Ferrum arseniatum Size:S: 50 x 25cm Richard Gere as Danny Zuko

Richard Gere as Danny Zuko (left) seen here on stage at the Coventry Theatre during a dress rehearsal for Grease

Interior view of the Doctors' Commons

Crystal Palace

View of the London Institution on the north side of Finsbury Circus

Ferrum arseniatum Size:S: 50 x 25cm Richard Gere as Danny ZukoTwo specimens of iron arsenate crystals, here termed 'arseniate of iron' with figures showing their cubic crystalline form. Plate 87 from British mineralogy: or coloured figures intended to elucidate the mineralogy of Great Britain, by James Sowerby, volume 1 (London, R. Taylor & Co., 1804). The accompanying text states that 'This was mostly confounded with arseniate of copper until the celebrated Chenevix, by analysis, ascertained it see Phil. Trans.