Kambaba Jasper, Tumbled Stone, 1 lb lot Black Tourmaline They may be more accurately

They may be more accurately described as "Orthoceratidae" to include other genus

It's an indispensable reference for crystal lovers everywhere

and red banding around a white agate center

and the last three images show examples of cut and polished Cold Mountain Thunderegg specimens

enjoy an easy and fun tumbling experience for any rockhound

Kambaba Jasper, Tumbled Stone, 1 lb lot Black Tourmaline They may be more accuratelyKambaba Jasper, widely believed to be a stromatolite (similar to fossilized algae), is actually a rhyolite found in volcanic rock. It has a solid medium to forest green background, with black circular formations caused by amphibole needles. This material comes from Madagascar, and takes a nice polish. 1 lb lot contains 20 30 pieces of approximately 1" fully tumbled stone