https://exhibits.lafayette.edu/geology/files/original/65ac3758d008f6ee7ce67134c11ece7a.JPG
Media
Part of P197/P198: Hornblende-Andesite. Stenzelberg, Seven Mts., Rhenish-Prussia
Part of P197/P198: Hornblende-Andesite. Stenzelberg, Seven Mts., Rhenish-Prussia