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LOT 2782
Quartz Crystal with Graphite with Moving Bubble Mineral Display Specimen
3 1/4 in. (100 grams, 83 mm).
A double terminated quartz crystal with graphite inclusions, a large liquid-filled cavity on one side in which the graphite particles are moving freely. [No Reserve]
ProvenanceFrom Cong Li, Hunan Province, China.
Property of a North West London, UK, lady.
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AUCTIONS:
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LOT 2782
Quartz Crystal with Graphite with Moving Bubble Mineral Display Specimen
Sold for (Inc. bp): £312
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Goethite Crystal Mineral Display Specimen
Sold for (Inc. bp): £20
A mass of iron-rich goethite crystals. 270 grams, 79 mm
Property of a North West London, UK, lady. -
Crystal and Mineral Display Specimen Collection
Sold for (Inc. bp): £26
A mixed group comprising calcite, quartz, amethyst, agate, a cut and polished ammonite, and others. 1.22 kg total, 39-88 mm
Property of a North West London, UK, lady. -
Spherical Sedimentary Concretion
Sold for (Inc. bp): £20
Naturally formed from hardened sediment with projecting porous, black stone nodules. 647 grams, 10.2 cm
Acquired on the UK art market in the 1990s. From the Dr Ince collection, N.W. London, UK.
A concretion is a compact mass of mineral matter, usually spherical or disc-shaped, and they vary greatly in size. They usually form early in the burial history of sediment, before the rest of the sediment has hardened into solid rock. Concretions occur when a considerable amount of cementing material collects locally around a nucleus, often organic (a leaf, tooth, a section of fossil or shell or dead matter) and commonly a marine invertebrate.
