Fundamental Rockhound Products: Rough GREEN OPAL Bulk Rock for Tumbling Metaphysical Gemstones Healing Crystals Wholesale Lot from Madagascar (2 lb) Green Common OPAL rough - Sizes range from 1 to 1 1/4" Average. Very unusual color, Mohs hardness approximately 5. Perfect for Tumbling Rock, Gridwork, Meditation, Metaphysical Use, Crafts, Indoor Fountains, Home or Office Decor Stones are shown wet on photo #1. Photo number 2 shows the stone dry and in the sun. Your stones will be more like photo #2 unless you either wet them or polish them. Your stones will not be the exact stones in the photo but will be very similar in size and shape WARNING: Not for Children under 6 years of age, as smaller pieces could become a choking hazard. Seller is not responsible for misuse of this product.