This Is Not A Rock Or Mineral

Granite (Thin Section)

Granite (Felsic Plutonic Rock)

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (Sedimentary Rock)

Granodiorite (or Granite) Pebble

Phaneritic Felsic Igneous Pebble

Limonite Concretion

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

Basalt with Secondary Mineral Inclusions

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

Sandstone (Ferruginous)

Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Sandstone

Arenite (composed primarily of SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained or Rose variant)

Silicon Dioxide (SiO2)

Sandstone (likely Arkosic or Lithic Sandstone)

Clastic Sedimentary Rock (SiO2 with assorted minerals)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Granite

Granite (felsic intrusive igneous rock)

Ferruginous Sandstone

Arenite with Iron-oxide cement

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Chert (Brecciated Chert)

Silicon Dioxide (SiO2)

Quartz Druse (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Granite

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

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)

Granite

Granite

Common Opal in Host Rock

Hydrated Silica (SiO2·nH2O)

Granite Pebble (Weathered)

Phaneritic Felsic Igneous Rock

Undetermined Due to Blur (Possible Flesh-Tone Mineral)

Unknown (Insufficient Visual Clarity)

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

Lapis Lazuli

Sodium aluminum silicate with sulfur (main component: Lazurite [(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2])

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

Bauxite

Bauxite (Al2O3·2H2O)

Vesicular Basalt with Secondary Mineral Infill

Mafic Volcanic Rock (Basalt)

Diamond (in Matrix)

Carbon (C)

Goethite

Goethite (FeO(OH))

Druzy Quartz on Matrix (likely Limestone or Sandstone)

Silicon Dioxide (SiO2) with various trace impurities

Quartz on Basalt

Silicon Dioxide (SiO2) on Mafic Igneous Rock

Hematite Nodules (Moqui Marbles style)

Iron Oxide (Fe2O3)

Clear Quartz

SiO2 (Silicon Dioxide)

Jasper (Multi-color Chert)

Silicon dioxide (SiO2)

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Granite)