Larimar aka Blue Pectolite, is similar to petrified wood. It is only found in the Dominican Republic, and shares its distinctive color with the Caribean ocean. This piece is breathtaking. It has a rich blue color with great "spider web," patterning. It is thick at .8 cm, but it such high quality as to be 90% translucent with backlighting (see fourth pic for backlit example). It has an excellent polish, and a heavy "feel" when holding it. This example is not for jewelry, it is an amazing piece of Larimar for someone who wants a fine example. It weighs 36 grams.