VanadiniteThis uncommon mineral rock stands out among other minerals of its type. It forms into hexagonal shapes in arid climates from the oxidation of lead ore deposits. It might look like chocolate, but eating is not recommended, the substance contains high amounts of lead and vanadium. Each sold separately, the mineral crystal you receive may not be depicted in the image. Length: 2. 5 in 5. 5 in Width: 2 in 4. 25 in Height: 1 in 2 in Weight: 2. 4 oz 2 lbs 2.