Sedimentary Or Metamorphic (Low Grade)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky/Crystal variety)

Silicon Dioxide (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Chalcedony

Chalcedony (a microcrystalline variety of Quartz, SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Schist (specifically Mica Schist)

Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)

Sea Glass (often mistaken for Gemstones)

Amorphous Silica (SiO2) with trace additives

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite River Stone

Quartzite (primarily SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Yellow Quartzite or Yellow Jasper

Quartzite (primarily SiO2 with Iron oxide staining)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Quartzite

Quartzite (SiO2)

River Cobble (Phyllite or Quartzite)

Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)

Red aventurine

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Diamond

Carbon (C)

Diamond

Diamond (C)

Quartz Vein with Host Rock (Greywacke/Siltstone)

Silicon Dioxide (SiO2) within Clastic Sedimentary/Metamorphic Matrix

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

General Gravel (River Rock/River Stones)

Mixed Lithic Sediments (Conglomerate Clasts)

Pumice

Pumice (volcanic glass foam)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)