Rock (Likely Sedimentary)

Quartzite

Quartzite (SiO2)

Basalt with Phenocrysts (Porphyritic Basalt)

Porphyritic Basalt (primarily Plagioclase and Pyroxene)

Amber (Rough Baltics/Beach Specimen)

Succinicum (Organic Gemstone - Fossilized Resin)

Granite (Weathered)

Phaneritic Felsic Igneous Rock

Chert (Pink Jasper variant)

Microcrystalline Quartz (SiO2)

Gneiss (Granitic Gneiss)

Gneiss

Chert (Flint)

Microcrystalline Quartz (SiO2)

Iron-Stained Quartz (Riverside Cobble)

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)

Quartz Crystal

Quartz (SiO₂)

Quartz Crystal with Inclusions

Silicon Dioxide (SiO2)

Chalcedony with inclusions (Agate/Quartz)

Silicon Dioxide (SiO2)

Jasper (Banded Jasper)

Silicon Dioxide (SiO2) with impurities

Fossilized Shark Tooth (Otodus obliquus)

Otodus obliquus (composed primarily of Fluorapatite)

Chert (with Quartz/Chalcedony)

Microcrystalline Quartz (SiO2)

Granite

Granite (Phaneritic Acidic Igneous Rock)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Basalt with Epidote/Chlorite

Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))

Sandstone (Painted)

Arenite (primarily SiO2)

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (and Petrified Wood)

Silicon Dioxide (SiO2)

Diorite (River Pebble)

Diorite (Intermediate intrusive igneous rock)

Goldstone

Avventurina (Cu + SiO2 glass)

Pumice

Vesicular volcanic glass (Amorphous silica mixed with various oxides)

Pink Granite

Phaneritic Plutonic Felsic Rock (Granite)

Chert (specifically a nodule with Chalcendony/Agate banding)

Microcrystalline Quartz (SiO2)

Schist (Garnet-Mica Schist)

Garnetiferous Mica Schist (primarily Muscovite/Biotite and Almandine Garnet)

Chalcedony (Botryoidal or Geode form)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Quartz (specifically Clear Quartz with iron/hematite staining)

Silicon Dioxide (SiO2)

Quartzite with Hematite

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)

Granite Cobble

Granite (Phaneritic Quartz-Feldspar-Mica intrusive rock)

Amazonite

K(AlSi3O8) - Lead-bearing Microcline (Potassium Feldspar)

Fossilized Shark Tooth

Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Pink Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Chert (Heart-shaped Pebble)

Cryptocrystalline quartz (SiO2)

Sandstone with Quarzite clasts

Arenite (SiO2 based)