Quartz pebble
Silicon dioxide (SiO2)
mineral
Category
Igneous, Sedimentary, Metamorphic, Mineral, Gemstone, Fossil, Or Meteorite
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Tumbled green aventurine
Quartzite dominated by quartz (SiO₂), commonly containing fuchsite mica or chlorite
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Fossiliferous limestone, possibly coral-bearing
Calcitic limestone (mostly CaCO₃; fossil fragments may include ancient colonial coral or shell material)
sedimentary
Olivine (Peridot)
Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Small tumbled quartz-like pebble
Likely quartz (SiO₂), possibly iron-stained chalcedony or feldspar
mineral
Tektite (Indochinite)
Tektite (SiO2 + Al2O3, Glassy Melts)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Fossilized shell fragment
Indeterminate fossil mollusk; likely a silicified or mineral-replaced bivalve/gastropod fragment
fossil
Quartz (Peach/Orange variety)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartz (Milky or Rough Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Likely metallic mineral specimens
Probably native iron or iron oxide/hydroxide material; exact identification requires testing
mineral
Quartz (Grain/Fragment)
Silicon Dioxide (SiO2)
mineral
Slate
Slate; predominantly fine-grained phyllosilicates (muscovite/illite, chlorite) with quartz and feldspar
metamorphic
Olivine (Peridot when gem-quality)
Magnesium Iron Silicate, (Mg,Fe)2SiO4
Mineral
Blue Quartz
Silicon Dioxide (SiO2) with microscopic inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (specifically Clear Quartz or Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Tektite (Indochinite)
Natural glass (High-silica impact glass)
mineral
Tumbled Moonstone
Feldspar (Orthoclase/Albite), KAlSi3O8
mineral
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Banded gneiss (possibly migmatitic gneiss)
Quartz–feldspar–mica gneiss; composition commonly includes quartz, feldspar, biotite/hornblende, and accessory dark minerals
metamorphic
Tumbled amethyst
Amethyst, purple variety of quartz (SiO₂)
mineral
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Labradorite
(Ca,Na)(Al,Si)4O8
mineral
Raw garnet-rich metamorphic rock
Likely garnet-bearing schist or garnetite; garnet-group silicates, commonly almandine (Fe₃Al₂Si₃O₁₂)
metamorphic
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Feldspar
Aluminosilicate (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Polished gray marble slab
Calcite-rich marble (recrystallized limestone; chiefly CaCO₃)
metamorphic