Zeolites

**Definition:** Zeolites. A group of crystalline, hydrated alkali-aluminum silicates. They occur naturally in sedimentary and volcanic rocks, altered basalts, ores, and clay deposits. Some 40 known zeolite minerals and a great number of synthetic zeolites are available commercially. (From Merck Index, 11th ed)

**Tree numbers:** - D01.056.050.075.975 - D01.578.725.025.975 - D01.650.550.050.075.975 - D01.837.725.700.760.050.950

**Synonyms:** - Zeolite