Granite with Pyrite Inclusion
Granite (felsic intrusive igneous rock) with Iron Sulfide (FeS2)
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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Ironstone Concretion (Limonite/Goethite)
Goethite-rich Concretion (FeO(OH))
sedimentary
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Sandstone (with manganese staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Black obsidian
Volcanic glass, predominantly rhyolitic silica glass (approximately 70–80% SiO₂)
igneous
Black Obsidian and Hematite
Volcanic Glass (SiO2) and Hematite (Fe2O3)
igneous and mineral
Green Quartzite Pebble
Quartzite (SiO2 with chlorite/fuchsite inclusions)
metamorphic
Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Sandstone (Banded)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Jasper with Dendritic Inclusions
Microcrystalline Quartz (SiO2) with manganese or iron oxide inclusions
sedimentary
Quartzite Countertop
Quartzite (SiO2 dominated)
metamorphic
Trace Fossil (Lichenandites or Rhynie Chert Chert with Microfossils)
Trace fossil in microcrystalline quartz (SiO2)
fossil
Greenstone (Celadonite-bearing Volcanic)
Hydrothermally altered basalt or andesite with Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)
metamorphic
Snowflake Obsidian
Volcanic Glass with Spherulitic Cristobalite Inclusion
igneous
Nephrite Jade (or Serpentine)
Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals
Mineral/Rock
Snowflake Obsidian
Spherulitic Obsidian (contains Cristobalite inclusions)
igneous
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Obsidian
Volcanic Glass
igneous
Scoria (Lava Rock)
Scoria
igneous
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Obsidian
Volcanic glass
igneous
Ironstone Concretion
Siderite or Hematite-bonded Concretion
sedimentary
Obsidian
Volcanic glass
igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Ironstone Concretion / Limonite Node
Goethite and Limonite (FeO(OH) nH2O)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Mica Schist with Quartz
Schist containing Muscovite and Quartz
metamorphic
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Apache Tear (Obsidian)
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Bismuth Crystal
Bismuth (Bi)
mineral
Chert Concretion (with typical hematite/limonite staining)
Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)
sedimentary
Blue Apatite
Calcium Phosphate (Ca5(PO4)3(F,Cl,OH))
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Orange Quartz
Crystalline Silicon Dioxide (SiO2) with iron oxide inclusions
mineral