Where can I purchase a 12 inch by 12 inch or larger slab of semi-transparent and unworked piece of Optical Calcite nearest to Daytona Beach Florida?
Optical calcite is widely available and most "rock shops" catering to the general public should sell it. Though a 12 x 12 inch size is rare to come across. My best suggestion would be to buy it on ebay. Take a look at this link: