Organic Materia (Not A Rock Or Mineral)

River Stone (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) based metamorphosed sandstone

Quartz on Host Rock

Silicon Dioxide (SiO2)

Shale

Fissile Mudstone

Ferruginous Sandstone Pebble

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH) staining)

Diorite (Spotted or Dalmatian Stone pattern)

Diorite

Amber (Burmite)

Fossilized tree resin (Succinite variant)

Basalt (Weathered Pebble)

Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene

Vesicular Basalt (Pumice-like)

Vesicular Basalt

Granodiorite

Granodiorite (containing Plagioclase, Quartz, and Biotite)

Serpentine

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

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

River Pebble (Quartz/Jasper)

Silicon Dioxide (SiO2)

Dalmatian Jasper

Peralkaline rhyolite

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Coarse-grained Quartz with Feldspar inclusions

Crystalline Quartz (SiO2) with Orthoclase/Plagioclase Feldspar inclusions

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Ironstone Concretion (Moqui Marble variety)

Ferruginous Sandstone Concretion

African Turquoise

African Turquoise (a trade name for Jasper, a variety of Chalcedony: SiO2)

Herkimer Diamond

Quartz (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Diorite (with Salt-and-Pepper Texture)

Diorite (Intrusive Igneous Rock)

Basalt

Extrusive mafic igneous rock

Sandstone (Pebble)

Arenite (primarily SiO2)

Basalt

Basalt (Aphanitic mafic volcanic rock)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Sandstone (specifically Cross-bedded Sandstone)

Arenite (composed primarily of SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartzite with inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Gneiss (specifically a Banded Gneiss cobble)

Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)

Quartz Vein Outcrop

Silicon Dioxide (SiO2)

Turquoise

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

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Ferruginous Quartz Cobble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Giallo Ornamental Granite

Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Sandstone

Arenite (SiO2 based clastic rock)

Clear Quartz

Silicon Dioxide (SiO2)

Drupa Quartz (Sparkly Drusy Quartz on Matrix)

Crystalline Silicon Dioxide (SiO2) on host rock

Conglomerate

Conglomerate (Detrital sedimentary rock)

Larimar

Pectolite [NaCa2Si3O8(OH)] with copper substitution