Basalt with Vesicular Amygdule
Extrusive igneous rock (Mafic)
igneous
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.
Learn about Mineral, Often A Rock Given Its Aggregate Nature in the encyclopedia
View all →
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Gold Nugget
Native Gold (Au)
mineral
Sandstone (Quartzite Pebble)
Arenite (primarily SiO2)
sedimentary
Iron-stained Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Jasper (Brown Iron-Rich Variety)
Silicon Dioxide (SiO2) with Fe2O3 (Iron Oxide/Crystalline Quartz)
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Banded Jasper (possibly "Picture Jasper")
Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)
Sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate)
Fluorite (likely Green Fluorite variant)
Calcium Fluoride (CaF2)
mineral
Native Silver Nugget
Silver (Ag)
mineral
Quartzite with vugs/druzy quartz
Crystalline Silicon Dioxide (SiO2)
metamorphic
Sandstone (Weathered / Crushed)
Quartz Sandstone
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Fluorite (Rainbow Fluorite Tower)
Fluorite (Calcium Fluoride, CaF2)
mineral
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
River Rock (Basalt or Sandstone)
Clastic Sedimentary Rock or Extrusive Mafic Igneous Rock
igneous or sedimentary
River Rock (Greywacke/Sandstone)
Lithic Wacke
sedimentary
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Ferruginous Sandstone
Sandstone with Iron Oxide (Limonite/Goethite)
sedimentary
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Black Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Likely gneiss (banded metamorphic rock)
Felsic-to-intermediate gneiss; exact mineral identification requires closer examination
metamorphic
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Sedimentary Pebble
Sedimentary Rock Fragment
sedimentary
Fossiliferous Limestone
Calcite-rich Fossiliferous Limestone (CaCO3)
sedimentary
Picture Jasper
SiO2
mineral
Faceted Citrine
Citrine Quartz (Silicon Dioxide, SiO2)
gemstone
Conglomerate
Conglomerate
Sedimentary
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Quartz Grains
Silicon Dioxide (SiO2)
mineral
Chalcedony (variations like Agate or Jasper)
Chalcedony (SiO₂ - microcrystalline quartz)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Dark igneous rock, likely basalt or diabase, with a second purplish specimen
Basalt/diabase; exact identification is uncertain from the photograph
igneous
Jasper and Aquamarine (likely)
Jasper (Cryptocrystalline Quartz (SiO2)), Aquamarine (Beryl (Be3Al2Si6O18))
Sedimentary (Jasper), Mineral (Aquamarine)
Chert
Microcrystalline quartz (SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral