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

Ferruginous Quartz (Carnelian-tinted Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone Anvil / Nutting Stone

Quartzose Sandstone (Sedimentary Rock)

Greywacke (River Pebble)

Greywacke sandstone with quartz veining

Yellow Quartz (Chalcedony or Agate)

Silicon Dioxide (SiO2)

Basalt with Quartz/Calcite Veins

Basalt (Aphanitic Mafic Volcanic Rock) with Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) inclusions

Graywacke with Quartz Veins

Argillaceous Sandstone (Graywacke)

Faceted yellow gemstone, likely citrine

Citrine (quartz), SiO₂; possibly yellow sapphire or synthetic glass without testing

Basalt with Quartz/Calcite Inclusion

Aphanitic Mafic Igneous Rock (Basalt) with SiO2 or CaCO3 vein

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Banded Iron Formation / Chert with Quartz Veining

Banded Iron Formation (BIF) / Cryptocrystalline Quartz (SiO2)

Polished dark chert or flint

Microcrystalline quartz (SiO₂), commonly called chert; possibly flint

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Gneiss with Quartz Veining

Gneiss (High-grade Regional Metamorphic Rock)

Sandstone with Quartz Veining

Arenite with hydrothermal quartz (SiO2)

Iron-rich jasper / hematite-bearing breccia

Ferruginous jasper, chiefly microcrystalline SiO₂ with hematite/goethite (Fe₂O₃/FeO(OH)) and possible limonite

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Polished river pebble, likely granite or granitic gneiss

Quartz–feldspar–mica aggregate; possibly biotite granite (compositionally near granite)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Asphalt (Bituminous Concrete)

Asphaltum / Bitumen-Aggregate Matrix

Likely galena-bearing ore

Galena (lead sulfide, PbS), possibly mixed with quartz or other sulfides

Brecciated Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Blue Chalcedony

Microcrystalline Quartz (SiO2)

Quartz / Quartzite Fragment

Silicon Dioxide (SiO2)

Yellow Jasper

SiO2 (Microcrystalline Quartz)

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides

Likely weathered sandstone or quartzite

Quartz-rich sandstone; possibly metamorphosed to quartzite (SiO₂-dominant)

Banded Sandstone / Quartzite with Mineral Veins

Sedimentary rock (Quartz arenite with iron oxide/silica banding)

Rounded quartz-rich pebble

Likely milky quartz (SiO₂), possibly quartzite or a quartz-rich river pebble

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Weathered quartz-rich metamorphic rock, possibly quartzite

Quartzite; predominantly quartz (SiO₂), with minor feldspar, mica, and iron-oxide staining

Basalt with Quartz Veins

Aphanitic Mafic Igneous Rock (Main body: SiO2, Fe, Mg rich)

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Red Jasper

SiO2 (Silicon Dioxide with Hematite inclusions)

White Quartz (Carved Star)

Silicon Dioxide (SiO2)

Jasper with Quartz inclusions

Silicon Dioxide (SiO2) - Microcrystalline Chalcedony

Weathered fine-grained stone, likely sandstone or quartzite

Quartz-rich sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂