All rocks & minerals

Granite

Intrusive Igneous Rock

Blue Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Quartz Pebble

Silicon dioxide (SiO2)

Quartz in Matrix

Silicon Dioxide (SiO2)

Banded Iron Formation (Fragment)

Banded Iron Formation (BIF)

Lake Superior Agate

Silicon dioxide (chalcedony variety quartz)

Petrified Wood

Silicified Wood (SiO2)

River Pebble

Weathered Rock Fragment

Pitted Limestone with Honeycomb Weathering

Karst-weathered fossiliferous limestone (CaCO3)

Quartzite

Metamorphic Quartzite

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphic Quartzite

Jasper

Microcrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Granite

Felsic intrusive igneous rock

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Sandstone

Quartz Arenite / Clastic Sedimentary Rock

Quartz

Silicon Dioxide (SiO2)

Biotite Mica Schist

Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Basalt Pebble

Aphanitic Igneous Rock

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Muscovite Schist

Metamorphic rock primarily composed of quartz and muscovite mica

Quartz

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Raw Quartz

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble

Silicon dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Chert / Flint

Microcrystalline quartz (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Metamorphosed Quartz Sandstone