Wilfred Santacruce: The structures in "chemical gardens" are formed from insoluble metal silicate compounds (usually hydrous metal silicates) that precipitate when a solution of a soluble metal salt (like copper sulfate, cobalt chloride, calcium chloride, etc.) encounters a solution containing silicate ions. In the chemical garden case, the metals come from the dissolution of the solid, but soluble, soluble metal salt.See sources for additional details...Show more
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