River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Unakite
Epidotized Granite
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Clear Quartz Cluster
Quartz (Silicon Dioxide - SiO2)
mineral
Chert (and Flint variant)
Chert (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt (primarily SiO2, MgO, FeO, and CaO)
Igneous
Porphyritic Basalt
Amygdaloidal Porphyritic Basalt
igneous
Porphyritic Andesite
Andesite
igneous
Copper Ore with Chrysocolla and Azurite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / Cu3(CO3)2(OH)2 (Azurite)
mineral
Quartz Geode (with Agate banding)
Silicon Dioxide (SiO2)
Sedimentary or Igneous (secondary formation)
Ammonite Fossil
Ammonoidea (subclass)
sedimentary
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Graphite Schist
C (Carbonaceous Schist)
metamorphic
Sandstone
Arenite
sedimentary
Wonderstone (Sandstone)
Liesegang Banded Sandstone (SiO2 dominated)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Agate
Agate (Cryptocrystalline Variety of Quartz, SiO2)
Mineral
Quartzite Pebble (River Rock)
Quartzite (mainly SiO2)
metamorphic
Jadeite Jade
Jadeite (Sodium Aluminum Silicate, NaAlSi₂O₆)
metamorphic
Serpentinite (River Pebble)
Serpentinite (complex of Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Sandstone (Red Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)
sedimentary
Sandstone (likely Iron-rich or Arkosic)
Arenite (SiO2 with FeO(OH) or Fe2O3 staining)
sedimentary
Crinoid Stem Columns (Fossil)
Crinoidea (Class); often composed of the mineral Calcite (CaCO3)
sedimentary
Conglomerate (or Breccia)
Clastic Sedimentary Rock (Conglomeratic)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Quartzite (River Pebble)
Quartzite (primarily SiO2 with Dumortierite or Crocidolite inclusions)
metamorphic
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)
sedimentary
Basalt (Crushed Stone Aggregate)
Mafic Volcanic Basalt (Major Minerals: Plagioclase Feldspar, Pyroxene, Olivine)
igneous
Fluorite
Fluorite (CaF₂)
mineral
Raw Emerald in Schist Matrix
Beryl (Be3Al2Si6O18) in Mica Schist
Mineral in Metamorphic Rock
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Sand (Construction Grade)
Unconsolidated siliciclastic sediment (primarily SiO2)
sedimentary
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
metamorphic