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17.83 CTS TOP GRADE MOLDAVITE NODULE -NATURAL [STS1779]

存貨單位
尺寸(毫米)
24.000 x 18.000 x 10.500mm
重量 (cts)
17.830
類型
Faceted
顏色

SEDAGEMS


MOLDAVITE NODULE

This is a natural untreated specimen hand selected  from a large parcel from a collector for it unique structure and quality.

It is app 14 million years old and it is from the Moldau valley in the Czeh republic.

Great piece for a collection.


Tektites (from Greek tektos, molten) are natural glass rocks up to a few centimeters in size, which most scientists argue were formed by the impact of large meteorites on Earth's surface. Tektites are typically black or olive-green, and their shape varies from rounded to irregular.


A moldavite tektite


The ages of tektites from the four strewnfields have been determined using radiometric dating methods. The age of moldavites, a type of tektite found in Czech Republic, was determined to be 14 million years, which agrees well with the age determined for the Nördlinger Ries crater (a few hundred kilometers away in Germany) by radiometric dating of Suevite (an impact breccia found at the crater). Similar agreements exist between tektites from the North American strewnfield and the Chesapeake Bay impact crater and between tektites from the Ivory Coast strewnfield and the Lake Bosumtwi-Crater.

Early non-terrestrial impact theories


Aerodynamically shaped Australite; the button shape caused by ablation of molten glass in the atmosphere.

Though the meteorite impact theory of tektite formation is widely accepted, minority theories propose alternate ideas of tektite formation.

Tektites contain no cosmogenic noble gases produced by cosmic rays, a factor that excludes long travel in space, necessary if tektites are not terrestrial. According to terrestrial-impact adherents, this makes a lunar origin unlikely, because it is hard to reconcile with finding cosmogenic noble gases in all lunar meteorites – a typical lunar meteorite taking about 1 million years to transfer from Moon to Earth. Furthermore, an origin from the Moon or other body cannot explain why many tektites are only found in confined areas unlike meteorites of lunar or other origin, which are found dispersed on the Earth's surface. Whether the Australasian and Ivory Coast tektites fit this thesis is debatable.

In particular, no tektite strewn field exists in Antarctica, where the flow of glaciers would sweep extraterrestrial material away. Since the Australasian strewnfield expands with each new tektite discovered on the southern seafloor, this tektite field may yet be found to reach as far as Antarctica, but regularly undertaken meteorite recovery expeditions in areas that accumulate extraterrestrial material have found only meteorites and no tektites at all. If tektites from space fall in Antarctica, a large part of the recovered material should instead be tektites and an existing strewnfield should already have been discovered. Conversely, the Australasian and Ivory Coast strewnfields have expanded over the decades as new tektites are found in sea sediments; they now reach toward the southern continent. Thus, it may be premature for terrestrial-origin proponents to say that tektites will never be discovered on Antarctica.


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sedagems
sedagems
MEMBER OF THE  [ICA] INTERNATIONAL COLOURED STONE ASSOCAITION AND PRESIDENT OF THE OPAL ASSOCIATION. PAUL SEDAWIE IS A FORMER OPAL MINER WHO NOW TRAVELS AROUND AUSTRALIA AND THE WORLD COLLECTION RARE AND INTERESTING GEMS TONES AND FOSSILS.ALL STOCK HAS A MONEY BACK GUARANTEE We have a retail shop/museum at the Gold Coast Opal and Gem Centre 25 surfers av mermaid waters Qld Australia .4218 open mon to sat 10 to 5
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投標歷史 (1)
rockhound231
之前從該賣家購買過
3 years ago
$38.00

為什麼用戶出價高於自己?

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當出現“自動出價”圖標時,表示我們的系統正在根據用戶的最高出價主動為用戶出價。這可能看起來好像用戶出價高於自己,但這只是系統更新出價以反映用戶最高限額的結果。

審計

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概述

列表類型 : Standard
產品編號 : 1127366
預計建議零售價 : $150.00
起拍價 : $38
開始 : 10th June 2020 10:05 am AEST
結束 : 13th June 2020 12:42 am AEST
* 所有價格均以:貨幣為單位