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LOT 2525
Fossil Hammatoceras Ammonite
JURASSIC PERIOD, CIRCA 183-176 MILLION YEARS B.P.
6 1/4 in. (750 grams, 16.1 cm).
Large Hammatoceras insigne specimen showing the characteristic discoidal form with strong ribbing. [No Reserve]
ProvenanceFrom Toarcian Caluados, France.
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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LOT 2525
Fossil Hammatoceras Ammonite
Estimate £30 - 40€35 - 46 (for guidance only)$41 - 54 (for guidance only)
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Very Large Cut Natural Unpolished Fossilised Tree Trunk Slice
Triassic Period, 251-199 million years B.P.Estimate: £40 - 60 (+bp*)
Bids: 1 | Current Bid: £5
Thick section of agatized wood showing some bark detailing on the outer edges. 1.81 kg, 30.8 cm
From Madagascar. Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK. -
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Collection of Cabochon Rubies
Estimate: £120 - 170 (+bp*)
Bids: 1 | Current Bid: £27
Comprising six polished cabochons, some lead glass-filled. 5.15 grams total, 8-11 mm
Private collection, London, UK. -
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Sericho Meteorite Cross-Section
Circa 4.5 billion years B.P.Estimate: £8,000 - 10,000 (+bp*)
Bids: 1 | Current Bid: £4,000
A spectacular polished slice displaying the characteristic crystalline structure of pallasites, with translucent amber-coloured olivine crystals suspended in a shimmering metallic iron-nickel matrix; accompanied by a custom-made display stand. 1.3 kg, 48.5 cm
Discovered in Isiolo County, Eastern Kenya, 2016. Private collection, USA.
Comprising 0.2% of all meteorites, pallasites are the rarest and most aesthetic examples and are highly sought after by collectors and museums. This cross-section reveals their mesmerising internal structure, consisting of translucent amber-coloured olivine crystals suspended in a shimmering iron-nickel matrix which has been polished to a mirror finish. Of all known pallasites, Sericho is especially renowned for its high concentration of olivine, often displaying hues of orange, yellow and green when spotlit or in direct sunlight. Cross-sections of this scale and integrity are particularly rare. While prized for their beauty, Sericho meteorites are also notoriously prone to oxidation if not treated correctly. This piece has been carefully prepared, resulting in a stable specimen that retains both its visual clarity and structural integrity.
