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Obsidian (/əb.ˈsɪd.i.ən, ɒb.-/, əb-SID-ee-ən ob-) is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. Produced from felsic lava, obsidian is rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the…
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Obsidian | Category | Volcanic glass | 1.00 | infobox |
| Obsidian | Color | usually black; sometimes green or brown; rarely yellow, orange, red or blue | 1.00 | infobox |
| Obsidian | Fracture | Conchoidal | 1.00 | infobox |
| Obsidian | Luster | Vitreous | 1.00 | infobox |
| Obsidian | Melting point | 700–1,050 °C (1,292–1,922 °F)[citation needed] | 1.00 | infobox |
| Obsidian | Mohs scale hardness | 5–6 | 1.00 | infobox |
| Obsidian | Optical properties | Translucent | 1.00 | infobox |
| Obsidian | Other characteristics | Texture: Smooth; glassy | 1.00 | infobox |
| Obsidian | Specific gravity | c. 2.4 | 1.00 | infobox |
| silicon | instance of | obsidian is rich in the lighter elements | 0.80 | text |
| oxygen | instance of | obsidian is rich in the lighter elements | 0.80 | text |
| aluminium | instance of | obsidian is rich in the lighter elements | 0.80 | text |
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