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In fact, lead fluorosilicate is one of the most water-soluble forms of lead.
Fluoridation chemicals - sodium fluoride, sodium fluorosilicate, and fluorosilicic acid (FSA) – are all derived from the manufacture of phosphate fertilizer, reports the CDC.
The stone has a hardness of 8 and is a fluorosilicate of aluminum and natural crystals.
As for possible work, he observes that crucial "fluorosilicate minerals are sometimes encountered in significant concentrations in the highlands.