Organic Materia (Not A Rock Or Mineral)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cementation)

Granite (including Pegmatite variants)

Phaneritic Plutonic Rock (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Muscovite mica)

Basalt with Epidote (Greenstone)

Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) with Iron Oxide impurities

Milky Quartz (or Iron-Stained Quartz)

Quartz (Silicon Dioxide, SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium trace impurities)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Fuchsite (Green Muscovite)

K(Al,Cr)2(AlSi3O10)(OH)2

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Basalt

Extrusive mafic igneous rock

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)

Red Sandstone

Arenite (with Iron Oxide / Hematite cementation)

Diorite (River Pebble)

Intermediate plutonic igneous rock

Basalt with Iron Oxidation

Vesicular Basalt (Aphanitic Mafic Igneous Rock)

Turquoise

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

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Dalmatian Stone (Dalmatian Jasper)

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Sandstone

Arenite (primarily SiO2)

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)

Sandstone (with Feldspathic/Arkose qualities)

Arenite (primarily SiO2 with KAlSi3O8 components)

Sandstone

Arenite (primarily SiO2)

Sandstone with Iron Oxide

Arenite (SiO2 with Fe2O3 staining)

Sandstone (Quartz-rich)

Sandstone (SiO2 dominated)

Sandstone (Ferruginous)

Arenite (Fe-rich SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone (Quartz-rich)

Arenite (SiO2 based)

Travertine

Travertine (CaCO3 - Calcium Carbonate)

Sandstone (with ripple marks)

Arenite / Quartz Sandstone

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Dragon Blood Jasper (Epidote with Piedmontite or Quartz)

Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))

Blue Lace Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Quartz Geode

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Granite Gneiss

Felsic Gneiss