Obsidian
Obsidian
Obsidian
| Colour, characteristics: | Colour always dark, brown to black, rarely dark green. Translucent grey at edges. |
| Formation: | By rapid cooling of a gas-rich but so viscous rock melt that the gases could not escape and remained in the rock. Occurs as a crust on lava flows, as ejecta or as the outer shell of swollen volcanic domes. The variety known commercially as snowflake obsidian contains spherical inclusions of radially arranged minerals that have grown radially into the molten rock, which was still hot at the time. |
| Locations: | Italy (Lipari Islands), Turkey (Anatolia), Hungary, Iceland, Java, Japan, USA (New Mexico, Wyoming, Utah, Texas) <!--[if gte mso 9]><xml> <w:latentstyles deflockedstate="false" defunhidewhenused="true" defsemihidden="true" defqformat="false" defpriority="99" latentstylecount="267"> <w:lsdexception locked="false" priority="0" semihidden="false" unhidewhenused="false" qformat="true" name="Normal"></w:lsdexception> <w:lsdexception locked="false" priority="9" semihidden="false" unhidewhenused="false" qformat="true" name="heading 1"></w:lsdexception> <w:lsdexception locked="false" priority="9" qformat="true" name="heading 2"></w:lsdexception> <w:lsdexception locked="false" priority="9" qformat="true" name="heading 3"></w:lsdexception> <w:lsdexception locked="false" priority="9" qformat="true" name="heading 4"></w:lsdexception> <w:lsdexception locked="false" priority="9" qformat="true" name="heading 5"></w:lsdexception> <w:lsdexception locked="false" priority="9" 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| Products: | Formerly used for tools and weapons. Today, obsidian is used for sculptures, cult objects and costume jewellery. |