Calx fluor Christmas tree with figure and scale inscriptions

with figure and scale inscriptions positioned accordingly

They are assembled in Guildhall on their return from South Africa

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Plate 100 from British mineralogy: or coloured figures intended to elucidate the mineralogy of Great Britain

Calx fluor Christmas tree with figure and scale inscriptionsTwo specimens of fluorite, here termed 'fluate of lime, or fluor', with a figure showing its crystalline form. Plate 73 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 'These specimens are among the rarest of the fluors known in Great Britain. The upper one is in the possession of my very generous friend