Organic Material (Likely A Fruit Or Berry)

Limestone

Calcium carbonate (CaCO3)

Iridescent schist or phyllite

Micaceous quartz-rich schist/phyllite, likely containing muscovite or chlorite

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (often called Flint or Jasper locally)

Chert (Microcrystalline Quartz, Formula: SiO2)

Rounded basalt cobble

Basalt (fine-grained mafic volcanic rock)

Orbicular rhyolite (likely)

Rhyolite, a silica-rich volcanic rock; commonly quartz, alkali feldspar, plagioclase, and iron-rich alteration minerals

Chert (Commonly known as Flint)

Microcrystalline Quartz (SiO2)

Chert (and Limestone)

Silicon Dioxide (SiO2)

Brecciated jasper/chalcedony (iron-stained silica)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Likely black beach pebble

Undetermined; possibly basalt, chert, or dark slate

Conglomeratic breccia

Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix

Polished blue sodalite cabochons

Sodalite, Na₈Al₆Si₆O₂₄Cl₂

Chert (specifically Flint or Jasper variant)

Microcrystalline silica (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Ferro-silicate Slag

Industrial Vitrified Slag (High-silica amorphous glass)

Granite-like rock

Felsic intrusive igneous rock, likely granite or granodiorite

Chert (Flint)

Cryptocrystalline quartz (SiO2)

Chert (and Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Chert / Flint)

Silicon Dioxide (SiO2)

Chert / Flint Pebble

Silicon Dioxide (SiO2)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Sandstone (Ferruginous/Red Sandstone)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Chert (Jasper/Agate variety)

Microcrystalline quartz (SiO2)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tumbled citrine quartz (likely heat-treated amethyst)

Quartz, SiO₂; crystalline variety citrine

Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)

Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy

Chalcedony (likely common gray chalcedony)

Microcrystalline quartz, SiO₂

Porphyritic basalt (likely amygdaloidal basalt)

Basalt containing larger plagioclase crystals and pale vesicle-fill minerals, commonly calcite, zeolite, or quartz

Polished brecciated jasper (likely septarian or iron-rich jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments

Amber

Succinite (Fossilized Resin)

Chert (Quartz Variety)

Chert (Silicon Dioxide, SiO2)

Likely citrine pendant

Quartz, silicon dioxide (SiO₂), probably heat-treated amethyst or smoky quartz

Sandstone (likely Arkosic)

Clastic Sedimentary Rock (Sandstone)

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Rounded pink granite pebble

Granite, chiefly quartz, alkali feldspar, plagioclase, and minor biotite/hornblende

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica (possibly metamorphosed to gneiss)

Mica-rich granite (likely biotite granite)

Biotite granite; mainly quartz (SiO₂), alkali/feldspar, and biotite mica

Banded Agate (Dyed)

Silicon Dioxide (SiO2) with impurities

Amethyst geode

Quartz (SiO₂), purple variety amethyst; commonly in basalt-hosted geodes

Green aventurine quartzite (likely)

Quartz-rich metamorphic rock; predominantly microcrystalline quartz (SiO₂), with possible fuchsite, chlorite, or epidote

Chert (variously identified as Flint)

Microcrystalline Quartz (SiO2)