SUPPORT US. Covid-19 has significantly affected our fundraising. Please help!
主页关于 MindatMindat手册Mindat的历史版权Who We Are联系我们于 Mindat.org刊登广告
捐赠给 MindatCorporate Sponsorship赞助板页已赞助的板页在 Mindat刊登 广告的广告商于 Mindat.org刊登广告
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe Elements书籍及杂志
搜索矿物的性质搜索矿物的化学Advanced Locality Search随意显示任何一 种矿物Random Locality使用minID搜索邻近产地Search Articles搜索词汇表更多搜索选项
Mindat手册添加新照片Rate Photos产区编辑报告Coordinate Completion Report添加词汇表项目
Mining Companies统计会员列表Mineral Museums矿物展及活动The Mindat目录表设备设置The Mineral Quiz
照片搜索Photo GalleriesSearch by Color今天最新的照片昨天最新的照片用户照片相集过去每日精选照片相集Mineral Photography


This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About ObsidianHide

black, bluish, mahogany, golden, peacock, etc. - the colors due largely to refraction by microscopic bubbles (and microscopic mineral inclusions such as magnetit in "Rainbow Obsidian").
Glassy, fresh igneous rocks with a high silica content and conchoidal fracture.
The earliest manufactured mirrors were pieces of polished obsidian.

Volcanic glass - a rock rather than a mineral, it is a mixture of cryptocrystalline grains of silica minerals in a glass-like suspension, a super-cooled liquid. Obsidian is formed in the latest stage of volcanic eruptions, the silica left over after most of the other elements and water have been used up are ejected or flow out and rapidly chilled at surface temperatures.

NOTE on "Transparent/Translucent Obsidian":
A lot of gem-quality water-clear variously coloured 'obsidian' has been offered for sale on the internet (in particular on auction websites) with a variety of sources listed. The material offered for sale is, in fact, an artificial glass mass-produced in places such as Indonesia.

Visit for gemological information about Obsidian.

Classification of ObsidianHide

Sub-divisions of ObsidianHide

Mineralogy of ObsidianHide

Essential minerals - these are minerals that are required within the classification of this rock:
GlassAn amorphous, homogeneous material with a random liquid-like structure generally formed due to rapid cooling.

Physical Properties of ObsidianHide

black, bluish, mahogany, golden, peacock, etc. - the colors due largely to refraction by microscopic bubbles (and microscopic mineral inclusions such as magnetit in "Rainbow Obsidian").

Synonyms of ObsidianHide

Other Language Names for ObsidianHide

Simplified Chinese:火山玻璃

Varieties of ObsidianHide

Fire ObsidianAn iridescent variety of obsidian. Its 'fire' is caused by thin layers of microcrystals of magnetite (which are approximately the thickness of a wavelength of light). The colour of Rainbow Obsidian occurs from a much thicker volume of the specimen (Nadin,...
Mahogany Obsidian
Rainbow ObsidianObsidian with multicolored iridescence caused by inclusions of magnetite nanoparticles (Nadin, 2007).
Sheen ObsidianA variety of obsidian exhibiting a golden sheen effect.
Snowflake ObsidianA rock - a natural volcanic glass containing white 'snowflake' crystal patterns of the mineral cristobalite, originated due to partial crystallisation of the glass.

Common AssociatesHide

Associated Minerals Based on Photo Data:
49 photos of Obsidian associated with CristobaliteSiO2
27 photos of Obsidian associated with Apache Tears
14 photos of Obsidian associated with FayaliteFe2+2SiO4
5 photos of Obsidian associated with Pyroxene Group
2 photos of Obsidian associated with QuartzSiO2
2 photos of Obsidian associated with Opal-CSiO2 · nH2O
1 photo of Obsidian associated with SpessartineMn2+3Al2(SiO4)3
1 photo of Obsidian associated with Rose QuartzSiO2
1 photo of Obsidian associated with Jasper
1 photo of Obsidian associated with Tiger's Eye

References for ObsidianHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Stevenson, R.J., Dingwell, D.B., Webb, S.L., and Bagdassarov, N.S. (1995) The equivalence of enthalpy and shear stress relaxation in rhyolitic obsidians and quantification of the liquid-glass transition in volcanic processes. Journal Volcan. Geotherm. Res.: 68: 297-306.
Gimeno, D. (2003) Devitrification of natural rhyolitic obsidian glasses: petrographic and microstructural study (SEM+EDS) of recent (Lipari island) and ancient (Sarrabus, SE Sardinia) samples. Journal of Non-Crystalline Solids, 323, 84-90.
Zotov, N. (2003) Structure of natural volcanic glasses: diffraction versus spectroscopic perspective. Journal of Non-Crystalline Solids 323, 1-6. (International Association for Obsidian Studies)

Internet Links for ObsidianHide URL:
Please feel free to link to this page.
矿物 and/or 产地  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
版权所有© mindat.org1993年至2020年,除了规定的地方。 Mindat.org全赖于全球数千个以上成员和支持者们的参与。
隐私政策 - 条款和条款细则 - 联络我们 Current server date and time: 2020.11.24 21:10:30 Page generated: 2020.11.23 07:55:56
Go to top of page