Man Made Glass (Not A Natural Rock Or Mineral)

Druzy Quartz

Quartz (Silicon Dioxide, SiO2)

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

Sandstone

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Quartzose)

Sandstone (clastic sedimentary rock, primarily SiO2)

Sandstone (lithic/greywacke variant)

Clastic sedimentary rock (primarily SiO2 with rock fragments)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Green Druzy Quartz (Prasiolite)

Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)

Synthetic Blue Aura Quartz

Silicon Dioxide (SiO2) with Metallic Infusion

Dyed Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Granite (Background) and Quartzite/River Pebble (Foreground Heart)

Phaneritic Felsic Igneous Rock (Granite background)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Sandstone (likely Arkosic)

Arenite (SiO2 with KAlSi3O8)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Granite

Phaneritic Plutonic Felsic Rock

Chert (Jasper variety) with Iron Oxide staining

Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities

Smoky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar intrusive rock)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Conglomerate

Conglomerate (clastic sedimentary rock)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Cat's Eye Moonstone (Simulated/Synthetic or natural Cat's Eye Quartz/Glass)

There is no single scientific name. The appearance suggests either: Moonstone (feldspar group), Cat's Eye Quartz (SiO2), Apatite (Ca5(PO4)3(F,Cl,OH)), or most likely a synthetic material such as Fiber Optic Glass or 'Opalite' (a type of glass).

Quartz Druze (on Matrix)

Silicon Dioxide (SiO2)

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

Green Aventurine

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

Banded Agate (Onyx type)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)

Granodiorite

Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)

Iron Slag

Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Terracotta (Man-made ceramic brick fragment)

Baked clay / High-iron ceramic (Silicate-based ceramic)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Sandstone

Arenite

Hag Stone

Porous sedimentary rock (typically Flint, Chert, or Sandstone) with naturally occurring holes

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Prasiolite

Silicon Dioxide (SiO2) with iron impurities

Citrine

Silicon Dioxide (SiO2) with iron impurities

Diamond in Kimberlite

Diamond (C in Kimberlite Matrix)

Sandstone

Arenite (primarily SiO2)

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Smoky Quartz

SiO2 (Silicon Dioxide)