Quartz–mica metamorphic rock, likely schist
Quartz–muscovite/biotite schist; predominantly SiO₂ quartz with phyllosilicate micas
metamorphic
Category
Man Made Material (Metal)
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Weathered granite or granitic gneiss fragment
Coarse quartz–feldspar–mica aggregate; possibly weakly foliated gneiss
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often referred to as Flint or Jasper when pigmented)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Mixed tumbled gemstone collection
Varied minerals, likely including amethyst, sodalite/lapis lazuli, quartzite or aventurine, jasper, and agate/chalcedony
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Graphite
Graphite (Carbon, C)
mineral
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Shark Tooth (Partial) or Coprolite
Elasmobranchii (fossil) or Coprolite (trace fossil)
fossil
Chondrite Meteorite
Ordinary Chondrite (L, LL, or H type)
meteorite
Brown Quartz (Jasper or Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert
Chert (SiO2)
sedimentary
Granodiorite (River Pebble)
Granodiorite
igneous
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Polished Picasso jasper
Silicified carbonate rock, commonly marketed as Picasso jasper; composition varies and is not a single mineral species
metamorphic
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Tumbled amethyst
Quartz, crystalline silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
gemstone
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Cinnabar in Quartz
Silicon Dioxide (SiO2) with Mercury Sulfide (HgS) inclusions
Mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Glacial Quartzite Cobble
Meta-orthoquartzite (SiO2)
metamorphic
Conical fossil shell or shell fragment
Likely a gastropod shell fragment; exact taxon indeterminate from the image
fossil
Granite
Intrusive Igneous Rock
igneous
Bismuth
Bismuth (Bi)
Mineral
Weathered sandstone fragment
Sandstone, primarily quartz (SiO₂) with feldspar and iron-oxide cement
sedimentary
Amber (Green variation)
Succinite
fossil
Milky Quartz with Chlorite/Amphibite Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Tumbled dark green stone, likely serpentine or greenstone
Serpentinite (hydrated magnesium silicate minerals, chiefly antigorite/lizardite); possible chlorite-rich greenstone
metamorphic
Limestone with Calcite Crust
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary
Limestone (Weathered Aggregate)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary