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Ring Boulderopal / Cabochon / neu

In 925. Sterlingsilber gefasst

19,5 mm x 18,3 mm

Gewicht: 6,80 g / 34 ct

Neu und ungetragen

Ringgröße:  

U 57
UK P 1/2 
US 8,0
Fr 17
Innendurchmeser: 18,1 mm

Mit Boulderopal werden Edelopale bezeichnet, die in Adern und Rissen des umgebenden Muttergesteins eingebettet sind. Bei diesem wertvollen Edelstein aus dem Outback gehört das Muttergestein, die Matrix, dazu. Der edle Opal lässt sich nicht von seinem Muttergestein trennen. Der Anteil des Edelopals auf der sichtbaren Oberfläche des Boulderopals bestimmt den Wert des Edelsteins. 

Boulderopale kommen ausschließlich in Queensland (Australien) vor. In einem 300 km x 1000 km breiten Verbreitungsgebiet werden an verschiedenen Fundorten abbauwürdige Boulderopal - Vorkommen abgebaut. Dieser Opal Gürtel entspricht der kreidezeitlichen Winton – Formation. Ab der ausgehenden Kreidezeit verwitterten Ablagerungen aus Flüssen und Seen und bildeten eine eisenhaltige Zone, in der sich in Grundwassernähe kieselsäurehaltige Ausfällungen aus den darüber liegenden Schichten in Rissen und Spalten sammelten. Dort verdichteten sie sich durch Austrocknung zu Gel und schließlich zu sekundär entstandenem Opal.

Versand als versichertes Einschreiben.

Australia

Boulder Opal Ring / Cabochon / new- 6.8 g - (1)

Minerals & Meteorites

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Material

Silver

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As new - unused

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Period

Paleogene, Eocene (56 - 33.9 million years)

Neogene, Miocene (23.03 - 5.33 million years)

2020+

Paleogene, Oligocene (33.9 - 23.03 million years)

Cretaceous, Upper (100.5 - 66 million years)

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Cretaceous, Lower (145 - 100.5 million years)

Ordovician (485.4 - 443.8 million years)

Cenozoic (66 - 0 million years)

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Boulder Opal Ring / Cabochon / new- 6.8 g - (1)

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