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價格

28 CTS A GRADE RAINBOW OBSIDIUM SLAB [F5728 ]

存貨單位
尺寸(毫米)
30.000 x 28.000 x 5.000mm
重量 (cts)
28.000
類型
Rough
顏色

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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mineralgemworld
mineralgemworld
MEMBER OF THE [ICA]  INTERNATIONAL COLOURED STONE ASSOCIATION AND PRESIDENT OF THE OPAL ASSOCIATION. We have a retail shop/museum at the Gold Coast Opal and Gem Centre 25 surfers av mermaid waters Qld Australia .4218 open mon to sat 10 to 5
:城市,國家
已驗證
:總反饋

8.00%
優惠券代碼 GEMSONSALE
有效期至
21st Apr 2024

審計

Gemstone Sheriff計劃允許我們的會員請求對任何產品進行審核,該審核由獨立的 Gemologist 人員完成,該資格人員評估商品描述和圖片的準確性。

送貨細節

船運:
$16.00 :通過 Registered Shipping 計算天數
發貨自:
Australia

付款方式

  • paypal
  • stripe
該賣家在 Australia 的交易中添加 10.00% 稅。

概述

列表類型 : Standard
產品編號 : 492550
開始 : 27th March 2024 08:19 pm PDT
* 所有價格均以:貨幣為單位