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$36.00 USD
価格
5375
6

112.7 CTS A GRADE RAINBOW OBSIDIUM SLAB [F5715 ]

SKU
寸法(mm)
50.000 x 37.000 x 9.000mm
重さ (CT)
112.700
タイプ
Rough

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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sedagems
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.
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  • js20031
    js20031
    ポジティブ

    AAAA+++ Very Happy! Just like the pic.

  • js20031
    js20031
    ポジティブ

    AAAA+++ Very Happy! Just like the pic.

  • wesam
    wesam
    ポジティブ

    Very nice stone

5.00%
クーポンコード SEDADEALS
まで有効
7th Nov 2024

監査

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発送詳細

配送:
$16.00 Registered Shipping 経由の日数をカウント
発送元:
Australia

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この出品者は、Australia での取引に 10.00% 税金を追加します。

概要

リストタイプ : Standard
製品番号 : 492534
始まります : 23rd October 2024 07:51 pm PDT
* すべての価格は:通貨で表示されます