Blodite is a RARE hydrated sulfate found in oceanic and lacustrine salt deposits and in nitrate deposits in arid regions. This is an OUTSTANDING and LARGE example of the rare species. This pristine, doubly terminated, dark gray, FLOATER crystal is lustrous, transparent to translucent and has very sharp faces and edges. The chisel-like or boat prow terminations are fascinating. The crystal is lightly coated by shellac to prevent dehydration, I would presume. Excellent material from the famous Soda Lake of California and the Carl Davis Collection.