Sandstone (lithic wake or graywacke)
Clastic sedimentary rock (primarily quartz and lithic fragments)
sedimentary
Category
Not A Rock (Synthetic Material)
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Jasper River Stone
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Vesicular Basalt (Lava Rock)
Vesicular Basalt (comprising plagioclase feldspar and pyroxene group minerals)
igneous
Sandstone
Sedimentary Rock (Quartz arenite or arkose)
sedimentary
Sandstone
Sandstone (SiO2 predominant)
sedimentary
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Porphyritic Basalt (or Porfido / Porphyry Beach Pebble)
Porphyritic Basalt / Andesite
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica or iron-oxide impurities
metamorphic
Fossil Coral
Rugose Coral / Hexagonaria (CaCO3)
fossil
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone Pebble (River Rock)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Quartzose)
Sandstone (Principally SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Sandstone
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Brecciated quartzite (likely iron-stained quartz vein material)
Quartzite; predominantly quartz (SiO₂), with dark iron/manganese-oxide or mica-rich seams
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Epidotite (Unakite-related)
Epidote-rich rock
metamorphic
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Weathered quartz-rich pebble, possibly granite or pegmatite
Quartz (SiO₂) with probable feldspar and minor mica/iron-oxide inclusions
igneous
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Quartz vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Lithic Matrix
metamorphic
Uncertain fine-grained rock or mineral-bearing specimen
Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains
mineral
Quartz-rich chalcedony (likely silicified rock)
Microcrystalline quartz, SiO₂; possibly silicified limestone or jasper
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Sandstone (likely Arkosic or Ferruginous)
Arenite (SiO2 with iron oxides or feldspar)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Uncertain pale green-gray mineral/rock fragment
Possibly serpentine-bearing rock or greenstone; exact identification requires testing
mineral
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Quartz vein in dark host rock
Quartz (SiO₂), likely in basalt, gabbro, or altered mafic rock
mineral
Milky quartz pendant
Quartz (silicon dioxide, SiO₂)
mineral
Rounded gray river pebble, likely basalt or andesite
Fine-grained mafic volcanic rock; commonly basalt (plagioclase, pyroxene, and possible olivine)
igneous
Dendritic jasper/chalcedony
Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites
mineral
Granitic rock, likely weathered granite
Granite; primarily quartz, feldspar, and mica
igneous
Red Sandstone
Arenite (Iron-rich)
sedimentary
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic