Zeolites form where volcanic rocks and ash layers react with alkaline groundwater. Zeolites also crystallize in post-depositional environments over periods ranging from thousands to millions of years in shallow marine basins. No two are exactly alike in shape or size or color.
Assorted by overall color, this post is Zeolites with tones of blue, green or purple. Please add a note during checkout if there is a preferred type of Zeolite. We will try out best to accommodate requests within our on-hand assortment.
Small, 1" - 2"
Medium, 2" - 3"
Large, 4" - 6"