Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
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Pyrite-bearing Rock
Iron Sulfide (FeS2) associated with host rock
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Shale
Shale (Lutite)
sedimentary
Malachite-Bearing Copper Ore
Cu2CO3(OH)2 (Malachite) in host rock
mineral
Basalt Pebble
Mafic Igneous Rock (Basalt)
igneous
Quartzite pebble
Quartzite (SiO2)
metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Shale (or Mudstone)
Clay mineral aggregate / Fine-grained siliciclastic sedimentary rock
sedimentary
Lava Rock (Basalt)
Basalt (extrusive igneous rock)
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Gabbro (River Cobble)
Gabbro (mafic intrusive rock)
igneous
Shale or Mudstone
Argillaceous sedimentary rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Shale
Lutaceous Rock (Hydrous Aluminum Silicates)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Topaz
Aluminum Silicate Fluoride Hydroxide - Al2SiO4(F,OH)2
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Green Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Red Jasper
Silicon dioxide (SiO2) with hematite impurities
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Heart-shaped Limestone
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Jasper
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Jasper (brecciated or orbicular variety)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate)
mineral
Pyrite (on Shale/Matrix)
Iron Disulfide (FeS2)
mineral
Concretion or Geode (unbroken)
Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.
Sedimentary rock (specifically a concretion or possibly a geode)
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone (River Cobble)
Sandstone (primarily composed of silica, SiO2)
sedimentary