Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Vein in Siltstone
Siltstone with Quartz (SiO2) inclusion
sedimentary
Granite
Phaneritic Igneous Rock (Granite)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Chert (and Petrified Wood)
Silicon Dioxide (SiO2)
sedimentary
Granite Pebble
Granite (Phaneritic Igneous Rock)
igneous
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Basalt
Mafic Volcanic Rock (composed of plagioclase, pyroxene, and olivine)
igneous
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Tumbled Stone
Silicon dioxide / Various silicates
mineral
Hypersthene
Hypersthene ((Mg,Fe)SiO₃)
Mineral
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Sandstone (with Siltstone/Greywacke variations)
Sedimentary Rock (Clastic)
sedimentary
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Likely black beach pebble
Undetermined; possibly basalt, chert, or dark slate
sedimentary
Yellow Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Basalt or Siltstone Pebbles
Mafic volcanic rock (Basalt) or Indurated Siltstone
igneous or sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz / Quartzite Pebble
Silicon Dioxide (SiO2)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jade (likely Nephrite)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Sandstone (Quartz-rich)
Arenite (composed primarily of SiO2)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Fossiliferous Limestone
Calcite (CaCO3) Rich Bio-sedimentary Rock
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Weathered quartz-rich rock, likely milky quartz/quartzite
Quartz (SiO₂), possibly quartzite with minor iron-oxide staining
metamorphic
Granodiorite (Gneissic Pebble)
Granodiorite displaying minor foliation
igneous/metamorphic
Likely weathered iron-rich rock
Probable basalt or limonite/goethite-stained mafic rock; exact identification requires testing
igneous
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
fossil
Granite-like igneous rock
Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate
igneous
Small gray rock fragment, likely granite or diorite
Uncertain; probable coarse-grained silicate rock dominated by feldspar and quartz, possibly biotite/hornblende
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon dioxide (SiO2)
mineral
Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Botryoidal quartz (likely chalcedony or druzy quartz)
Silicon dioxide, SiO₂; microcrystalline quartz (chalcedony) with possible drusy quartz coating
mineral
Quartz (Gray/Smoky Varieties)
Silicon Dioxide (SiO2)
mineral
Coquina
Biogenic Limestone (Calcite, CaCO3)
sedimentary