Conglomerate
Conglomerate rock
sedimentary
Category
Man Made (Synthetic Rock)
Browse man made (synthetic rock) specimens identified by the Rock Identifier community.
Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Basalt
Mafic extrusive volcanic rock (composed primarily of Plagioclase feldspar and Pyroxene)
igneous
Porphyry
Porphyritic Rock
igneous
Conglomerate
Conglomerate rock
sedimentary
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Shale
Argillaceous Rock
sedimentary
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Vesicular Basalt
Basalt with vesicular texture
igneous
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety
Mineral
Yellow Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Peridotite (Pyroxenite/Serpentinized Dunite)
Ultramafic Rock (consisting primarily of Olivine and Pyroxene)
igneous
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Puddingstone (Gowganda Tillite/Jasper Conglomerate)
Jasper Conglomerate (SiO2 primary composition)
sedimentary
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and Biotite)
igneous
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Glacial Cobble (likely Granitic or Gneissic)
Granite/Gneiss Glacial Erratic
igneous
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Quartz (Silicon Dioxide - SiO2) within a Chalcedony and Limonite shell
sedimentary
Limonite (after Pyrite Pseudomorph)
Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)
mineral
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Crushed Stone (Basalt/Gabbro)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)
igneous
Massive Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with Iron impurities
mineral
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Chert (Arrowhead)
Chert (primarily Microcrystalline Silica, SiO2)
sedimentary
Agate Geode with Quartz Druzy
Chalcedony (SiO2) and Quartz (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Metaconglomerate
Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic