Very hard water
William Gilbert, the dude who first figured out that the Earth had magnetic poles, thought that quartz was sort of like ice-9.
Lucid gems are made of water; just as Crystal [quartz], which has been concreted from clear water, not always by a very great cold, as some used to judge, and by very hard frost, but sometimes by a less severe one, the nature of the soil fashioning it, the humour or juices being shut up in definite cavities, in the way in which spars are produced in mines.
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