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LOT 2408
Massive Deep Purple Amethyst Crystal Geode Display
CIRCA 140-120 MILLION YEARS B.P.
24 3/4 x 28 1/4 x 14 1/2 in. (177 kg, 63 x 72 x 37 cm).
A large freestanding geode display with polished edges, the interior lined with rich, deep purple amethyst crystals.
ProvenanceFrom Artigas, Uruguay.
Property of a London lady.
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AUCTIONS:
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LOT 2408
Massive Deep Purple Amethyst Crystal Geode Display
Estimate £5,000 - 7,000€5,800 - 8,120 (for guidance only)$6,750 - 9,450 (for guidance only)
Opening Bid
£2,750 (EUR 3,190; USD 3,713) +BP*
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Fossil Otarion Trilobite on Matrix
Silurian-Devonian Period, circa 425-400 million years B.P.Estimate: £40 - 60 (+bp*)
Opening Bid: £5
Showing high stalked eyes, elongated spines and granulose bulbous cephalon. 115 grams, 58 mm
From a Cambridgeshire, UK, collection. -
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Large Iridescent Placenticeras Ammonite from Alberta
Bear Paw Formation, Upper Cretaceous Period, circa 76-73 million years B.P.Estimate: £4,500 - 6,500 (+bp*)
Opening Bid: £2,250
Placenticeras costatum with gem quality fossilised shell with some visible suture lines, conserved and stabilised with natural polish and acrylic lacquer, with excellent iridescence showing red, green, orange and gold colours. 952 grams, 26 cm
Found St Mary River Valley, Lethbridge Mining District, Alberta, Canada. Property of a Bristol, UK, gentleman collector. Accompanied by a certificate of authenticity, exportable under Moveable Cultural Property Permit no.7021-25-12-22-0102.
The striking iridescence of these ammonites from Alberta, Canada, termed 'ammolite', was given the status of a gemstone by CIBJO in 1981. An iridescent opal-like play of colour is shown in fine specimens, and is caused by the microstructure of aragonite, the same mineral contained in pearls and nacre. The thicker the structural layers, the more reds and greens are produced; the thinner the layers, the more blues and violets predominate. The ammonites are a group of molluscs that lived in the seas from the mid-Devonian (approximately 400 million years ago) to the end of the Cretaceous (65 million years ago). The sequence of events that famously killed off the dinosaurs also drove the ammonites to extinction. -
Cathedral Geode Half with Amethyst and Calcite Crystals
Estimate: £1,800 - 2,400 (+bp*)
Opening Bid: £900
The cathedral lined with large deep purple amethyst crystals, white dog tooth calcite crystals emerging from the left corner; mounted on a custom-made display stand. 17.35 kg, 35 cm
From Artigas, Uruguay. Property of a London lady.
