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![Large Group of Forty-Two [42] Cleaved Optical Calcite Specimens](https://timelineauctions.com/zoom_images/zoomthumb/2/5/255972_900x900.jpg "Large Group of Forty-Two [42] Cleaved Optical Calcite Specimens")
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LOT 2515
Large Group of Forty-Two [42] Cleaved Optical Calcite Specimens
1 - 1 5/8 in. (1.54 kg total, 24-42 mm).
Comprising forty-two calcite rhombs displaying characteristic double refraction. [42, No Reserve]
ProvenanceEx Mineral Imports, London, UK.
Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.
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AUCTIONS:
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LOT 2515
Large Group of Forty-Two [42] Cleaved Optical Calcite Specimens
Estimate £30 - 40€35 - 46 (for guidance only)$41 - 54 (for guidance only)
Opening Bid
£5 (EUR 6; USD 7) +BP*
-
Knightia Multiple Fossil Fish Plate
Eocene Period, circa 58-36 million years B.P.Estimate: £30 - 40 (+bp*)
Bids: 1 | Current Bid: £5
An oval plate with four Knightia alta specimens. 161 grams, 13.8 cm
From Wyoming, USA. From a Lincolnshire, UK, collection.
In southwest Wyoming (and parts of Colorado and Utah), in the Green River Formation, are found some of the world's most outstanding specimens of fossil fish. The Green River system was composed of three lakes: Lake Uinta, Lake Gosiute and Fossil Lake. These Eocene lakes lay in a series of intermountain basins formed by geological events that uplifted the Rocky Mountains during the early Tertiary time. The climate was much different from the desert-like climate of this area today. Both the fauna (crocodiles, alligators, boa constrictors and some subtropical fish families) and the flora (such as large palm trees) indicate a climate much like that found along the Gulf Coast today. Large amounts of ash found in the sediments indicate that volcanoes were particularly active at this time. -
Polished 'Orca' Agate Display Piece
Estimate: £30 - 40 (+bp*)
Bids: 2 | Current Bid: £10
Polished freestanding stone with attractive white formations against a dark background. 554 grams, 99 mm
From a Cambridgeshire, UK, collection. -
Large Agadir Ammonite Display with Cut Base
Cretaceous Period, circa 145-66 million years B.P.Estimate: £100 - 140 (+bp*)
Opening Bid: £5
With a cut base and showing characteristic ribbing, possibly Calycoceras. 5.67 kg, 23.5 cm wide
From a Cambridgeshire, UK, collection.
