Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Likely foliated metamorphic rock, possibly schist

Mica schist or micaceous quartzite; exact identification is uncertain from the photograph

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Jasper with Quartz Vein

Silicon Dioxide (SiO2)

Likely tumbled quartz/chalcedony

Quartz (SiO₂), possibly milky quartz or pale chalcedony

River Rock (River Cobbles)

Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)

Quartz

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Fluorite with Quartz coating

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Clear Quartz (Faceted)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Banded Iron Formation

Banded Iron Formation (BIF)

Milky Quartz

Silicon Dioxide (SiO2)

Likely quartz-rich pebble (possibly weathered quartzite)

Quartzite; predominantly SiO₂ (identification tentative from photograph)

Pegmatitic quartz–feldspar rock with mica

Granitic pegmatite; mainly quartz (SiO₂), feldspar, and biotite/muscovite mica

Small weathered stone, possibly quartz-rich granite or feldspar

Indeterminate granitoid fragment; likely quartz (SiO₂) and feldspar, with minor mica or iron oxides

Quartz (Common Quartz Pebble)

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Quartz with Calcite

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)

Quartz-veined Greywacke

Lithic Wacke with Siliceous Veins

Tumbled quartz pebble, likely iron-stained quartz or citrine

Quartz (SiO₂), possibly ferruginous quartz or pale citrine

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite (iron pyrite)

Iron sulfide, FeS₂; commonly called fool’s gold

Rhyolitic Tuff (Breccia Type)

Rhyolitic Pyroclastic Rock (Mixed Silicates including Quartz, Feldspar, and Volcanic Glass)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar, mica, and iron-oxide impurities

Iron-stained Quartz (Gossan/Limonite-coated Quartz)

Silicon Dioxide (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)

Milky Quartz (or Iron-Stained Quartz)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Greenschist (or Serpentinite) with Quartz-Feldspar Vein

Metabasalt / Greenschist Facies Rock

Quartz Heart or Arrowhead Shape

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (SiO2)

Quartz with Mica Schist Matrix

Quartz (SiO2) in Mica Schist Matrix

Quartz Geode

Silicon Dioxide (SiO2)

Shale (possibly Carbonaceous or Oil Shale)

Argillaceous Sedimentary Rock

Basalt with Quartz Veins

Amygdaloidal Basalt (matrix) with Crystalline SiO2 (veins)

Quartz

Silicon Dioxide (SiO2)

Quartz-veined Siltstone

Siltstone with Quartz (SiO2) veins

Likely weathered quartz-rich rock fragment

Uncertain; possibly granitic pegmatite or quartz-bearing metamorphic rock