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$24.00 USD
Precio

50.8CTS A GRADE RAINBOW OBSIDIUM SLAB [F5754 ]

2576
2

SKU
Dimensiones (mm)
38.000 x 24.000 x 9.000mm
Peso (cts)
50.800
Tipo
Rough
Colores

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
CategoryVolcanic glass
Formula (repeating unit)70–75% SiO2, plus MgO, Fe3O4
Identification
ColorDeep black or blackish green
FractureConchoidal
Mohs scale hardness5–6[1]
LusterVitreous
Specific gravity~2.4[2]
Optical propertiesTranslucent
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

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Resto del mundo
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sedagems
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
Mermaid Waters , Australia
Verificado
19215 de comentarios

  • opalgoat
    opalgoat
    Positivo

    Well packaged, beautiful gems

  • opalgoat
    opalgoat
    Positivo

    Well packaged, beautiful gems

  • opalgoat
    opalgoat
    Positivo

    Well packaged, beautiful gems

  • opalgoat
    opalgoat
    Positivo

    Well packaged, beautiful gems

  • opalgoat
    opalgoat
    Positivo

    Well packaged, beautiful gems

10%
Código promocional SEDADEALS
Válido hasta
4th Mar 2025

Auditoría

El programa Gemstone Sheriff permite a nuestros miembros solicitar una auditoría de cualquier producto, que es realizada por un Gemologist independiente que evalúa la precisión de la descripción del artículo y las imágenes.

Detalles de envío

Envío:
$16.00 21 días a través de Registered Shipping
Se envía desde:
Australia

Opciones de pago

  • paypal
  • stripe
Este vendedor agrega 10.00% a las transacciones en Australia .

Descripción general

Tipo de listado : Standard
ID del Producto : 492584
Empieza : 12th February 2025 08:02 pm PST
* Todos los precios están en USD

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