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Two large calcite crystals mounted in frame

1851-1950

Calcite bezoar, beige, spherical

Brass demonstration polariscope with biaxial crystal

1830-1880

Calcite spine of fossil sea urchin, labelled

Calcite spine, pear-shaped, fossil

De Senarmont Calcite Prism by Edouard Lutz, Paris, 1876

1870-1876

Iceland spar

1801-1837

Polariscope by Harvey & Peak, successors to W. Ladd & Co., Beak St., London, In incomplete wooden case (case front missing), instrument signed.

Polariscope by Harvey & Peak

1884-1889

Calcite bezoars, 4, gold coloured, irregular in shape, from a bull, labelled, found in 1704

Calcite bezoars

Rhombohedral calcite crystal, 'Iceland Spar' prism with brass eye piece magnifier (removed from instrument), unsigned, European, 1880-1920. Used to demonstrate the double images produced by the mineral calcite.

Rhobomhedral crystal of 'Iceland Spar' with magnifier

1880-1920