Earth Rhyolite SLAB NOTEBlocks and slabs vary in appearance and dimension.All pictures are a rough guide. OTHERS Gemstone Red Tiger Iron Crisocolla Green Malachite “Original” Milky Opale Rhodonite Crysoprase Tiger Eye “Blue” Lapis Lazuli “A-Plus” Ruby Carnelian Multicolor Blood Agate Breche Agate Purple Jade