All rocks & minerals

Jasper and Chalcedony

Silicon Dioxide (SiO2) microcrystalline quartz

Sandstone

Sedimentary Rock (Quartz Sandstone)

Dyed Agate

Silicon dioxide (SiO2)

Green Aventurine

SiO2

Carnelian

Silicon Dioxide (Quartz variety), SiO2

Petoskey Stone / Rugose Coral Fossil

Hexagonaria percarinata

Pyrite

Iron Sulfide (FeS2)

Bivalve Fossil (Clam Shell)

Class Bivalvia

Cowrie Shell Fossil

Cypraea sp.

Basalt

Extrusive Igneous Rock

Fossil Shell

Phylum Mollusca (Gastropod fossil)

Chert / Flint

Silicon Dioxide (Microcrystalline Quartz, $SiO_2$)

Seashell Fossil

Gastropoda fossil

Fossil Snail

Gastropoda (fossilized)

Native Copper

Copper (Cu)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartzite

Quartzite

Pyrite

Iron Sulfide (FeS2)

Olivine

(Mg,Fe)2SiO4

Sedimentary River Rock

Siliciclastic Sedimentary Rock (Quartzite or Sandstone pebble)

Granite

Felsic intrusive igneous rock

Basalt

Extrusive igneous rock

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

Shiva's Eye

Operculum of Turbo shells (Calcium carbonate)

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Silicon dioxide (SiO2) microcrystalline quartz

Limestone

Calcareous sedimentary rock (CaCO3)

Epidote in Quartz

SiO2 with Ca2Al2(Fe3+,Al)(SiO4)3(OH)

Limestone

Limestone (Calcium Carbonate, CaCO3)

Common Quartz Pebble

Silicon dioxide (SiO2) rock fragment

Bivalve Fossil (Mussel or Clam Shell)

Bivalvia

Jasper

Microcrystalline Quartz (SiO2)

Basalt Pebble

Extrusive Igneous Rock

Quartzite Pebble

Metamorphic Quartzite

Gold Nugget

Gold (Au)

Agate Bookend / Quartz Geode

Silicon Dioxide (SiO2)

Peridot

Olivine ((Mg,Fe)2SiO4)

Fossil Coral

Rugosa or Tabulata coral fossil (Calcite/Silica replacement)

Amethyst

Quartz (Silicon Dioxide, SiO2)

Limpets Shell / Fossil Specimen

Patellogastropoda (Class)

Abalone Shell / Mother of Pearl

Haliotis sp. (Nacreous shell layer)

Unknown Dark Stone

Unknown