Fulgurite
Lechatelierite (vitreous silica)
mineral
Category
Not A Rock Or Mineral (Anthropogenic Material)
Browse not a rock or mineral (anthropogenic material) specimens identified by the Rock Identifier community.
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Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Rounded quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Schist
Mica schist, likely muscovite–biotite schist with quartz and feldspar
metamorphic
Likely basalt pebble
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine
igneous
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Unidentified small stone fragments
Indeterminate; the image does not show enough detail to identify a mineral or rock species
mineral
Rounded river pebbles (mixed lithologies)
Water-worn clasts; individual stones cannot be identified precisely from the image
sedimentary
Sandstone
Arenite
sedimentary
Likely weathered mica schist fragment
Mica schist, chiefly muscovite/biotite mica with quartz and feldspar
metamorphic
Likely biotite-bearing schist or gneiss
Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica
metamorphic
Amygdaloidal Basalt with Zeolite/Quartz Infill
Amygdaloidal Basalt (Host: (Mg,Fe)2SiO4 / CaAl2Si2O8; Infill: SiO2 or Na2Al2Si3O10·2H2O)
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Sandstone (SiO2 dominant, with minor feldspar and clay minerals)
sedimentary
Sandstone
Sandstone (SiO2-rich detrital sedimentary rock)
sedimentary
Sandstone (likely Arkose or Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Blue-green turquoise (probable)
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Iron-rich weathered rock, possibly ironstone
Ironstone (composition uncertain; likely iron oxides such as goethite and limonite)
sedimentary
Sandstone (with vugs)
Arenite / Sedimentary Sandstone
sedimentary
Quartz Veined Mudstone
Metasedimentary rock with Quartz (SiO2) veins
metamorphic
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Polished brecciated jasper pendant
Silica-rich jasper (microcrystalline quartz, SiO₂), brecciated and cemented by silica or iron-rich material
sedimentary
Blue-green botryoidal mineral specimen, likely chrysocolla or chrysocolla-bearing quartz
Chrysocolla (hydrated copper phyllosilicate; variable composition, commonly approximated as (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O)
mineral
Quartz with Pyrite and Lichen
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Unidentified brown rock fragment
Indeterminate from image; likely a weathered iron-rich lithic fragment
igneous, sedimentary, metamorphic, mineral, gemstone, fossil, or meteorite
Chert
Silicon dioxide (SiO2)
Sedimentary
Drupa or Druzy Quartz on Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Lithic Arenite)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based sedimentary rock)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Quartz-veined metamorphic rock, likely quartzite or schist
Quartz-rich metamorphic rock with a milky-quartz vein; exact host rock is indeterminate from the photo
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (often composed of Quartz, SiO2)
sedimentary