This is a super nice sponge gold nugget from the 16 to 1 Mine in California. It is 5/8" long x over 1/2" wide and it has a really unique shape. The weight of this gorgeous gold specimen is 35.5 Grains (2.29 Grams). Sponge Gold Nuggets are so called because the surface is coarse and rough like a sponge. It is very rare and hard to find for sale as collectors love the fine texture of sponge gold. The 16 to 1 Mine is situated in Alleghany in Sierra County, California. It is not often that I have any sponge gold for sale as it is very rare and hard to find.