Ingredients of the Markasite, which are, Bitumen, Iron, Copper, and
Earth, and with them compounds Allum, Vitriol, and Sulphur. With the
Earth alone it compounds Allum; with the Metal alone, or Metal and
Earth together, it compounds Vitriol; and with the Bitumen and Earth it
compounds Sulphur. Whence it comes to pass that Markasites abound with
those three Minerals. And is it not from the mutual Attraction of the