Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Category
Rock
Browse rock specimens identified by the Rock Identifier community.
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Greywacke (River Pebble with Quartz Veins)
Greywacke (Indurated Sandstone); Veins: SiO2 (Quartz)
sedimentary
Quartz (Druzy) in host rock
SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)
Mineral
Basalt with Quartz/Calcite Veins
Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)
igneous
Quartzite River Pebble
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Ferruginous Sandstone (Ironstone)
Sandstone with Hematite/Goethite cement (SiO2 + FeO(OH))
sedimentary
Schist
Mica Schist (contains muscovite/biotite and quartz)
metamorphic
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Black Limestone with Calcite Veining
Bituminous Limestone (CaCO3 with Organic Carbon inclusions)
sedimentary
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
mineral
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Unakite
Epidotized Granite
metamorphic
Shale
Shale (Lutite)
sedimentary
Pink Quartzite
Quartzite (SiO2 with minor iron oxide impurities)
metamorphic
Vesicular Basalt (or Scoria)
Vesicular Basalt (Aphanitic-vesicular volcanic rock)
igneous
Conglomerate
Conglomerate rock
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Chert / Chalcedony (likely carnelian or flint variety)
Silicon Dioxide (SiO2)
sedimentary
Not a geological specimen
N/A (man-made object)
N/A
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Shale
Argillaceous Rock
sedimentary
Porphyry
Porphyritic Rock
igneous
Conglomerate
Conglomerate rock
sedimentary
Vesicular Basalt
Basalt with vesicular texture
igneous
Unidentifiable Rock Fragment
Uncertain
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety
Mineral
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
Yellow Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Peridotite (Pyroxenite/Serpentinized Dunite)
Ultramafic Rock (consisting primarily of Olivine and Pyroxene)
igneous
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Puddingstone (Gowganda Tillite/Jasper Conglomerate)
Jasper Conglomerate (SiO2 primary composition)
sedimentary
Glacial Cobble (likely Granitic or Gneissic)
Granite/Gneiss Glacial Erratic
igneous
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic