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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal Rock

Silicon Dioxide (SiO2)

Possible iron-rich chert or slag-like rock

Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image

Jasper

Microcrystalline Quartz (SiO2)

Tumbled black-and-white stone, likely dendritic agate or jasper

Cryptocrystalline quartz (SiO₂), possibly chalcedony with manganese-oxide dendrites

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Weathered quartz-rich rock, likely granite or granitic gneiss

Granite (quartz–feldspar–mica aggregate), possibly weathered granitic gneiss

Milky Quartz in Shale

Silicon Dioxide (SiO2) in sedimentary host rock

Sedimentary rock with quartz veining

Laminated siltstone or mudstone with hydrothermal quartz veins

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)

Silicon Dioxide (SiO2) with iron inclusions

Chert with Quartz Veining

Microcrystalline silica (SiO2)

Clear Quartz (Rock Crystal) Bracelet

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Tumbled red jasper with a quartz vein

Jasper (microcrystalline quartz, SiO₂), likely crossed by milky quartz

Chert (Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon dioxide (SiO2)

Likely quartzite pebble

Quartzite, predominantly crystalline SiO₂

Quartz (specifically Citrine or Yellow Quartzite pebble)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Banded Gneiss with Quartz Vein

Gneiss (High-grade Regional Metamorphic Rock)

Granite or granitic gneiss

Felsic granitoid, chiefly quartz, feldspar, and mica; possibly weakly foliated gneiss

Quartz (Chert / Agate / Chalcedony)

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Quartz (Druzy on Matrix)

Silicon Dioxide (SiO2)

Likely granite or granitic gneiss

Quartz–feldspar–mica aggregate; possibly foliated granitic gneiss

Quartz

Silicon Dioxide (SiO2)

Iron-rich weathered rock or limonite/goethite nodule

Limonite (mixture dominated by goethite, FeO(OH)·nH₂O), possibly with quartz or clay

Flint (chert), possibly fossil-bearing

Microcrystalline quartz (SiO₂), chalcedony/flint variety

Quartz Pebble

Silicon Dioxide (SiO2)

Tumbled yellow calcite

Calcite (calcium carbonate, CaCO₃)

Quartz Druzy (on Matrix)

Silicon Dioxide (SiO2)

Likely weathered granite or granitic gneiss

Granite; quartz–feldspar–mica aggregate (possibly foliated gneiss)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Granite Gneiss

Gneiss (derived from granitic protolith)

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Dark granite or granitic gneiss

Granite; quartz + feldspar + biotite/hornblende, possibly weakly gneissic