Small seashell fossil or shell fragment
Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate
fossil
Category
Sedimentary (Man Made)
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Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicate (SiO2 with Hematite impurities)
sedimentary
Chert (Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Diabase (also known as Dolerite)
Diabase / Dolerite
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Sandstone
Quartz Arenite (a type of sandstone composed of more than 90% quartz)
Sedimentary Rock
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Polished brown jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic
Magnetite or Hematite (Iron Stone)
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Obsidian
Obsidian (volcanic glass)
Igneous
Chert (Flint Nodules)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Iron-rich chert or jasper pebble
Microcrystalline quartz (SiO₂), colored by iron oxides
sedimentary
Red Jasper
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions
mineral
White Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Shale (possibly)
Shale (fine-grained clastic sedimentary rock)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Sand Dollar (Fossilized or Calcium Carbonate Skeleton)
Clypeasteroida (Order)
fossil
Pyrite
Iron Sulfide (FeS2)
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
sedimentary
Gneiss
Gneissic Metamorphic Rock
metamorphic
Chert (Flint Nodules)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper (Quartzite)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Tumbled pale quartz/chalcedony fragment
Quartz (SiO₂), possibly microcrystalline chalcedony
mineral
Jasper Agate
Chalcedony (Silicon Dioxide - SiO2)
mineral
Quartz (Chert/Chalcedony Variety)
Silicon Dioxide (SiO2)
mineral
Muscovite Schist
KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix
metamorphic
Sandstone
Arenite or Sandstone
Sedimentary Rock
Sandstone
Arenite (primarily SiO2 with trace Fe2O3)
sedimentary
Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Iron-rich flint or chert fragment
Microcrystalline quartz (SiO₂), likely ferruginous chert
sedimentary