Beryl: Beryl is a warm gemstone which develops, between the third hour and midday, from the foam of water when the sun burns it severely. Its power is thus more from air and water than from fire, but nevertheless it has some of the properties of fire. And if a man has drunk or eaten poison, then he should place a little beryl in spring water and drink it at once. Continue for five days drinking it once a day while fasting, and the poison will foam up through vomiting, or it will pass out of him through the rear.
Hildegard of Bingen, Selected Writings
mysticism