The Rocks & Minerals Challenge Game
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Review Rocks by Pictures and Attributes Review Minerals by Pictures and Attribute
Rocks: Drag & Drop -Identify by Name Minerals: Drag & Drop -Identify by Name
Rocks: Fill-In Minerals: Fill-In
Rocks: Advance Minerals: Advance
 
Rock Identification by Picture and Attribute
Explorers! Before you begin your journey, you need to recognize these geological specimens.
 
Begin by selecting one of the specimens pictured.
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Metamorphic
      
     
Igneous
          
Sedimentary
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Name: Obsidian
Classification: Igneous
Alternate Specimen(s)
Fichter, Lynn S. James Madison University
Texture/Color:
glassy/ black, red
Minerals Present: none
Intrusive or Extrusive? extrusive
About this rock: With glass as a main component, obsidian is sometimes defined as being a glassy volcanic rock. Most commonly associated with silica-rich lavas (rhyolite, etc.) Obsidian may be found as the glassy place of any lava.
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Igneous
    
Sedimentary
      
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