Not A Rock Or Mineral

Painted River Pebble (likely Basalt or Greywacke)

Aphanitic Lithic Clast with Anthropogenic Pigment coating

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Unable to identify - Image contains non-geological items

Sandstone (with potentially high Feldspar/Arkose content)

Clastic sedimentary rock (SiO2 dominated)

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz Geode (likely within Limestone or Dolomite matrix)

Quartz (SiO₂)

Gneiss

High-grade regional metamorphic rock (Foliated)

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Unakite

Epidotized Granite

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 oxides)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Slate with Quartz Vein

Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Herkimer Diamond

Quartz (Silica - SiO2)

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

Banded Slate or Siltstone with Quartz/Calcite Veins

Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Banded Gneiss

Gneiss (high-grade metamorphic silicate rock)

Quartz (Druzy on Matrix)

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Quartz-veined Mudstone or Argillite

SiO2 (Quartz) in Siltstone/Mudstone matrix

Sandstone with Concretions / Liesegang Rings

Arenite with iron oxide banding

Sandstone

Arenite

Banded Sandstone

Arenite (with iron oxide banding)

Quartz (Milky/Crystalline)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (Siliclastic Sedimentary Rock)

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Desert Varnish on Sandstone

Ferromanganese coating on Quartz Arenite

Shale

Shale (clastic sedimentary rock)

Gneiss (Pebble)

Gneiss

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Geode (Unopened)

Siliceous Geode (SiO2)

Sandstone

Arenite (primarily SiO2)

Basalt with Iron Oxidation (Lattice/Veined)

Mafic Volcanic Rock (principally Plagioclase and Pyroxene)

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)