Sedimentary Like (Industrial Composite)

Quartz Vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Pelitic or Shaly Matrix

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chalcedony (Agate/Chert)

Silicon Dioxide (SiO₂)

Quartz Geode

Silicon Dioxide (SiO2) in Host Rock

Pegmatite (White Granite variant)

Pegmatitic Granite (Quartz and Feldspar rich)

Mica Schist

Medium-grade regional metamorphic rock (composition varies)

Sandstone

Arenite (primarily SiO2)

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host

Diamond

Native Carbon (C)

Agate and Amethyst (Quartz variants)

Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz

Epidote in Quartz

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Jasper or Agate

Silicon dioxide (SiO2)

Basalt

Basalt (Mainly Plagioclase Feldspar and Pyroxene)

Wishing Stone (Quartz-veined Siltstone or Graywacke)

Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Corundum (Ruby/Sapphire crystal)

Al2O3 (Aluminum Oxide)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sparkling Druzy Quartz on Matrix

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Flint)

Chert (SiO2)

Tourmaline (likely Schorl)

Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4

Fuchsite Quartzite

Fuchsite-bearing Quartzite

Diamond Plate (Steel)

Alloyed Carbon Steel or Aluminum with 'Durbar' pattern

Sandstone (Quartzose)

Arenite (primarily SiO2)

Quartzite (Iron-stained)

Metamorphosed Quartz-rich Rock (SiO2)

Vesicular Basalt

Extrusive mafic igneous rock (primarily Plagioclase feldspar and Pyroxene)

Olivine (Peridot in gem form)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Red Garnet (Pyrope or Almandine)

Magnesium aluminum silicate (Mg3Al2(SiO4)3) or Iron aluminum silicate (Fe3Al2(SiO4)3)

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Chert (often called Flint when dark)

Sedimentary cryptocrystalline quartz (SiO2)

Chert (variant Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Erythrite (or Lab-Grown Cobaltite/Cinnabar Analog)

Erythrite (Co3(AsO4)2·8H2O)

Sandstone

Arenite (composed primarily of SiO2)

Anthracite

Anthracite (Carbon)

Diamond

Diamond (Pure Carbon, C)

Quartz Pebble (Citrine-colored or Stained Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone

Arenite

Rough Topaz

Aluminum silicate fluoride hydroxide [Al2SiO4(F, OH)2]