ITEM DETAILS - sizes may vary because its natural gemstones made by nature sizes are around 0.25-0.50 inches (5-8 mm) Believed to have formed in the cretaceous period roughly 65 to 90 million years ago, crazy lace agate is a banded chalcedony or microcrystalline quartz mineral infused with iron and aluminum. It's a unique stone in that it's often brightly colored and filled with ornate, intricate patterns. ~ Healing ~ Hope Unity Cleansing Purification Promptness Calming Harmony Protection Optimism Positive thinking Joy Truth Appreciation for nature Smooth energy flow Blue Lace Agate helps to strengthen and accelerate the repair of bones, thyroid deficiencies, throat and lymph infections.