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LOT 2483
White Quartz Geode Slice with Amethyst Core
CIRCA 140-120 MILLION YEARS B.P.
13 3/8 x 9 3/4 x 3/4, 20 1/2 in. (4.54 kg, 34 x 25 x 2cm, 52 cm including stand).
Cut and polished slice showing dense intergrown layer of white quartz crystals, the centre with groups of small lavender-coloured amethyst crystals; mounted on a custom-made display stand.
ProvenanceFrom Artigas, Uruguay.
Property of a London lady.
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AUCTIONS:
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LOT 2483
White Quartz Geode Slice with Amethyst Core
Estimate £800 - 1,000€930 - 1,160 (for guidance only)$1,080 - 1,350 (for guidance only)
Opening Bid
£440 (EUR 510; USD 594) +BP*
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Mosasaur 'Marine Dinosaur' Fossil Jaw Fragment
Cretaceous Period, circa 145-65 million years B.P.Estimate: £60 - 80 (+bp*)
Bids: 4 | Current Bid: £20
Large fragment of a jaw with four teeth. 132 grams, 14.7 cm
From a Cambridgeshire, UK, collection.
The Mosasaur is an extinct, large marine reptile dinosaur with an elongated body, long snout and paddle-like limbs. Found worldwide, they competed with other well-known sea predators of the Late Cretaceous, such as plesiosaurs and ichthyosaurs, for food, existing primarily on a diet of ammonoids, cuttlefish and fish. -
Historic Roman 'Spartan Basalt' Cut Green Porphyry Strip Group
Estimate: £80 - 100 (+bp*)
Bids: 3 | Current Bid: £55
Cut and polished sections, mined in Greece, cut and polished on both sides, probably recycled material mined in ancient Roman times. 225 grams total, 4.4-15.1 cm
Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.
Also known as Lapis Lacedaemonius and Porfido Verde Antico, a type of green porphyry quarried in Greece. Spartan basalt is a form of andesite or volcanic rock known today only from a single source in the village of Krokees on the Peloponnese in Greece. In addition, ancient sources mention a quarry of Lapis Lacedaemonius in Taygetus. -
Knightia Fossil Fish Plate Group
Eocene Period, circa 58-36 million years B.P.Estimate: £40 - 60 (+bp*)
Opening Bid: £5
Comprising three circular plates, each with a Knightia alta fish, and a fourth plate with small remains of one. 165 grams total, 71-80 mm
From Wyoming, USA. From a Lincolnshire, UK, collection.
In southwest Wyoming (and parts of Colorado and Utah), in the Green River Formation, are found some of the world's most outstanding specimens of fossil fish. The Green River system was composed of three lakes: Lake Uinta, Lake Gosiute and Fossil Lake. These Eocene lakes lay in a series of intermountain basins formed by geological events that uplifted the Rocky Mountains during the early Tertiary time. The climate was much different from the desert-like climate of this area today. Both the fauna (crocodiles, alligators, boa constrictors and some subtropical fish families) and the flora (such as large palm trees) indicate a climate much like that found along the Gulf Coast today. Large amounts of ash found in the sediments indicate that volcanoes were particularly active at this time.
