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Opal (Var: Milk Opal) : SiO2·nH2O | |
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Belas, Luanda Province, Angola Sample with 7x8x9cm - July of 1974 |
| © Martins da Pedra | Photo ID: 53656 View Count: 861 |
Opal (Var: Wood Opal) : SiO2·nH2O | |
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Belas, Luanda Province, Angola Sample with 10x6x4cm - July of 1974 |
| © Martins da Pedra | Photo ID: 53653 View Count: 687 |
Opal (Var: Wood Opal) : SiO2·nH2O | |
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Belas, Luanda Province, Angola Sample with 5x4x2cm - July of 1974 |
| © Martins da Pedra | Photo ID: 53655 View Count: 630 |
Opal (Var: Wood Opal) : SiO2·nH2O | |
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Belas, Luanda Province, Angola Sample with 8x6x4cm - July of 1974 |
| © Martins da Pedra | Photo ID: 103566 View Count: 466 |
Opal : SiO2·nH2O | |
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Rio de los Sauces, Mina Clavero, Córdoba, Argentina Milk Opal. Intense fluorescence yellow-green (LW UV). Contains traces of uranium. |
| Photo ID: 131414 View Count: 451 | |
Opal (Var: Wood Opal) : SiO2·nH2O | |
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Colón, Entre Ríos, Argentina Petrified fruit cut and polished. Size of the specimen on the left: 5.0 x 4.0 cm. Size of the specimen on the right: 4.5 x 3.9 cm. |
| © JCLodovichi | Photo ID: 22616 View Count: 1432 |
Opal : SiO2·nH2O | |
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Grawin Opal Field, Grawin, Finch Co., New South Wales, Australia Precious opal with a polished face. Size as per scale bar. |
| © crocoite.com | Photo ID: 216791 View Count: 143 |
Precious Opal (Var: Black Opal) : SiO2·nH2O | |
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Lightning Ridge, Finch Co., New South Wales, Australia Here is a gem black opal in the colours red,blue,green. The size is 10x9mm. Photo, John Nijhuis. |
| © J.N | Photo ID: 45172 View Count: 932 |
Opal : SiO2·nH2O | |
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Lightning Ridge, Finch Co., New South Wales, Australia Transparent, "jelly opal" formed in red sandstone from this world class opal locality. Here we have a nicely presented opal pocket in matrix, flashign colors at you as you turn it in light. It is extremely gemmy and transparent! 5.6 x 4.5 x 3.2 cm |
| © Rob Lavinsky | Photo ID: 39563 View Count: 830 |
Opal (Var: Precious Opal) : SiO2·nH2O | |
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Lightning Ridge, Finch Co., New South Wales, Australia Field of view: 10 mm Photo and collection Antonio Borrelli |
| © Antonio Borrelli | Photo ID: 58557 View Count: 795 |
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