Mineral, Specifically A Rock Fragment

Sandstone (with potential Quartzite characteristics)

Clastic sedimentary rock (primarily SiO2)

Diamond

Carbon (C), specifically in an isometric crystal system.

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz and/or feldspar)

Sandstone (Quartzite-rich Pebble)

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Sandstone (Quartzite-rich Pebble)

Arenite (composed primarily of SiO2)

Red Sandstone

Arenite (with Iron Oxide)

Banded Sandstone (Zebra Stone)

Arenite with Iron Oxide Banding (Liesegang rings)

Sandstone (Pebble)

Clastic sedimentary rock (SiO2 primary)

Sandstone (Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Quartzose Sandstone with mineral staining)

Arenite (composed mainly of SiO2)

Sandstone

Arenite (primarily SiO2)

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Sandstone (Ferruginous)

Arenite (Fe2O3 staining)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Oolite or Oolitic Limestone

Oolitic Limestone (Principal mineral: Calcite, CaCO3)

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Sandstone (River Pebble)

Arenite (primarily SiO2)

Sandstone (Water-worn Cobble)

Arenite (variable composition, primarily SiO2)

Sandstone (Flagstone)

Arenite (composed primarily of SiO2)

Sandstone (Water-worn)

Arenite

Red Sandstone (Arkose)

Clastic Sedimentary Rock (Lithic Arkose)

Sandstone (likely Quartzose)

Arenite (SiO2 principal mineral)

Banded Agate (specifically Carnelian Agate color)

Silicon Dioxide (SiO2) - variety of Chalcedony

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Banded Agate (Onyx type)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Fossilized Bone Fragment

Permineralized Skeletal Element (Likely Vertebrate)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Turquoise

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

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Sandstone

Arenite (SiO2 based with quartz grains)

Red Sandstone

Arenite (Fe2O3-rich)

Green Aventurine

Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)