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Obsidian

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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Category
Volcanic glass
Color
usually black; sometimes green or brown; rarely yellow, orange, red or blue
Fracture
Conchoidal
Luster
Vitreous
Melting point
700–1,050 °C (1,292–1,922 °F)[citation needed]
Mohs scale hardness
5–6

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Overview

Origin and properties

Occurrence

Prehistoric and historical use

Current use

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Map overview Semantic statistics

Obsidian

Nodes175
Edges174
Triples203
Avg. degree1.99
Density0.011429
Components1

How this topic connects Entity context

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Obsidian

Top relations

related to Occurrence · 53
Obsidian → Argentina, Arizona, Armenia, Australia, Azerbaijan, Big Obsidian Flow, California, Canada, Canary Islands, Cascade Range, Chile, Colorado, Ecuador, El Salvador, Georgia, Greece, Guatemala, Hungary, Iceland, Idaho
related to Americas · 31
Obsidian → Americas, Aztec Empire, California, Casa Diablo Hot Springs, Central Mexico, Chumash, Classic Period, Each, For, Green Pachuca, Hispanic, Hopewell, Hopewell Culture National Historical, Indigenous, Lithic, Maya, Mesoamerica, Mexica, Mission Santa Clara, Ohio
related to Europe · 25
Obsidian → Aegean Sea, Artifacts, Cardium-Impresso, Central Europe, Criș, Europe, European, Greece, Gyali, Hernando Cortés's, Hungary, John Dee, Körös, Mediterranean, Mexico, Middle Paleolithic, Milos, Neolithic, Nisyros, Slovakia
related to Prehistoric and historical use · 21
Obsidian → Acheulian, Anatolian, BC, BP, Croatia, Iraqi Kurdistan, It, Kariandusi, Kenya, Levant, Like, Lipari, Manufacture, Mesopotamian, Modern, Neolithic, Po, Sicily, Stone Age, Tell Brak
see also · 16
Obsidian → Ancient, Ancient Maya, Artificial, Desert, EgyptMayor Island, Form, Glassy, Helenite, Libya, Lintel, Maya, Mexico, Māori, New Zealand, Tūhua, Volcanic
related to Middle East and Asia · 11
Obsidian → Ancient Egyptians, BC, Bronze Age, In, Japan, Jōmon, Mediterranean, Red Sea, The, Turkey, Ubaid
related to Current use · 8
Obsidian → All, Don Crabtree, Drug Administration, FDA, One, The, US Food, Well-crafted
related to Oceania · 8
Obsidian → BC, Easter Island, Moai, Pacific Ocean, Rapa Nui, Rongorongo, The, The Lapita
related to Origin and properties · 8
Obsidian → Elder, Ethiopia, Extrusive, Intrusive, Obsidius, Pliny, Roman, The Natural History
Category · 1
Obsidian → Volcanic glass

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Important terminology

found lava glass used tools blades use volcanic made volcano artifacts also felsic may age mexico sources bc surgical high

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
ObsidianCategoryVolcanic glass1.00infobox
ObsidianColorusually black; sometimes green or brown; rarely yellow, orange, red or blue1.00infobox
ObsidianFractureConchoidal1.00infobox
ObsidianLusterVitreous1.00infobox
ObsidianMelting point700–1,050 °C (1,292–1,922 °F)[citation needed]1.00infobox
ObsidianMohs scale hardness5–61.00infobox
ObsidianOptical propertiesTranslucent1.00infobox
ObsidianOther characteristicsTexture: Smooth; glassy1.00infobox
ObsidianSpecific gravityc. 2.41.00infobox
siliconinstance ofobsidian is rich in the lighter elements0.80text
oxygeninstance ofobsidian is rich in the lighter elements0.80text
aluminiuminstance ofobsidian is rich in the lighter elements0.80text

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