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

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Clear quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

Greywacke (River Pebble with Quartz Veins)

Greywacke (Indurated Sandstone); Veins: SiO2 (Quartz)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Sandstone (lithic wacke/conglomerate mix)

Clastic Sedimentary Rock (SiO2 with lithic fragments)

Quartz Veined Mudstone

Metasedimentary rock with Quartz (SiO2) veins

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled Quartz

Silicon Dioxide (SiO2)

Quartz pebble with host matrix

Silicon Dioxide (SiO2)

Banded Gneiss (with Quartz Vein)

Gneiss (SiO2 and varied Silicates)

Vuggy Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

Rose Quartz

Quartz (SiO2) with trace elements of titanium, iron, or manganese

Quartz

Silicon Dioxide (SiO2)

Tumbled gray-green pebble, likely chert or altered volcanic rock

Cryptocrystalline quartz (chert), possibly silicified volcanic material

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Tumbled gray-green metamorphic rock, likely serpentinite or chlorite schist

Serpentinite/chlorite-rich ultramafic metamorphic rock; commonly dominated by antigorite, lizardite, or chlorite with minor magnetite and talc

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone with Fossil Leaf Impression

Sedimentary rock (Sandstone/Siltstone matrix) with Carbonaceous film fossil

Banded Quartz with Host Rock / Quartz Vein Pebble

Silicon Dioxide (SiO2) in Metamorphic Matrix

Quartz

Silicon Dioxide (SiO2)

Quartz (Moss-covered)

Silicon Dioxide (SiO2)

Polished blue banded agate cabochon/ornamental slab

Microcrystalline quartz (chalcedony), SiO₂, with blue coloring or inclusions

Glauconitic Sandstone with possible Trace Fossil

Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Likely calcite or quartz fragment

Uncertain from image; calcite (CaCO₃) is the leading possibility, with quartz (SiO₂) another possibility

Granite with Quartz Vein

Phaneritic intrusive igneous rock (Felsic)

Bicolor Quartz Pebble

Silicon Dioxide (SiO2) with mineral inclusions

Chert (containing Quartz veins)

Chert (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Gravel variety)

Silicon Dioxide (SiO2)

Quartz-rich limestone or calcitic marble

Calcite (CaCO₃), possibly with quartz (SiO₂)

Banded Greywacke

Greywacke (Lithic wacke)

Greenstone with Quartz Veining

Epidiorite or Metabasalt with SiO2 (Quartz) veins

Quartz (Cut and Polished Sphere)

Silicon Dioxide (SiO2)

Quartz Druzy Geode Fragment

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Tumbled granite or granitic gneiss

Granite, typically quartz + feldspar + mica; possibly foliated granitic gneiss

Quartz

Silicon Dioxide (SiO2)