Organic Material (Likely A Fruit Or Berry)

Mixed polished gemstone bead lot, likely dyed agate and quartz

Chalcedony (microcrystalline quartz, SiO₂), with possible amethyst, aventurine, and other dyed quartz varieties

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or iron-oxide impurities

Tumbled quartz-rich agate/geode fragment

Microcrystalline quartz (SiO₂), likely chalcedony with crystalline quartz and possible iron-oxide inclusions

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (Black Flint)

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Druzy quartz geode

Microcrystalline quartz (SiO₂), commonly lining a volcanic geode cavity

Coarse-grained mica-bearing metamorphic rock, likely schist

Mica schist, probably muscovite–biotite schist with quartz and feldspar

Chert (Jasper/Quartzite river stone)

Microcrystalline Silicon Dioxide (SiO2)

Limonite-stained Chert

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Tumbled gray-green pebble, likely chert or altered volcanic rock

Cryptocrystalline quartz (chert), possibly silicified volcanic material

Serpentine (likely serpentinized ultramafic rock)

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; commonly derived from peridotite

Yellow calcite crystal cluster with calcite fragment

Calcite, calcium carbonate (CaCO₃)

Mixed collection of natural stones

Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks

Yellow faceted gemstone earrings, likely citrine or yellow beryl

Citrine: quartz, SiO₂; possible yellow beryl: Be₃Al₂Si₆O₁₈

Tumbled dark stone, likely basalt or basaltic rock

Fine-grained mafic volcanic rock; commonly basalt, composed chiefly of plagioclase and pyroxene with possible olivine and iron oxides

Sandstone (likely Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Limestone ( weathered ) / Chert Nodular Rock

Sedimentary rock (primarily Calcium Carbonate, CaCO3, with Microcrystalline Quartz, SiO2)

Polished jasper (likely brecciated or iron-rich jasper)

Microcrystalline quartz (SiO₂), colored by iron oxides/hydroxides and possibly sulfide minerals

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Sunstone

Oligoclase (Plagioclase Feldspar Group) - (Ca, Na)(Al, Si)4O8

Chert (Yellow Chert/Flint)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Cryptocrystalline Quartz (SiO2)

Painted River Rock

Artificially Coated Sedimentary Rock

Tufa

Calcareous Tufa (Calcium Carbonate, CaCO3)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Common Chert)

Silicon Dioxide (SiO2)

Iron meteorite fragment (likely weathered meteorite)

Fe–Ni metal, commonly kamacite with taenite; possible stony-iron or iron-oxide fusion crust

Chert (specifically Flint or Jasperoid)

Silicon Dioxide (SiO2)

Tumbled white chalcedony (likely milky quartz)

Chalcedony, microcrystalline SiO₂; possibly milky quartz

Quartz-rich metamorphic rock, likely mica schist

Mica schist; chiefly quartz (SiO₂) with biotite/muscovite mica and possible feldspar

Polished blue stone, likely sodalite or dyed agate

Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing

Quartz geode (likely amethyst-bearing geode)

Microcrystalline quartz and drusy quartz; SiO₂, with possible iron-stained or amethyst quartz

Milky quartz (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Tumbled chalcedony (likely pale agate or quartz pebble)

Microcrystalline silica, SiO₂ (chalcedony; possibly quartz-rich agate)

Small rounded stone, likely basalt or weathered mafic rock

Fine-grained basalt; exact identification requires testing

Polished pink-and-gray stone, likely granite or quartzite

Indeterminate; probable quartz-rich granite, possibly pink quartzite

Weathered quartz-rich rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly iron-oxide stained

Ironstone Concretion

Siderite / Hematite-bearing Sedimentary Rock