Igneous, Sedimentary, Metamorphic

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Quartz

Quartz (SiO2)

River Pebble (Gneiss/Schist mix)

Metamorphic rock aggregate

Biotite Schist

Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

Fossil shell fragment, likely bivalve or brachiopod

Indeterminate fossilized mollusk/brachiopod; commonly calcite (CaCO₃)

Pyrite

Pyrite (Iron Disulfide), FeS2

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Pyrite

Iron Disulfide (FeS2)

Quartz pebble

Silicon dioxide (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Gneiss

Gneiss (Metamorphic rock)

Tumbled metallic-gray stone, likely hematite or magnetite

Hematite (Fe₂O₃) or magnetite (Fe₃O₄); exact identification requires testing

Quartz (partially iron-stained)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Quartz (specifically Clear or Rose Quartz)

Silicon Dioxide (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Titanium Quartz (Aura Quartz)

Silicon Dioxide (SiO2) treated with Titanium

Quartz Sand Grain / Micro Crystal

Silicon Dioxide (SiO2)

Quartz pebble

Silicon Dioxide (SiO2)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Hematite

Iron(III) oxide (Fe2O3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz Druzy / Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Carnelian (Polished Beads)

SiO2 (Silicon Dioxide - Microcrystalline Quartz)

Pyrite

Iron Disulfide (FeS2)