Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Likely polished or naturally smoothed pebble with a pale mineral patch
Undetermined; possibly a dark volcanic rock with a quartz or feldspar inclusion
igneous
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Chert (Arrowhead)
Chert (SiO2)
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxides
sedimentary
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Green Obsidian Sphere (man-made glass)
Vitreous Silica with Chromium/Iron additives
mineralogical simulant
Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral (synthetic)
Sandstone (lithic/quartz variant)
Clastic sedimentary rock (SiO2 predominant)
sedimentary
Chert (Arrowhead/Projectile Point)
Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone Pebble
Arenite (Siliclastic sedimentary rock)
sedimentary
Iron-rich concretion or slag-like mineral fragment
Likely limonite/goethite (FeO(OH)·nH₂O), possibly magnetite-bearing material
mineral
Limestone with Iron Oxide Staining
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone
Arenite (Sandstone)
sedimentary
Black-and-white bicolored pebble
Likely basalt with a pale felsic or carbonate coating/inclusion; exact identification requires testing
igneous
Sea Glass
Anthropogenic Silicate Glass
mineral
Sandstone
Arenite
sedimentary
Sandstone (Red Sandstone)
Arenite
sedimentary
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)
metamorphic
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Silver Nuggets (Natural or Cast)
Native Silver (Ag)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock - Arenite
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Sandstone
Arenite (composed mainly of SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Basalt
Mafic Igneous Rock (Basalt)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (Iron-stained)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert Arrowhead (Lithic Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Iron-rich vesicular rock, possibly slag or weathered basalt
Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag
igneous
Asphalt (Bituminous Concrete)
Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)
not a rock (anthropogenic material/technofossil)
Sulfur
Native Sulfur (S)
mineral
Sulfur (with possible Cullet Glass or Slag imitation)
Native Sulfur (S8)
mineral