Synthetic (Not A Rock Or Mineral)

Shale

Shale (Lutite)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)

Amygdaloidal Basalt

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

Red Sandstone

Arenite

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz on Feldspar (Granite Pegmatite)

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

Granite (Thin Section)

Granite (Felsic Plutonic Rock)

Granodiorite (or Granite) Pebble

Phaneritic Felsic Igneous Pebble

Limonite Concretion

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

Sandstone (likely Arkosic or Lithic Sandstone)

Clastic Sedimentary Rock (SiO2 with assorted minerals)

Boxwork Quartz / Septarian Jasper

Boxwork (SiO2 with iron oxide inclusions)

Ferruginous Sandstone

Arenite with Iron-oxide cement

Granite

Granite (felsic intrusive igneous rock)

Chert (Brecciated Chert)

Silicon Dioxide (SiO2)

Granite

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

Banded Gneiss (River Rock/Pebble)

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

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)

Limonite (Iron-rich Siltstone / Sandstone base)

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

Bauxite

Bauxite (Al2O3·2H2O)

Agate Geode with Quartz Druzy

Chalcedony (SiO2) and Quartz (SiO2)

Druzy Quartz on Matrix (likely Limestone or Sandstone)

Silicon Dioxide (SiO2) with various trace impurities

Basalt with Calcite Veins

Basalt (containing CaCO3 inclusions)

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Chalcedony (Agate)

Silicon Dioxide (SiO2)

White Topaz

Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2

Hematite Nodules (Moqui Marbles style)

Iron Oxide (Fe2O3)

Clear Quartz

SiO2 (Silicon Dioxide)

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Granite)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety

Sandstone (Ferruginous)

Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)

Sandstone

Arenite (Sedimentary Rock)

Boxwork Siderite or Sepatarian Nodule Weathering

Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment

Sandstone (likely Graywacke or Lithic Sandstone)

Clastic Sedimentary Rock

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (SiO2 primarily)

Asphalt Concrete

Bituminous conglomerate

Sandstone (Quartzose)

Arenite (primarily SiO2)

Agate

Silicon dioxide (SiO2) - variety Chalcedony

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2 primarily)