Sandstone
Arenite (SiO2 based)
sedimentary
Category
Mineral, Specifically A Rock Fragment
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Sandstone (with potential Concretion or Fossil fragment)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone (Greywacke/Siltstone variant)
Arenite / Wacke (SiO2 with diverse mineral inclusions)
sedimentary
Sandstone (Pebble)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Likely gray granite or gneiss fragment
Granite: quartz, feldspar, and mica; possibly banded gneiss if foliation is present
igneous
Greenschist
Chlorite schist (Metamorphic rock dominated by chlorite, epidote, and actinolite)
metamorphic
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Eclogite
Eclogite
metamorphic
Likely biotite-rich schist or gneiss
Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica
metamorphic
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Shale
Argillite / Shale
sedimentary
Asphalt Chunk
Asphalt concrete
man-made composite
Sandstone
Clastic Sedimentary Rock
sedimentary
Pink Granite
Granite (Phaneritic Acidic Igneous)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Brown Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz (Milky or Smoky)
Silicon Dioxide (SiO2)
mineral
Quartz-rich rock fragment
Microcrystalline quartz (SiO₂), possibly chalcedony or quartz-bearing breccia
mineral
Sandstone Pebble
Sandstone (primarily SiO2)
sedimentary
Mica Schist
Schist (primarily muscovite and quartz)
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Tree Agate
Chalcedony with Dendritic Chlorite (SiO2 with impurities)
sedimentary/mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Agate (specifically Botswana or Lake Superior style chalcedony)
Silicon Dioxide (SiO2)
mineral
Fossilized tooth, likely a mammalian tooth fragment
Indeterminate fossil tooth; possibly an ungulate or carnivoran tooth
fossil
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Glacial Cobble with Granite Inclusion
Porphyritic Basalt or Andesite containing Granitic Xenolith
igneous
Red Sandstone Pebble
Quartzose Sandstone
sedimentary
Polished brecciated jasper (likely)
Microcrystalline quartz, SiO₂, with iron-oxide-rich brown fragments and pale silica
mineral
Botryoidal chalcedony/geode fragment
Chalcedony, microcrystalline quartz (SiO₂), likely iron-oxide coated
mineral