Organic Material (Likely A Fruit Or Berry)

Weathered serpentinite (likely serpentine-rich rock)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite and accessory minerals

Yellow Chalcedony (likely Carnelian or Yellow Agate)

Silicon Dioxide (SiO2)

Greywacke (River Pebble)

Greywacke sandstone with quartz veining

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Tumbled pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂), pink variety commonly called rose quartz

Quartz-rich metamorphic rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite composed predominantly of recrystallized quartz

Sandstone (likely Arkosic or Lithic Sandstone)

Clastic Sedimentary Rock (SiO2 with assorted minerals)

Sandstone (likely Greywacke or Lithic Sandstone)

Arenite / Wacke

Chert (specifically Yellow/Brown Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tumbled jade-like stone, likely nephrite jade

Nephrite: fine-grained interlocking tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

Quartz-rich vein rock, likely milky quartz in weathered host rock

Milky quartz (SiO₂), probably with weathered feldspar and iron-oxide staining

Weathered quartz-rich rock fragment

Indeterminate; possibly weathered granite, quartzite, or rhyolite

Petrified Wood

Silicified Wood (SiO2)

Tumbled jasper or iron-rich chalcedony

Microcrystalline quartz (SiO₂), likely colored by iron oxides

Translucent agate/chalcedony

Microcrystalline quartz (SiO₂), likely chalcedony with agate-like banding

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Fossilized Bone Fragment

Vertebrate Fossil Material (Apatite/Calcium Phosphate)

Tumbled brown jasper (likely iron-rich chalcedony)

Jasper, opaque microcrystalline quartz (SiO₂), commonly colored by iron oxides

Calcareous Tufa

Tufa (Calcium Carbonate, CaCO3)

Tumbled blue chalcedony (likely common blue quartz)

Microcrystalline quartz, SiO₂; chalcedony variety

Polished/tumbled jasper, likely ocean jasper or brecciated jasper

Jasper: microcrystalline quartz (SiO₂) with iron oxides and other silicate impurities

Tumbled green-brown stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite

Jasper (Red-Brown)

Silicon Dioxide (SiO2) with Iron Oxide impurities

Goldstone

Avventurina (Cu + SiO2 glass)

Metallic iron meteorite fragments (probable)

Iron meteorite, chiefly kamacite (α-(Fe,Ni)) with possible taenite

Iron-rich brown stone, possibly weathered chert or ironstone

Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)

Quartz geode

Microcrystalline and crystalline quartz (SiO₂), likely chalcedony-lined geode

Fine-grained dark igneous rock, likely basalt

Basalt; predominantly plagioclase feldspar and pyroxene, commonly with minor olivine and iron-titanium oxides

Tumbled dark gray stone, likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Brecciated jasper (likely red-and-cream jasper)

Jasper, an opaque microcrystalline variety of quartz; primarily cryptocrystalline SiO₂ with iron-oxide staining and possible chalcedony/quartz veining

Likely tumbled sandstone or limestone

Quartz-rich sandstone (possibly calcarenite/limestone)

Dark mafic rock, likely basalt

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Mica-rich schist, likely lepidolite or muscovite schist

Mica schist; predominantly muscovite KAl₂(AlSi₃O₁₀)(OH)₂, possibly lithium-rich lepidolite

Granite (likely weathered granitic rock)

Granitic rock, chiefly quartz + feldspar + mica (variable composition)

Petrified Wood

Silicified Wood (SiO2)

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Tumbled smoky quartz with iron-stained inclusions

Quartz (SiO₂), likely smoky quartz variety

Chert (varietal: Jasper or Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Bituminous Coal

Organic-rich sedimentary rock (Complex hydrocarbons)

Black Granite

Phaneritic Mafic Igneous Rock (likely Gabbronorite or Dolerite)

Jasper

Silicon dioxide (SiO2) with iron impurities

Likely tumbled calcite or pale limestone fragment

Calcite (CaCO₃), possibly microcrystalline limestone