Opals
Gemstones
Jewelry
Coins
Sie haben bei dieser Auktion nicht geboten.
86.1 CTS A GRADE RAINBOW OBSIDIUM SLAB [F5724 ]
- Artikelnummer
- Abmessungen (mm)
- 39 x 37 x 7mm
- Gewicht (cts)
- 86.1
- Type
- Rough
- Farben
-
QUALITY ROUGH
A GRADE OBSIDIUM SLAB
This is a piece we cut off a rough specimen at app 45 degree angle to expose the amazing patterns.Great cutting experience.We have taken the photo with the rough wet.
| General | |
|---|---|
| Category | Volcanic glass |
| Formula (repeating unit) | 70–75% SiO2, plus MgO, Fe3O4 |
| Identification | |
| Color | Deep black or blackish green |
| Fracture | Conchoidal |
| Mohs scale hardness | 5–6[1] |
| Luster | Vitreous |
| Specific gravity | ~2.4[2] |
| Optical properties | Translucent |
| References | [3] |
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.
It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) induces a high viscosity and polymerization degree of the lava. The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth. Obsidian is hard and brittle; it therefore fractures with very sharp edges, which were used in the past in cutting and piercing tools, and has been used experimentally as surgical scalpel blades. It may contain patterns of gas bubbles remaining from the lava flow, aligned along layers created as the molten rock was flowing before being cooled. These bubbles can produce interesting effects such as a golden sheen (sheen obsidian). An iridescent, rainbow-like sheen (rainbow obsidian) is caused by inclusions of magnetite nanoparticles
| Versandanbieter | Versand nach Australien | Versand in den Rest der Welt | Kombiversand ( Australien ) | Kombiversand (Rest der Welt) |
|---|---|---|---|---|
| FedEx |
|
|
|
|
| Registered Shipping |
|
|
|
|
- Artikelnummer
- Abmessungen (mm)
- 39 x 37 x 7 mm
- Gewicht (cts)
- 86.1
- Type
- Rough
- Farben
-
QUALITY ROUGH
A GRADE OBSIDIUM SLAB
This is a piece we cut off a rough specimen at app 45 degree angle to expose the amazing patterns.Great cutting experience.We have taken the photo with the rough wet.
| General | |
|---|---|
| Category | Volcanic glass |
| Formula (repeating unit) | 70–75% SiO2, plus MgO, Fe3O4 |
| Identification | |
| Color | Deep black or blackish green |
| Fracture | Conchoidal |
| Mohs scale hardness | 5–6[1] |
| Luster | Vitreous |
| Specific gravity | ~2.4[2] |
| Optical properties | Translucent |
| References | [3] |
Obsidian is a naturally occurring volcanic glass formed as an extrusive igneous rock.
It is produced when felsic lava extruded from a volcano cools rapidly with minimum crystal growth. Obsidian is commonly found within the margins of rhyolitic lava flows known as obsidian flows, where the chemical composition (high silica content) induces a high viscosity and polymerization degree of the lava. The inhibition of atomic diffusion through this highly viscous and polymerized lava explains the lack of crystal growth. Obsidian is hard and brittle; it therefore fractures with very sharp edges, which were used in the past in cutting and piercing tools, and has been used experimentally as surgical scalpel blades. It may contain patterns of gas bubbles remaining from the lava flow, aligned along layers created as the molten rock was flowing before being cooled. These bubbles can produce interesting effects such as a golden sheen (sheen obsidian). An iridescent, rainbow-like sheen (rainbow obsidian) is caused by inclusions of magnetite nanoparticles
| Versandanbieter | Versand nach Australien | Versand in den Rest der Welt | Kombiversand ( Australien ) | Kombiversand (Rest der Welt) |
|---|---|---|---|---|
| FedEx |
|
|
|
|
| Registered Shipping |
|
|
|
|
![86.1 CTS A GRADE RAINBOW OBSIDIUM SLAB [F5724 ]](https://liveplatforms-production.b-cdn.net/tenants/gr/uploads/stores/ipha4mneys1w7gnr.png)
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and g....
-
PositivPaid and shipped - no feedback left after 100 days
![86.1 CTS A GRADE RAINBOW OBSIDIUM SLAB [F5724 ]](https://liveplatforms-production.b-cdn.net/tenants/gr/uploads/images/490000-494999/492544/553711a3b037a.JPG?width=480&aspect_ratio=1001%3A1000)
-
Positiv
Nice ruby-sapphire stones, good pictures.
-
Positiv
Everything was Awesome! Thank you so much for everything! It's always an absolute pleasure buying from you, and will be doing it again soon. Take care and all the best for the new year!
-
Positiv
The Pendant is fantastic!
-
Positiv
Absolutely smashing books, the opals are magnificent! Thank you so much for everything, will be buying from you again soon. Thank you, again!
-
Positiv
The Pendant is breathtaking! Thanks!
Warum überbieten sich Nutzer selbst?
Wenn ein Gebot abgegeben wird, ist dies der Höchstbetrag, den eine Person für das Produkt bieten möchte. Unser System bietet dann automatisch im Namen des Bieters und erhöht das Gebot schrittweise bis zum Höchstbetrag, um die Position des Höchstbietenden beizubehalten.
Wenn ein Symbol mit der Aufschrift „Automatisches Gebot“ angezeigt wird, bedeutet dies, dass unser System aktiv Gebote für den Bieter basierend auf seinem Höchstgebot abgibt. Dies kann so aussehen, als würden die Bieter sich selbst überbieten, aber es ist lediglich das Ergebnis der Aktualisierung des Gebots durch das System, um das Höchstlimit des Bieters widerzuspiegeln.
