Orthoclase Feldspar (Granitic)
KAlSi3O8 (Potassium Feldspar)
igneous
Category
Manufactured Glass
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Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz/Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz Vein Rock
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Sandstone (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Coarse Sand and River Gravel
Siliciclastic Sediment (primarily Quartz and Feldspar)
sedimentary
Orange Quartz
Silicon Dioxide (SiO2) with iron inclusions
mineral
Sandstone
Arenite
sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of quartz, SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Microcline Feldspar
KAlSi3O8
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Clastic Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
K-Feldspar / Granite Pegmatite
Potassium Feldspar (Microcline/Orthoclase) with Quartz
igneous
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Rock
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary quartz arenite
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2) with miscellaneous inclusions
mineral
Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary