Calx fluor Christmas tree modern scientific names: Tyrannus tyrannus

modern scientific names: Tyrannus tyrannus

Charles James Fox and Cecil Wray

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

Set within a large marquee on the17th January

They are assembled in Guildhall on their return from South Africa

Calx fluor Christmas tree modern scientific names: Tyrannus tyrannusTwo 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