Metamorphic, Likely Sedimentary With Quartz Veins

Rounded gray metamorphic cobble, likely quartzite or gneiss

Quartz-rich metamorphic rock; possibly quartzite (mostly SiO₂) or banded gneiss

Likely weathered quartz-rich rock, possibly smoky quartz or chert

Quartz (SiO₂), though exact identification is uncertain from the photograph

Pyrite-bearing schist (likely mica schist)

Muscovite–quartz schist with disseminated pyrite (FeS₂)

Gold-bearing Quartz / Auriferous River Rock

Lode Gold in Quartz Matrix (SiO2 + Au)

Mixed Gemstone and Mineral Collection

Silicon Dioxide (SiO2) based minerals and others

Quartz-rich breccia or vein quartz with iron staining

Microcrystalline to crystalline SiO₂, likely quartz with iron oxides/hydroxides and altered host rock

Gold-bearing Quartz

Native Gold (Au) in Quartz (SiO2) matrix

Quartz (Tumbled)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chalcedony (Botryoidal/Agate nodule)

Microcrystalline Quartz (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz (Clear/Crystalline)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Quartz (Milky or Common Quartz)

Silicon Dioxide (SiO2)

Quartz-veined Sandstone

Sedimentary rock with quartz vein (SiO2)

Quartz / Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)

Pyrite on Quartz

Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)

Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Fragment

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Gneiss (with Quartz and Mica)

Gneiss

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Clear Quartz Sphere

Quartz (Silicon Dioxide, SiO2)

Tumbled orange calcite

Calcite (calcium carbonate, CaCO₃)

Quartz-rich pebble, possibly chert or silicified limestone

Microcrystalline quartz (SiO₂), possibly chalcedony; exact identification is uncertain from the photograph

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)