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