Chert (specifically a weathered Chert nodule or fragment)
Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Man Made (Synthetic Rock)
Browse man made (synthetic rock) specimens identified by the Rock Identifier community.
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Jasper-Agate Conglomerate (Potentially Puddingstone)
Jasper-cemented Silicate Aggregate (SiO2)
sedimentary
Granite Cobble
Plutonic Granite
igneous
Red Jasper
Jasper (Silicate mineral - SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Ferruginous Sandstone (Gerrit)
Arenite with Iron Oxide cementation
sedimentary
Granitic Pegmatite
Granite Pegmatite (coarse-grained intrusive igneous rock)
igneous
Chert / Jasper
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Grey River Pebble (Likely Quartz-rich or Limestone)
Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Apache Tear
Obsidian (Hydrated Silica Rich Volcanic Glass)
igneous
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Apache Tear
Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)
igneous
Iron-stained Quartzite
Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)
metamorphic
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Hematite/Limonite) inclusions
mineral
Ironstone (likely siderite or goethite-rich siltstone)
Ferruginous Siltstone
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Geode (Unopened)
Silica-rich concretion (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron impurities
sedimentary
Scoria
Vesicular Basalt / Scoria
igneous
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite Pebble
Recrystallized Quartz (SiO2)
metamorphic
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Serpentine
Serpentine Group (primarily Antigorite or Lizardite), Mg3Si2O5(OH)4
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Limonite inclusions
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Stromatolite
Laminated biogenic sedimentary structure (formed by Cyanobacteria)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Schorl (Black Tourmaline) in Quartz or Feldspar Matrix
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl) in Granitic Pegmatite
igneous
Pumice
Pumice (extrusive volcanic rock)
igneous
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Granitoid (Granite/Gneiss)
Granitoid silicate rock, primarily quartz and feldspar
igneous/metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (with secondary mineral infilling)
igneous
Dalmatian Jasper
Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)
igneous
Granite
Felsic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (SiO2 principal)
sedimentary
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host