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LOT 2735
Fossil Platyostoma Gastropod on Matrix
SILURIAN PERIOD, CIRCA 430 MILLION YEARS B.P.
3 5/8 in. (242 grams, 92 mm).
Platyostoma niagarensis set on an irregular matrix. [No Reserve]
ProvenanceAcquired Hunstanton, UK.
From the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent.
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AUCTIONS:
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Large Fossil Ammonite Cluster
Jurassic Period, 201-174 million years B.P.Sold for (Inc. bp): £59
Comprising several different size ammonites, Gagaticeras or Promicroceras, on a nodule. 1.79 kg, 18 cm
From Yorkshire coast. From a Lincolnshire, UK, collection. -
Gypsum Pink Alabaster Specimen
Estimate: £20 - 30 (+bp*)
Opening Bid: £3
Displaying natural veining and areas of darker colour. 843 grams, 11.4 cm
From Aust Cliff, River Severn, Gloucestershire, UK. Acquired from Milton Keynes Geological Society 1998. From the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent. -
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Large Rainbow-coloured Carborundum Crystal Display Specimen
Sold for (Inc. bp): £33
A large cluster of silicon carbide showing beautiful iridescence. 1 kg, 16 cm
From the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent.
Carborundum rarely occurs in nature, but is commercially formed by heating carbon and silicon at very high temperatures, producing extremely strong bands of crystals.
