Not A Rock Or Mineral

Quartz Geode

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Copper-bearing Quartz Vein in Host Rock

Quartz with Malachite/Chrysocolla staining

Granite

Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Vesicular Basalt (Lava Rock)

Vesicular Basalt

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)

Quartz Vein in Basalt or Mafic Rock

Silicon Dioxide (SiO2) vein in volcanic/mafic matrix

River Pebble (Siltstone / Fine-grained Sandstone)

Sedimentary Pebble (Siliclastic)

Sandstone

Arenite (SiO2 dominant)

Granite Pebble with Quartz Vein

Granite (Plutonic Igneous Rock) with Quartz (SiO2)

Gossan (with Limonite/Hematite coating)

Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)

Granite

Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)

Quartz (Clear/Smoky Geode fragment)

Silicon Dioxide (SiO2)

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Sandstone

Sandstone (clastic sedimentary rock)

Note: No specimen visible

Sandstone (with Rock Art)

Sandstone (Clastic Sedimentary Rock)

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

River Stone (likely Basalt or Greywacke)

Basalt with mineral veining

Sandstone with Manganese Dendrites

Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)

Xenolith in Basalt

Mafic Igneous Rock with Felsic Inclusion

Granite

Felsic intrusive igneous rock

Sandstone (Weathered Cobble)

Clastic sedimentary rock (primarily SiO2)

Granite

Intrusive Igneous Rock

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)

Granite / Quartz-Feldspar-Mica Aggregate

Sandstone (Micaceous)

Clastic Sedimentary Rock (primarily SiO2 with Mica)

Schist (likely Mica Schist)

Mica Schist

Sandstone

Arenite (primarily SiO2)

Basalt with Granite Inclusions (Xenoliths)

Mafic igneous rock (Basalt) with Sialic minerals

Red Sandstone

Arenite (primarily quartz with iron oxide cement)

Red Sandstone

Arenite (Iron-rich)

Quartz Geode

Silicon Dioxide (SiO2)

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Quartz with Host Rock

Silicon Dioxide (SiO2)

Orbicular granite (likely rapakivi-type granite)

Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende

Sandstone (with Iron Staining)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) oxides)

Druzy Quartz on Chert/Chalcedony

Silicon Dioxide (SiO2)