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LOT 0412
Agatised Amethyst Crystal Geode Section with Polished Exterior
25 1/2 in. (24 kg total, 64.5 cm high including stand).
The borders polished to emphasise the beautiful agatised layers; the inside cavity lined with purple amethyst, creamy calcites and white quartz, creating a frosted appearance; accompanied by a custom-made display stand.
ProvenanceFrom Artigas, Uruguay.
Property of a London lady.
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AUCTIONS:
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LOT 0412
Agatised Amethyst Crystal Geode Section with Polished Exterior
Sold for (Inc. bp): £2,600
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Natural Boulder Sapphire Group
Sold for (Inc. bp): £7
Comprising five light blue specimens, three with cut faces, one showing clear hexagonal banding. 112 grams total, 25-36 mm
Ex property of a UK gallery, early 2000s. -
Morton Gneiss Plate Sections
Circa 3.5 billion years B.P.Sold for (Inc. bp): £286
Comprising four 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. 233.7 kg total, 85 x 57.7 - 85 x 58 cm
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. -
Calcite Crystal Mineral Display Specimen
Sold for (Inc. bp): £13
A large specimen of calcite. 1.81 kg, 94 mm
Property of a North West London, UK, lady.
