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LOT 2657
Large Quartz Crystal Geode Slab
7 5/8 in. (596 grams, 19.5 cm).
A teardrop-shaped geode section with quartz crystals with dark inclusions. [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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![Large Cut Malawi Agate Boulder Section Pair [2]](https://timelineauctions.com/upload/images/items/small/227887-s.jpg)
Large Cut Malawi Agate Boulder Section Pair [2]
Sold for (Inc. bp): £7
Comprising two cut slices with one polished face displaying attractive multicoloured banding. 2.75 kg total, 30.5-31 cm
From Malawi. Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK. -
Staurolite Mineral Specimen
Sold for (Inc. bp): £7
Comprising lustrous brown twinned crystals on sparkly muscovite schist. 147 grams, 80 mm
From Keyvy, Murmansk, Russia. Acquired from Don Edwards, Derbyshire, UK. 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. -
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Large Rainbow-coloured Carborundum Crystal Display Specimen
Sold for (Inc. bp): £33
A large cluster of silicon carbide showing beautiful iridescence. 1 kg, 16 cm
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.
Carborundum rarely occurs in nature, but is commercially formed by heating carbon and silicon at very high temperatures, producing extremely strong bands of crystals.
