Sandstone (Iron-stained)
Clastic sedimentary rock (SiO2 with Fe2O3 staining)
sedimentary
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
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Pink Quartzite
Quartzite (principally Silicon Dioxide, SiO2)
metamorphic
Jasper with Quartz Veining
Microcrystalline quartz (SiO2) with iron oxide impurities
sedimentary
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary
Honey calcite (calcite-rich limestone/marble fragment)
Calcite — CaCO₃; likely coarse crystalline calcitic rock
mineral
Granite Gravel / Crushed Granite
Plutonic Felsic Igneous Rock
igneous
Biotite-bearing granite or gneiss
Felsic granitoid; chiefly quartz, feldspar, and biotite mica
igneous
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Quartz Crystal Cluster
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary
Botryoidal Malachite
Malachite - Cu2CO3(OH)2
mineral
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Ironstone Concretion (Boxwork)
Siderite-Limonite Concretion (FeO(OH)·nH2O)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Quartz-rich rock, likely chert or chalcedony
Microcrystalline silica (SiO₂), possibly quartz/chalcedony
mineral
Amygdaloidal Basalt
Vesicular and Amygdaloidal Basalt
igneous
Granite
Phaneritic plutonic rock (SiO2 rich)
igneous
Limonite-stained Chert
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Feldspar-rich igneous rock, likely granite or gneiss fragment
Granite-like quartz–feldspar rock; exact identification is uncertain from the blurred image
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Diorite with Quartz contact
Intermediate Phaneritic Igneous Rock (Diorite)
igneous
Schist
Mica Schist
metamorphic
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
River Jasper (Chert/Chalcedony mix)
Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions
sedimentary
Red Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Opalite
Man-made Glass (Synthetic Opalized Glass)
gemstone
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)
sedimentary
Granite Cobble
Plutonic Igneous Rock (Granitic)
igneous
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartz-rich granitic rock, possibly pegmatite
Granite/pegmatitic granite; chiefly quartz (SiO₂), feldspar, and mica
igneous
Yellow calcite crystal cluster with calcite fragment
Calcite, calcium carbonate (CaCO₃)
mineral
Sandstone (Red)
Arenite (primarily Quartz, SiO2, with Iron Oxide cement)
sedimentary
Nuummite
Nuummite (ortho-amphibole rock)
metamorphic