Organic Material (Likely A Fruit Or Berry)

Chalcedony (Botryoidal/Agate nodule)

Microcrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz / Iron-Stained Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions/staining

Quartzite Cobble

Quartzite (composed primarily of SiO2)

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Natural Pearl (appearing in a jewelry setting)

Calcium Carbonate (mostly Aragonite), CaCO3 with Conchiolin

Mica Schist with Iron Staining

Muscovite/Biotite Schist

Sandstone (Green/Yellow Siltstone variant)

Arenite or Siltstone (primarily SiO2 with mineral staining)

Dyed Pink Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Milky Quartz with inclusions

Quartz (Silicon Dioxide, SiO2)

Pegmatite (Granitic) with Tourmaline

Granitic Pegmatite (containing Schorl and Quartz)

Quartzite

Quartzite (SiO2)

Quartzite (or Ferruginous Quartzite)

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 impurities)

Oolitic Limestone (Oolite)

Oolitic Limestone (primarily Calcium Carbonate, CaCO3)

Botryoidal Hematite (Kidney Ore)

Hematite (Fe2O3)

Basalt with Iron Oxidation

Amygdaloidal Basalt (silicate rock primarily plagioclase, pyroxene, and olivine)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Granite (specifically Pink Granite)

Phaneritic Plutonic Rock (High Potassium Feldspar Granite)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Coal (Bituminous or Anthracite)

Carbonaceous sedimentary rock (primarily Carbon, C)

Amber

Succinite (fossilized resin)

Jasper

Jasper (Silica/Silicon Dioxide, SiO2)

Milky Quartz with Chlorite/Mica inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

Agate (Polished Slice)

Banded Chalcedony (SiO2)

Amazonite

Microcline (variety Amazonite), K(AlSi3O8)

Amazonite

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

Granite

Granite (Felsic Plutonic Rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Lake Superior Agate variant)

Microcrystalline Quartz (SiO2)

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

Pumice

Vesicular volcanic glass (primarily SiO2 with Al2O3)

Mica Schist

Mica Schist (Complex Silicate Rock)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Fossilized Gastropod in Chert/Limestone

Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula

Feldspar-rich Quartzite

Feldspathic Quartzite (Metamorphosed Sandstone)

Quartzite (River Pebble)

Metamorphic Quartzite (SiO2)

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Gold Nugget

Native Gold (Au)