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Mookaite is found only in

Australia and is actually a fossiliferous sedimentary rock. Microscopic examination shows this rock consists of the remains of tiny organisms known as radiolaria that have an unusual skeletal structure of opaline silica. When the seas retreated, these sediments were cemented into solid rock by silica carried in groundwater. Mookaite has been found in many very bright colors, reds, purples, tan, snow white, ivory white, pinks and many other shades. Sometimes but not often it will have black dendrites and in the hands of a careful lapidary the cabochons can be stunning especially if you get very lucky and run into a nice dendrite tree.