Black Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Apache Tear (Obsidian)
Obsidian (Si02 - Amorphous Silicate)
igneous
Obsidian (Apache Tear)
Amorphous Volcanic Glass (SiO2)
igneous
Chalcopyrite
Chalcopyrite (CuFeS2)
Mineral
Quartz (Iron-Stained or Milky)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Vitreous Volcanic Rock (Amorphous Silicate), SiO2
igneous
Rhyolite
Rhyolite
igneous
Green Aventurine (Green Quartz)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Mineral/Metamorphic rock
Iron-stained Quartz Vein
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Wonderstone (Liesegang Sandstone)
Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))
sedimentary
Quartz Nut
SiO2 (Silicon Dioxide)
mineral health
Mahogany Obsidian
Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2
igneous
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Chert (Flint Nobule)
Silicon Dioxide (SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Raw Diamond (Rough Uncut)
Diamond (C - pure carbon)
mineral
Rhyolite
Rhyolite (Extrusive Igneous Rock)
igneous
Magnetite (in matrix)
Magnetite (Fe3O4)
mineral
Snowflake Obsidian
Volcanic glass containing Cristobalite (SiO2)
igneous
Beryl (likely Pink/Morganite variety)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Granite Pegmatite
Coarse-grained Granite (SiO2 - Aluminum and Alkalies)
igneous
Diamond
C (Native Carbon)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Black Obsidian
Obsidian (Volcanic Glass, ~70% SiO2)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Red Quartz (Druzy)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Snowflake Obsidian
Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)
igneous
Pegmatite (with smoky quartz and tourmaline/biotite)
Pegmatitic Granite
igneous
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 with Au)
mineral
Tumbled Obsidian (possibly Mahogany Obsidian variant)
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Staining
Crystalline Silicon Dioxide (SiO2)
mineral
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral