Tumble Polished > Gemmy Grade Prehnites Tumbled Polished Cabs Rough Nice lite soft smooth green PREHNITE crystal tumbled polished mineral specimen gem stone tumbling wire wrapping freeforms Raw uncut lapidary cabs jewelry grade pebble sized chunk Prehnites Tumbled Polished Cabs Rough http://facetroughgemstones.com/gem-store/product_info.php/products_id/2068