sul Brazil cristaux de quartz var amthyste cristaux de calcite Ametista do Sul Alto Uruguai region Rio Grande do