Quartz

Prase Quartz on Feldspar

Quartz (Silicon Dioxide, SiO2) with Hedenbergite inclusions on Potassium Feldspar (KAlSi3O8)

Tumbled quartz crystal, possibly rose quartz

Quartz (SiO₂), likely iron- or manganese-tinted varieties

Pyrite with Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Hemimorphite or Red Quartz

SiO2 (Quartz) / Zn4Si2O7(OH)2·H2O (Hemimorphite)

Pyrite in Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Quartz Vein in Rhyolite

Silicon Dioxide (SiO2) in extrusive igneous rock

Quartz with Mica Schist (Pegmatite Specimen)

SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz with Iron Inclusions

SiO2

Tumbled chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Rough Rose Quartz

Quartz (Silica - SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (composed primarily of Silica, SiO2)

Quartzite

Quartzite (SiO2)

Aventurine

Quartz (SiO2) with fuchsite inclusions

Quartzite

Quartzite (primarily SiO2)

White quartz pebble or chip

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Likely rose quartz

Quartz, SiO₂; crystalline silicon dioxide

Quartz-rich rock (likely quartzite)

Quartzite, composed predominantly of quartz (SiO₂)

Iron-stained quartz-rich rock

Likely ferruginous quartzite; chiefly quartz (SiO₂) with iron oxides/hydroxides

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, such as granite, or recrystallized quartzite

Quartz-bearing metamorphic rock, likely schist or quartzite

Quartz (SiO₂) in a mica-rich metamorphic matrix

Raw rose quartz (likely quartz)

Quartz, silicon dioxide (SiO₂), commonly with trace inclusions causing pink color

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)