Obsidian

Obsidian:    1. the c ol o r of obsidian rock can be dark brown, black, dark green, can show sheen's of gold or green, yellow, blue, and purple. sometimes with white ( snowflake).

2. Obsidian rock is formed when f   elsic lava rock extruded from a volcano cools without crystal growth.

3. the <span style="color: rgb(75, 229, 67);"><span style="color: rgb(191, 64, 64);"><span style="color: rgb(238, 124, 197);">texture   of obsidian rock is fine it is smooth and glassy. <span style="color: rgb(237, 236, 29);"> <span style="color: rgb(181, 64, 122);"><span style="color: rgb(237, 236, 29);">4. obsidian is an extrusive and it is felsic.

5. the rock breaks into sharp edges, almost in any color, very hard.

<span style="color: rgb(235, 239, 62);"><span style="color: rgb(244, 26, 26);"><span style="color: rgb(223, 17, 17);"><span style="color: rgb(225, 54, 45);"><span style="color: rgb(251, 70, 73);">6<span style="color: rgb(76, 23, 211);">. the hardness is 5-5.5 (softer then quartz,). The streak is white, open voids or large bubbles like volcanic rocks <span style="color: rgb(76, 23, 211);">, <span style="color: rgb(235, 25, 25);"><span style="color: rgb(195, 34, 39);">       <span style="color: rgb(187, 25, 235);"><span style="color: rgb(76, 23, 211);"><span style="color: rgb(222, 49, 33);">lack of crystal face. The texture is fine. It's shiny. 7. Obsidian occurs in Italy, Mexico, Scotland, ariszona, Colorado, Texas, Utah, Idaho, US and the Cascade volcanic mountain. <span style="color: rgb(203, 21, 21);">8. Obsidian is used for jewlery, ageing, tools ,

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 * <span style="font-size: 320%; color: rgb(10, 255, 79);">http://geology.com/rocks/pictures/obsidian.jpg
 * <span style="font-size: 320%; color: rgb(10, 255, 79);">http://www.swisseduc.ch/stromboli/perm/vulcano/icons/obsidian_sample1.jpg
 * <span style="font-size: 320%; color: rgb(10, 255, 79);">http://mineral.galleries.com/minerals/Mineralo/OBSIDIAN/OBSIDIAN.htm
 * <span style="font-size: 320%; color: rgb(10, 255, 79);">http://mineral.galleries.com/minerals/Mineralo/OBSIDIAN/OBSIDIAN.htm

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