Glacial Erratic (Graywacke/Sandstone)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Category
Anthropogenic Material
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Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Caliche (with Lichen Cover)
Calcium carbonate-cemented soil layer (CaCO3)
sedimentary
Quartz-rich metamorphic rock, likely milky quartzite
Quartzite; predominantly quartz (SiO₂), with minor mica, feldspar, and iron-oxide staining
metamorphic
Small quartz crystal cluster (likely druzy quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Diamond (in Jewelry)
Diamond (Carbon, C)
mineral
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite in Conglomerate
Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions
sedimentary
Chrysocolla-bearing copper ore
Chrysocolla, hydrated copper phyllosilicate (approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), likely mixed with malachite and/or turquoise
mineral
Pink chalcedony (rose quartz–like quartz)
Microcrystalline quartz, SiO₂; possibly quartz-rich rhyolite or jasper
mineral
Red Sandstone
Arenite (Iron-rich)
sedimentary
Serpentinite (or Green Quartz Pebble)
Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite
Granite
Igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Tumbled agate (probable moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron/manganese dendritic inclusions
mineral
Rough Diamond
Carbon (C)
gemstone
Slate
Metamorphic Pelitic Rock
metamorphic
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint) with Glauconite
Microcrystalline Quartz (SiO2)
sedimentary
Serpentinized ultramafic rock (probable serpentinite)
Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile/antigorite), with possible magnetite and carbonate
metamorphic
Ocean Jasper or Orbicular Jasper
SiO2
mineral
Sandstone (Calcareous)
Clastic sedimentary rock (primarily SiO2 with CaCO3 cement)
sedimentary
Unakite
Unakite (metamorphosed granitic rock)
metamorphic
Fossiliferous Sandstone with Plant Remains
Arenite with Carbonaceous impressions (likely Paleozoic/Mesozoic Flora)
sedimentary
Coarse-grained Granite
Granitoid (Felsic Plutonic Rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble with Chlorite or Epidote Inclusions
Silicon Dioxide (SiO2) with inclusions
metamorphic
Mica Schist
Schist
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Clastic Rock
sedimentary
Crinoid Stem Fossil
Crinoida (columnal ossicles)
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
mineral