KREEP rocks with high contents of K, REE and P were first recognized in Apollo 12 samples, and confirmed later that there were KREEP rock fragments in all of Apollo samples particularly in Apollo-12 and 14 samples.

• 克里普岩(KREEP)最早发现于Apollo-12样品；后来在所有返月样品中都发现3克里普岩碎片；尤其以Apollo-12和Apollo-14着陆点样品中最多；因其富含元素K；REE和P而被称之为KREEP.