Metamorphic, Likely Sedimentary With Quartz Veins

Pink quartz bead strand (likely rose quartz or pink dyed quartz)

Quartz, silicon dioxide (SiO₂); probable rose quartz variety, possibly dyed or treated quartz/chalcedony

Chalcedony (Agate/Chert)

Microcrystalline Quartz (SiO2)

Rounded sedimentary pebble, likely mudstone or shale

Argillite/mudstone; predominantly compacted clay minerals with quartz and iron oxides

Yellow Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Weathered iron-stained quartzite or jasper

Quartzite dominated by quartz (SiO₂), with iron oxides/hydroxides such as hematite and limonite

Quartz Crystal with Inclusions

Silicon Dioxide (SiO2)

Quartz (Quartzite / Iron-stained Quartz)

Silicon Dioxide (SiO2)

Multi-gemstone Quartz and Fluorite Bracelet

Silicon Dioxide (SiO2) and Calcium Fluoride (CaF2)

Quartz (Milky Quartz / Quartzite)

Silicon Dioxide (SiO2)

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Zebra Jasper (with Chlorite/Epidote)

Silicon Dioxide (SiO2) with inclusions

Unidentified gray-brown stone

Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image

Feldspar-rich Quartzite

Meta-arkose (Quartz-Feldspar Quartzite)

Pyrite

Iron Disulfide (FeS2)

Quartz-rich rock, possibly milky quartz or quartzite

Quartz (silicon dioxide, SiO₂); if granular and foliated, likely quartzite

River Pebbles (Basalt and Graywacke/Limestone)

Mafic Volcanic Rock / Impure Sandstone

Rounded river pebble, likely weathered quartzite or sandstone

Quartzite (mostly SiO₂), possibly ferruginous sandstone

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Quartz (Orange/Pink variety)

Silicon Dioxide (SiO2)

Rounded pale quartz-rich pebble

Likely milky quartz or quartzite (SiO₂); exact identification is uncertain from the photograph

Weathered quartz-rich sandstone or quartzite

Quartzite (predominantly SiO₂), possibly strongly cemented sandstone

Quartz-rich metamorphic rock (likely mica schist or gneiss)

Quartz–feldspar–mica assemblage; probable biotite schist/gneiss

White Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Tumbled reddish sandstone pebble

Quartz-rich sandstone, likely ferruginous arkose or quartz arenite

Pyrite-bearing metamorphic rock (likely schist or gneiss)

Pyrite (FeS₂) in a quartz–mica-rich host rock

Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)

Silicified limestone or banded sedimentary rock with mineral veins

Quartz vein in weathered host rock

Milky quartz (SiO₂), likely in a granitic or metamorphic matrix

Clear Quartz (Rock Crystal) Bracelet

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Weathered iron-rich sandstone or lateritic rock

Ferruginous sandstone/laterite; chiefly quartz (SiO₂) with iron oxides such as hematite and goethite

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky / Massive Quartz)

Silicon Dioxide (SiO2)

Yellow Quartzite (Onyx Pebble)

Silicon Dioxide (SiO2) - Quartzite

Quartz Vein in Hematitic Siltstone

Hydrothermal Quartz (SiO2) in Ferriferous Matrix