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![Large Group of Four Hundred [400] Cut and Polished Mini Agate Geode Halves](https://timelineauctions.com/zoom_images/zoomthumb/2/5/255956_900x900.jpg "Large Group of Four Hundred [400] Cut and Polished Mini Agate Geode Halves")
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![Large Group of Four Hundred [400] Cut and Polished Mini Agate Geode Halves](https://timelineauctions.com/upload/images/items/255956.jpg "Large Group of Four Hundred [400] Cut and Polished Mini Agate Geode Halves")
LOT 2512
Large Group of Four Hundred [400] Cut and Polished Mini Agate Geode Halves
5/8 - 1 5/8 in. (2.02 kg total, 16-40 mm).
Large group of cut geodes with internal cavities, most with crystal-lined interiors. [400, 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 2512
Large Group of Four Hundred [400] Cut and Polished Mini Agate Geode Halves
Estimate £50 - 70€58 - 81 (for guidance only)$68 - 95 (for guidance only)
Opening Bid
£5 (EUR 6; USD 7) +BP*
-
Polished Fossil Tree Section
Triassic Period, 251-199 million years B.P.Estimate: £30 - 40 (+bp*)
Opening Bid: £5
Thick free-standing section of agatised wood. 964 grams, 10.9 cm
From a Cambridgeshire, UK, collection. -
Large Amethyst and Quartz Crystal Display
Circa 120-140 million years B.P.Estimate: £2,000 - 3,000 (+bp*)
Opening Bid: £11,100
An ovoid geode section with large prismatic quartz and light purple amethyst crystals with colour concentrations at the peak of the terminations; mounted on a custom-made display stand. 14.75 kg, 37.5 x 25 x 17 cm, 52 cm including stand
From Artigas, Uruguay. Property of a London lady. -
Morton Gneiss Plate Sections
Circa 3.5 billion years B.P.Estimate: £40 - 60 (+bp*)
Opening Bid: £5
Comprising three rectangular sections of grey pink and black medium to coarse-grained biotite-quartz-plagioclase gneiss with polished upper face, each with wooden backing and one cracked. approx. 84 kg total, 85 x 58 cm each
Canadian Shield, Minnesota River Valley, Southwestern Minnesota, USA. with Phillips, New York, 3 June 1995, no.81. Private collection, Florida, acquired at the above sale. with Sotheby’s, New York, 28 April 2021, no.27 (est. $2,500–3,500).
The world’s oldest known rocks come from the Canadian Shield area of North America. Among the most ancient is the present material, Morton Gneiss at approximately 3.5 billion years old believed to be part of Earth’s first planetary crust. The swirls and layers are a result of metamorphism that incurred when the original volcanic rock was buried to tremendous depths.
