Pyrite
Iron Disulfide (FeS2)
mineral
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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Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)
Mineral (variety of Quartz)
Snowflake Obsidian
Hydrated Volcanic Glass with Cristobalite inclusions
igneous
Ironstone Concretion
Siderite or Goethite Concretion
sedimentary
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Ironstone Concretion (Boxwork)
Siderite-Limonite Concretion (FeO(OH)·nH2O)
sedimentary
Sandstone Chert Concretion
Silica-cemented Concretion (primarily SiO2)
sedimentary
Iron Nodule
Iron-manganese concretion (Fe-Mn hydroxide)
sedimentary
Obsidian
Obsidian (Volcanic Glass, SiO2 > 70%)
igneous
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Concretion with Geode Cavity
Ferruginous Sandstone Concretion with Quartz Center
sedimentary
Obsidian
Volcanic glass (high silica content based on SiO2)
igneous
Pumice
Vesicular Rhyolite or Dacite
igneous
Obsidian
Volcanic glass (Amorphous silicon dioxide)
igneous
Obsidian
Volcanic glass
igneous
Green Quartz (Aventurine or Green Quartzite)
SiO2 (Silicon Dioxide) with mica inclusions
metamorphic
Green Calcite (Onyx Marble)
Carbonate mineral (Calcium Carbonate, CaCO3)
sedimentary
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Flower Agate
Chalcedony with Opaque Spherulitic Inclusions (SiO2)
Mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Obsidian
Obsidian (Volcanic Glass), primarily SiO2
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Weathered metallic sulfide-bearing rock, possibly chalcopyrite ore
Likely chalcopyrite (CuFeS₂) in a weathered host rock; identification is uncertain from the photograph
mineral
Dendritic Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Orange Calcite (Banded Calcite)
Calcite (Calcium Carbonate, CaCO3)
mineral
Vesicular Basalt with Epidote/Amygdaloidal Basalt
Amygdaloidal Basalt (Mg, Fe)2SiO4 + Ca2(Al, Fe)3(SiO4)3(OH)
igneous
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Diorite
Phaneritic intermediate plutonic rock
igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Snowflake Obsidian (Flower Jasper variant)
Vitreous volcanic silicate with cristobalite inclusions
igneous
Ironstone Concretion / Goethite-Hematite Nodule
Goethite/Hematite (α-FeO(OH) / Fe2O3)
sedimentary
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Sandstone Concretion
Sedimentary Concretion (Quartz sandstone with iron oxide cement)
sedimentary
Quartz Pebble (Sea Glass-like Quartz)
Quartz (Silicon Dioxide - SiO2)
mineral