Small rounded quartz pebble
Quartz (SiO₂), likely milky or iron-stained quartz
mineral
Category
Man Made Object (Metalwork)
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Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Feldspar (specifically Orthoclase or Plagioclase)
Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Small Pebble)
Silicon Dioxide (SiO2)
mineral
Chert (Basanite / Jasperoid)
Microcrystalline Quartz (SiO2)
sedimentary
Citrine Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Chert / Flint
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Fossilized Coral (Petoskey Stone or Rugose Coral)
Antophyllum (Hexagonaria) or Scleractinia (CaCO3)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Blue Dragon/Gray Chalcedony)
Silicon Dioxide (SiO₂)
mineral
Pumice
Pumice (Amorphous volcanic glass)
igneous
Jasper (specifically Yellow Jasper and Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite/Hematite-Chert)
sedimentary
Chert (specifically Flint or Common Chert)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Native Gold (in Jewelry)
Gold (Au)
mineral
Limestone
Sedimentary rock composed mainly of calcium carbonate (CaCO3)
sedimentary
Costume Jewelry Gemstones (Emerald-imitation and semi-precious beads)
BeCuAl6Si6O18 (Beryl structure), frequently simulated by glass or synthetic spinel
mineral
Quartz-rich pegmatite (likely feldspar–quartz rock)
Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining
igneous
Vesicular Basalt
Basalt (Mafic volcanic rock)
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pumice
Pumice (Felsic volcanic rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Greywacke
Dirty Sandstone (Lithic wacke)
sedimentary
Pumice
Pumice (a highly vesicular extrusive igneous rock, primarily amorphous silica)
igneous
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Tumbled lepidolite-rich pegmatite (probable)
Lepidolite, K(Li,Al)3(Si,Al)4O10(F,OH)2, in a granitic pegmatite matrix
mineral
Basalt (River Rock pebble)
Basalt (a mafic extrusive igneous rock)
igneous