Xenolith in Basalt
Mafic Igneous Rock with Felsic Inclusion
igneous
Category
Mineral Within Sedimentary Rock
Browse mineral within sedimentary rock specimens identified by the Rock Identifier community.
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Hag Stone
Perforated Quartz / Sedimentary Rock
sedimentary
Iron-Oxide Concretion (Moqui Marble)
Goethite/Hematite Concretion (Fe2O3 / FeO(OH))
sedimentary
Conglomerate
Conglomerate rock (detrital sedimentary)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Banded Iron Formation (BIF) / Banded Sandstone Nodule
Hematite-rich Sandstone / Ferruginous Chert
sedimentary
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Conglomerate with Quartz Inclusions
Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)
sedimentary
Dalmation Stone
Peralkaline Rock (Microcline Quartz mixture with Arfvedsonite)
igneous
Limonite-stained Chert
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Red Aventurine
Aventurine Quartz (SiO2 + Hematite/Goethite)
metamorphic
Chert / River Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Ironstone (Limonitic Concretion)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions
sedimentary
Jasper and Basalt (Lake Superior Agate or Jasper Pebble)
Silicified rock / Cryptocrystalline quartz (SiO2) with basalt matrix
sedimentary
K2 Jasper (K2 Granite)
Azurite in Granite (Biotite Granite with Azurite inclusions)
igneous
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Ammonite Fossil in Matrix
Ammonoidea subclass (e.g., Arietites or similar genera)
fossil
Mica Schist
Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)
metamorphic
Quartz-veined Siltstone/Greywacke
Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)
sedimentary
Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
mineral
Shale
Shale (clastic sedimentary rock)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Common Opal/Agatized Rock)
Microcrystalline Quartz (SiO2) with potential Chalcedony/Opaline silica
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Chert / Chalcedony (likely carnelian or flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Ironstone (Limonite/Hematite)
Ferruginous Sedimentary Rock (composed largely of Fe2O3 and FeO(OH)·nH2O)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode or Druzy Quartz in Host Rock
Silicon Dioxide (SiO2)
mineral
Quartzite Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Tumbled fossiliferous limestone (likely fossiliferous marble)
Fossiliferous limestone, composed mainly of calcite (CaCO₃); the pale circular fossils appear to be shell or crinoid fragments
sedimentary
Chert (Nodule)
Chert (composition: SiO2)
sedimentary
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Jasper Chert Nodules
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Brachiopod Fossil in Sedimentary Rock
Phylum Brachiopoda fossil imprint in sedimentary matrix
fossil