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Two similar Derbyshire Blue John fluorspar ovoid door stops Early 20th century (2) image 1
Two similar Derbyshire Blue John fluorspar ovoid door stops Early 20th century (2) image 2
Two similar Derbyshire Blue John fluorspar ovoid door stops Early 20th century (2) image 3
Lot 70

Two similar Derbyshire Blue John fluorspar ovoid door stops
Early 20th century

The Contents of Kerfield House
11 September 2025, 10:00 BST
London, New Bond Street

Sold for £4,864 inc. premium

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Two similar Derbyshire Blue John fluorspar ovoid door stops

Early 20th century
Of domed bell form, one with plain brass knop and the other with foliate banded knop finial, 15cm and 17cm high (2)

Footnotes

Blue John is a variety of the common mineral fluorspar, which is composed of calcium fluoride (CaF2). Fluorspar can be in any colour, but it is known as Blue John when it is bluish purple with a white banding, thought to be caused by inclusions or impurities. The name Blue John was not recorded until 1766, when Lady Mazarine, one of the Eyre family and a major landowner in Derbyshire, was recorded leasing 'ye mine of Blue John'. Robert Adam was incorporating Blue John into his chimney-piece designs in 1760 and Matthew Boulton referred to 'Blew John' in a letter dated 1768. Prior to the 1760s it was sometimes referred to as 'Derbyshire Drop', 'Derbyshire Spar' or even 'Radix Amethysti'.

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Bid now on these items

A Jacobite concealed portrait snuff box18th century
A 15th century carved limestone figure of St George
A Derby centrepieceCirca 1765
A pair of mid 16th century Italian patinated and parcel gilt bronze angel candlesticks Probably Tuscan and in the manner of Domenico Becafumi (1484-1551)
A Renaissance Florentine panel woven in silks and metal threadMid 15th century, probably for a Dalmatic garment
A 16th century tapestry fragment Formerly part of a larger tapestry in Gerona Cathedral
A set of three Holkham Pottery wine jugs Third quarter 20th century
An extremely rare early 17th century Dutch black, red and gilt japanned casketProbably attributable to Willem Kick (Dutch, 1579-1647)
A carved limestone bust of a kingProbably late 14th/early 15th century, and later
A rare and impressive Charles II leaded bronze 'York' mortar Made for Roger Warde, apothecary, and dated 1684, together with a large associated cast iron pestle
A collection of four commemorative glass bowls and plates including for the Coronation of King George VI Second quarter 20th century and earlier
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Of Grand Tour interest: A collection of six trays of 19th century plaster intagliosProbably from the workshop of Pietro Paoletti (Rome, 1801-1847)
Francesco Righetti I (Italian, 1738-1819): A patinated bronze figure of the Apollo BelvedereAfter the antique, Roman, the cast dated 1787
After Pierre Lepautre (French, 1659-1744) and François Girardon (French, 1628-1714): A patinated bronze figural group of 'Aeneas carrying Anchises'French, probably first half early 19th century
A rare French gilt copper and champlevé enamel crozier finial depicting St Michael slaying the devil as a dragon Limoges, 1220-1230
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An early 19th century satin-birch, 'mulberry wood', ebonised and mother of pearl vanity and sewing box
A French second half 19th century red stained tortoiseshell, cut brass inlaid and gilt metal mounted 'Boulle' casket Circa 1870
Sir Alfred Gilbert, M.V.O., R.A (British 1854-1934): a patinated bronze figure of 'An Offering to Hymen'
A silvered bronze cockatoo Early 20th century, probably Austrian