CHAPTER 14NATURAL SALT CRYSTALSPicture #10910-inch-tall Rock Salt StalactiteSome natural minerals can be damaged by water alone.Halite (natural rock salt) and selenite (related to Epsom salts) are particularly vulnerable to water damage within minutes or hours.I recently had an entire box of sand selenite crystals start to melt from being stored in a humid barn.The surfaces […]
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