Not A Rock Or Mineral

White Marble

Recrystallized Calcite (CaCO3)

Quartz Veinated Sandstone or Siltstone

Silicon Dioxide (SiO2) within a clastic sedimentary matrix

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

Breciated Limestone with Calcite Veins

Sedimentary Breccia (CaCO3)

Sandstone (with banding)

Arenite (primarily SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Desert Rose

Gypsum (variety Selenite) or Barite, CaSO4·2H2O

Basalt with Calcite Veins

Basalt (containing CaCO3 inclusions)

Granite

Granite (Felsic Plutonic Rock)

Amygdaloidal Basalt

Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Lake Superior Agate

Banded Chalcedony (Silicon Dioxide / SiO2)

Smoky Quartz on Feldspar (Granite Pegmatite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Granite (Thin Section)

Granite (Felsic Plutonic Rock)

Gold Ore in Quartz/Schist

Auriferous Quartz and Sulfide-bearing Schist

Sandstone

Arenite (Sedimentary Rock)

Granodiorite (or Granite) Pebble

Phaneritic Felsic Igneous Pebble

Sandstone (Ferruginous)

Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)

Limonite Concretion

Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O

Basalt with Secondary Mineral Inclusions

Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Sandstone

Arenite (composed primarily of SiO2)

Quartz (Iron-stained or Rose variant)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (likely Arkosic or Lithic Sandstone)

Clastic Sedimentary Rock (SiO2 with assorted minerals)

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Ferruginous Sandstone

Arenite with Iron-oxide cement

Granite

Granite (felsic intrusive igneous rock)

Undetermined Due to Blur (Possible Flesh-Tone Mineral)

Unknown (Insufficient Visual Clarity)

Sandstone

Arenite (primarily SiO2)

Chert (Brecciated Chert)

Silicon Dioxide (SiO2)

Quartz Druse (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

Granite

Granite (compositional mixture of Quartz, Feldspar, and Mica)

Vesicular Basalt with Secondary Mineral Infill

Mafic Volcanic Rock (Basalt)

Granite

Granite

Granite Pebble (Weathered)

Phaneritic Felsic Igneous Rock