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_900x900.jpg "Optical Calcite Mineral Specimen Collection")
_200x200.jpg "Optical Calcite Mineral Specimen Collection")
.jpg "Optical Calcite Mineral Specimen Collection")
LOT 2774
Optical Calcite Mineral Specimen Collection
5/8 - 7/8 in. (170 grams total, 18-22 mm).
A group of ten optical calcite specimens, each held in a white card collector's tray. [10, No Reserve]
ProvenanceDurango, Mexico.
Mineral Imports, London, UK.
Gregory, Bottley & Lloyd (Gregory's).
TimeLine Auctions follows a vetting process to ensure the authenticity and legality of all items, reinforcing our commitment to integrity and responsible trading. Each antiquity, antique, and coin lot undergoes thorough examination by a vetting committee of at least ten external specialists, professional trade association members, scientists, and archaeologists: Our Vetting Process
AUCTIONS:
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![Collection of Twenty [20] Assorted Mineral Specimens](https://timelineauctions.com/upload/images/items/small/250980-s.jpg)
Collection of Twenty [20] Assorted Mineral Specimens
Sold for (Inc. bp): £46
A boxed collection comprising: a very dark and large smoky quartz specimen; three dark green tourmaline specimens, one bicoloured tourmaline specimen; a grossular garnet from Chihuahua, Mexico; dog tooth calcite; red jasper, banded fluorite, agate; carnelian, light grey smoky quartz, and others. 2.06 kg total including box, 1.4-14.4 cm
Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK. -
Bismuth Crystal Specimen
Sold for (Inc. bp): £26
Cluster of hopper crystals exhibiting a stairstep crystal structure and iridescent colours. 20.5 grams, 45.4 mm
From a Cambridgeshire, UK, collection. -
Fossil Knightia Fish in Matrix
Eocene Period, circa 58-36 million years B.P.Sold for (Inc. bp): £91
A Knightia alta fish on a rectangular limestone matrix. 589 grams, 17.8 cm
From a Cambridgeshire, 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 Ulinta, 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.
