Industrial Byproduct (Anthropogenic Rock Like Material)

Jasper / Chert (Red)

Cryptocrystalline quartz (SiO2)

Phyllite

Phyllite (regional metamorphic rock)

Granite

Phaneritic plutonic rock (Quartz + Feldspar + Mica)

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Sandstone (with Calcite or Silica veins)

Clastic sedimentary rock (primarily SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2 principal)

Chert (Chert Nodule)

Microcrystalline quartz (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions

River Jasper (Chert/Chalcedony mix)

Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions

Sandstone

Clastic Sedimentary Rock

Bauxite

Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (SiO2 based)

Sandstone

Sedimentary Rock (Quartz arenite)

Rainbow aura quartz cluster

Quartz, silicon dioxide (SiO₂), artificially coated with a thin metallic film

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Sandstone (Ferruginous)

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

Scoria

Scoria (Vesicular Basaltic Rock)

Red Sandstone

Ferruginous Sandstone (SiO2 with Fe2O3)

Sedimentary Sandstone

Arenite (Sedimentary Rock)

Epidote-bearing Rock / Epidote Inclusion

Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock

Black Diamond (Carbonado)

Carbonado (Polycrystalline Diamond)

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Red Sandstone

Arenite (with Iron Oxide cement)

Sandstone

Arenite (SiO2 primarily)

Chert (and Flint)

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (composed mostly of SiO2)

Garnet (Almandine)

Almandine, Fe3Al2(SiO4)3

Pumice

Pumice (a highly vesicular volcanic glass)

Schist

Mica Schist

Sandstone

Arenite (composed primarily of SiO2)

Siltstone

Siltstone (composed of microscopic quartz and clay minerals)

Chert (and Jasper/Chalcedony mixture)

Microcrystalline Quartz (SiO2)

Pegmatite

Igneous Pegmatite

Sandstone

Clastic sedimentary rock

Polished red banded stone, likely rhodonite

Rhodonite — manganese inosilicate, MnSiO₃; possibly rhodochrosite or dyed quartz

Sandstone

Arenite (SiO2 based)

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Quartzite (River Stone)

Quartzite (SiO2)

Siltstone Pebble

Siltstone (composed of siliciclastic grains)

Basalt

Basalt