Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Category
Synthetic (Not A Rock Or Mineral)
Browse synthetic (not a rock or mineral) specimens identified by the Rock Identifier community.
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Amygdaloidal Basalt
Amygdaloidal Basalt
igneous
Porphyritic Basalt
Porphyritic Basalt with Plagioclase Phenocrysts
igneous
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)
sedimentary
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Note regarding image quality
Indeterminate
Granite
Felsic intrusive igneous rock
igneous
Chalcopyrite
Copper iron sulfide (CuFeS2)
mineral
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Veined Jasper
Microcrystalline quartz (SiO2) with calcium carbonate or quartz veins
sedimentary
Quartz with Schist Inclusion
Crystalline Silicon Dioxide (SiO2) with Muscovite/Biotite Schist
metamorphic
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Dendritic sandstone
Sandstone with Manganese Oxide dendrites
sedimentary
Agate
Silicon Dioxide (SiO2)
sedimentary
Sandstone with Quartz/Calcite druse
Arenite with druse (SiO2 or CaCO3)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Quartz Geode
Crystalline Quartz (SiO2) within a sedimentary/igneous host
mineral
Granite fragment
Granite (Felsic intrusive igneous rock)
igneous
Granite
Felsic intrusive igneous rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Calcite (Yellow/Orange variety - sometimes called Honey Calcite)
Calcite
Mineral
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Sandstone (Banded)
Sedimentary Clastic Rock
sedimentary
Gneiss Pebble
Gneiss
metamorphic
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Greenstone
Hydrothermal Quartz (SiO2) with Chlorite/Epidote Schist host rock
metamorphic
Quartz in Basalt (Xenocryst)
Silicon Dioxide (SiO2) in Mafic Igneous Volcanic Rock
Igneous
Bauxite
Hydrated aluminum oxides (mixture of gibbsite, boehmite, and diaspore)
sedimentary
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Blue Apatite
Fluorapatite / Apatite group (Ca5(PO4)3(F,Cl,OH))
mineral
Quartz Vein in Schist
Quartz (SiO2) in Mica Schist
metamorphic
Banded Slate
Slate (Metamorphosed Siltstone/Mudstone)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or volcanic shell
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Green Slate or Metamorphic Rock with Moss/Lichen
Metamorphic rock / Phyllite or Slate variant
metamorphic
Black Obsidian
Volcanic glass
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary