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:
Heterosite Triphylite Mica group White Elephant Mine South Dakota USA. Three very purple pieces of heterosite sold as purpurite on eBay Purchased year or so back The seller sent these three pieces rather than the single large chunk offered in the auction then disappeared from the face of the earth Heterosit Triphylin Glimmergruppe