Sandstone with Desert Varnish
Arenite (SiO2 predominantly) with Ferromanganese coating
sedimentary
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Basalt with Quartz/Calcite Veins
Aphanitic Mafic Igneous Rock (Hydrothermal Veined)
igneous
Granite
Granite
igneous
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Quartz Crystal on Matrix
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8
mineral
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Unknown Tumbled Stone
Unknown (Too Blurry)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a sedimentary or volcanic shell
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Herkimer Diamond
Quartz (Silica - SiO2)
mineral
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Sandstone with Concretions / Liesegang Rings
Arenite with iron oxide banding
sedimentary
Sandstone
Arenite
sedimentary
Banded Sandstone
Arenite (with iron oxide banding)
sedimentary
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Pumice
Pumice (volcanic rock)
Igneous
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Gneiss (Pebble)
Gneiss
metamorphic
Slate with Quartz Vein
Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)
metamorphic
Vesicular Basalt (or Scoraceous Basalt)
Basalt (Vesicular texture)
igneous
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Orange Quartz (or Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
Banded Greywacke
Greywacke (Lithic wacke)
sedimentary
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in a sedimentary or volcanic host
mineral
Orbicular Jasper (Ocean Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Plume Agate or Moss Agate
Agate (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Quartz (Druzy on Matrix)
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Granular variety)
Silicon Dioxide (SiO2)
mineral
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8)
mineral