Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Category
Mineraloid (Human Made Geological Specimen)
Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.
Chalcedony (Banded/Mottled Variety)
Chalcedony (a cryptocrystalline variety of Quartz, SiO2)
Mineral
Pink Granite (Crystalline Granite)
Igneous Intrusive Rock (Felsic Plutonic)
igneous
Ferruginous Quartz
Iron-stained Quartz (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
mineral
Sandstone Concretion
Septarian or Carbonate-cemented Sandstone Concretion
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Granite Cobble
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Ferromanganese Nodule
Polymetallic Nodule (composed primarily of MnO2 and Fe2O3)
sedimentary
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Granitic Pegmatite with Schorl Tourmaline
Granitic Pegmatite (Schorl: NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Quartz (Milky/Gold-stained)
Silicon Dioxide (SiO2)
mineral
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
K2 Jasper (K2 Granite)
Azurite in Granite (Al2Cu3(CO3)2(OH)2 in NaAlSi3O8)
igneous
Titanium Coated Kyanite (Aura Kyanite)
Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating
metamorphic
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Chert Breccia (Yellow Jasper)
Silicon Dioxide (SiO2) - Brecciated Chert
sedimentary
Chert (specifically Jasper/Carnelian Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Sandstone with Ironstone Banding
Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)
sedimentary
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Banded Calcite (often sold as 'Mexican Onyx')
Calcite (Calcium Carbonate - CaCO3)
sedimentary
Smoky Quartz
Smoky Quartz (SiO ₂)
Mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Yellow Quartz (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Limonite and Goethite on Gossan
FeO(OH)·nH2O
mineral
Titanium-Coated Hematite (Aura Hematite)
Titanium-bonded Hematite (Fe2O3 with a Ti coating)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Limonite
Limonite (Hydrous iron oxides, FeO(OH)·nH2O)
mineral
Silver (Jewelry Specimen)
Native Silver (Chemical Formula: Ag)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Basalt (with possible iron oxide staining)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Milky Quartz (river pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Grey Limestone Pebble
Limestone (Calcium Carbonate - CaCO3)
sedimentary