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LOT 2324
Large Cut and Polished Banded Agate Crystal Geode Slice
9 3/4 in. (575 grams, 24.6 cm).
Thick slice of 'fortress' agate with grey, brown, black and orange banding, the internal cavity lined with small pale purple amethyst crystals. [No Reserve]
ProvenanceFrom Brazil.
Ex Mineral Imports, London, UK.
Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.
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AUCTIONS:
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LOT 2324
Large Cut and Polished Banded Agate Crystal Geode Slice
Estimate £30 - 40€35 - 46 (for guidance only)$41 - 54 (for guidance only)
Opening Bid
£5 (EUR 6; USD 7) +BP*
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Fossil Tylosaurus Marine Dinosaur Vertebra
Late Cretaceous Period, circa 92-66 million years B.P.Estimate: £30 - 40 (+bp*)
Opening Bid: £5
The main body of a vertebra with two raised ridges underneath, likely a pygal or caudal vertebra; old inked collector's number 'VR26'. 622 grams, 96 mm
From near Harlan County Dam, Nebraska, USA. 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.
Tylosaurus was an apex marine predator during the Late Cretaceous period, and is classified in the superfamily Mosasauroidea. -
Large Woolly Mammoth Tooth
Devensian Period, 110,000-12,000 years B.P.Estimate: £300 - 400 (+bp*)
Opening Bid: £150
From Mammuthus Primigenius, showing root and interlocking vertical plates. 2.39 kg, 25 cm
From a Cambridgeshire, UK, collection. -
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Seymchan Meteorite Cross-Section
Circa 4.5 billion years B.P.Estimate: £6,000 - 8,000 (+bp*)
Opening Bid: £3,000
A magnificent polished cross-section from the Seymchan pallasite meteorite, revealing the honeycomb-like structure characteristic of pallasites, with translucent olivine crystals embedded within iron-nickel crystals; accompanied by a custom-made display stand. 356 grams, 23.2 cm
Discovered in 1967, recovered from the bed of the river Hekandue in the Magadan District, Russia (62° 54’ N, 152° 26’ E).
The main mass of 272.3 kilograms was found during a survey in June 1967 by geologist F. A. Mednikov. The mass was a triangular-shaped thumb-printed meteorite lying among the stones of the brook bed. A second specimen of 51 kilograms was found with a mine detector at a distance of 20 meters from the first in October 1967 by I. H. Markov. During a new expedition in 2004, Dmitri Kachalin recovered about 50 kilograms of new material. Remarkably, about 20% of the new specimens were found to contain olivine crystals, and so revealed the silicate nature of the meteorite. The pallasitic structure was not previously discovered during studies on small metal-only sections of the original mass. The distortion of the Widmanstatten patterns is interpreted as shearing of the superheated meteorite as it broke up in the Earth's atmosphere.
