Sedimentary Or Metamorphic (Base Substrate)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Common Gravel / Pebble

Lithified rock fragment / Detrital sediment

Sandstone

Arenite (SiO2 based)

Garnet Schist

Almandine-Garnet Mica Schist

Fossilized Shark Tooth

Eocene Lamniformes (Mackerel Shark clade)

Quartzite

Metamorphic Quartzite (SiO2)

Greenschist (or Serpentinite) with Quartz-Feldspar Vein

Metabasalt / Greenschist Facies Rock

Painted River Rock

Anthropogenic-modified Siliciclastic Sedimentary Rock

Granitoid (Granite/Gneiss mix)

Granite or Granitic Gneiss (Silicon dioxide SiO2 with Al, K, Na silicates)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or iron-oxide impurities

Quartzite Cobble (Iron-stained)

Quartzite (SiO2)

Sandstone / Chert Gravel

SiO2 (Silicon Dioxide based clastic sedimentary rock)

Fuchsite Schist with Quartz

Chromian Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2] Schist

Epidote

Ca2(Al, Fe)3(SiO4)3(OH)

Biotite mica schist (probable)

Mica schist, dominated by biotite; approximate mica formula K(Mg,Fe)₃AlSi₃O₁₀(OH)₂

Magnesite or Howlite (dyed or naturally patterned)

Magnesium carbonate (MgCO3) or Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Fuchsite

K(Al,Cr)2(AlSi3)O10(OH)2

Basalt Pebble

Extrusive Igneous Rock

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

River Pebble

Weathered Rock Fragment

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)

Quartzite

Metamorphic Quartzite (SiO2)

Sandstone

Arenite (SiO2 based)

Biotite

K(Mg,Fe)_3AlSi_3O_10(OH,F)_2

Biotite Mica (or Tourmaline fragment)

K(Mg,Fe)3AlSi3O10(F,OH)2

Mixed pebble collection, including likely flint, quartzite, and fossil material

Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil

Venetian Gold Granite

Phaneritic Felsic Igneous Rock (Granite)

Jasper Veined Greenstone

Metamorphosed mafic volcanic rock with quartz-jasper vein

Quartzite with Calcite Accretion

Metamorphosed Quartz Sandstone (SiO2 with CaCO3 coating)

Topaz

Al2SiO4(F,OH)2

Mixed polished river stones

Likely quartz, quartzite, chert/jasper, and possibly limestone or marble

Conglomerate

Clastic Sedimentary Rock

Jasper

Jasper (Silicon Dioxide, SiO2)

Labradorite

Plagioclase Feldspar ((Na,Ca)(Al,Si)4O8)

Labradorite

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Mica flakes (Muscovite)

Muscovite mica (KAl2(AlSi3O10)(F,OH)2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Pearl-bearing oyster shell

Nacreous shell, primarily aragonite (CaCO₃), with natural pearls (calcium-carbonate nacre)