Complex sentence: Sanidine is common in rapidly cooled volcanic rocks such as obsidian and felsic pyroclastic rocks, and is notably found in trachytes of the Drachenfels, Germany.
Split into simpler sentences: Sanidine is common in rapidly cooled volcanic rocks, such as obsidian and felsic pyroclastic rocks. A notable locality with sanidine is in the trachytes of the Drachenfels, Germany.