Anthropogenic (Human Made) Sedimentary Like Material

Sandstone (Quartzose)

Arenite (primarily SiO2)

Red Quartzite River Pebble

Quartzite (SiO2 with iron oxide inclusions)

Pumice

Pumice (a highly vesicular volcanic rock)

Diorite

Diorite

Obsidian

Volcanic Glass (SiO2)

Basalt

Basalt (Fine-grained extrusive igneous rock)

Sandstone

Arenite (primarily SiO2)

Jasper with Quartz

Silicon Dioxide (SiO2) - Chalcedony variety

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Jasper and Yellow Chert (Tumbled)

Microcrystalline Quartz (SiO2)

Schist

Mica Schist

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Granodiorite

Granodiorite (Na,Ca)(Al,Si)4O8

Quartzite

Quartzite (SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Ventifact

Eolian Ventifact (often composed of basalt, chert, or quartzite)

Jasper, Agate, Quartz Mix (Polished Beads)

SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.

Granite Cobble (River Stone)

Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)

Sandstone (likely Siltstone)

Arenite or Siltstone (high SiO2 content)

Lepidolite on Pegmatite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide)

Quartz (likely a macrocrystalline variety like milky quartz or smoky quartz, given the appearance in the image)

Quartz (SiO₂ - Silicon Dioxide)

Calcite

Calcite (CaCO3)

Magnetite

Magnetite (Fe3O4)

Chalcedony or Chert/Jasper with secondary mineral staining

SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Chlorastrolite (Greenstone)

Chlorastrolite (variety of Pumpellyite) - Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2 · H2O

Dyed Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Granite / Gneiss Complex

Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)

Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Pyrite (on host rock)

Iron Sulfide (FeS2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)

Serpentine

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

Rough Quartz (Alluvial Pebbles)

Silicon Dioxide (SiO2)

Manganese Ore (Psilomelane/Pyrolusite)

Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)

Quartz (specifically Clear and Rose Quartz)

Silicon Dioxide (SiO2)

Iron Slag

Vitreous glassy waste (Fe-Si-Al-Ca compounds)

Porous Quartzite

Metamorphosed Quartz-rich Sandstone (SiO2)