Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Orange Calcite

Calcite (Calcium Carbonate - CaCO3)

Chert (Arrowhead Debitage or Spall)

Silicon Dioxide (SiO₂)

Possible flint or slag fragment

Microcrystalline quartz (chalcedony), or iron-rich industrial slag

Pink Orthoclase Feldspar with Dendrites

Orthoclase (KAlSi3O8) with Manganese Oxide dendrites

Quartz with Mica inclusions (Gold-colored Mica)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions

Leland Blue Stone

Anthropogenic Iron Smelting Slag

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Basalt Scoria

Aphanitic basaltic scoria

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Opalite

Synthetic Silicon Dioxide (SiO2)

Opalite

Synthetic glass (SiO2 + metal additions)

Fluorite (Fluor-spar)

Calcium Fluoride (CaF2)

Red Quartzite (Strawberry Quartz)

Quartzite (SiO2 with iron oxide inclusions)

Anthropogenic Heat Source (Electronic/Industrial Interface)

Thermal IR emission (Electronic infrastructure)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Sandstone Concretion

Sedimentary Concretion (Quartz sand bound by mineral cement)

Arfvedsonite (often mistakenly sold as Astrophyllite)

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2]

Rough Diamond (or Quartz Crystal)

Carbon (C) [if Diamond] / Silicon Dioxide (SiO2) [if Quartz]

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Sulfur (with Matrix)

Native Sulfur (S8)

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

Serpentine

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

Green Tourmaline

Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Obsidian

Volcanic glass (SiO2-rich)

Dumortierite Quartz

Dumortierite-bearing Quartz (Al7BO3(SiO4)3O3)

Arsenopyrite with Schist Matrix

Arsenopyrite (FeAsS)

Fluorite (Purple/Blue variety)

Calcium Fluoride (CaF2)

Likely obsidian fragment

Volcanic glass, predominantly rhyolitic composition (SiO₂-rich)

Wild Horse Magnesite

Magnesite with Hematite inclusions (MgCO3)

Obsidian

Volcanic Glass (Amorphous SiO2)

Gold Sheen Obsidian

Volcanic Glass (SiO2 + impurities)

Likely weathered iron-rich rock or slag fragment

Indeterminate; possibly limonite/goethite-bearing rock (FeO(OH)·nH₂O) or industrial iron slag

Likely slag or metallic industrial byproduct

Unidentified iron-rich ferrous slag; possibly magnetite-bearing slag

Obsidian

Volcanic Glass (SiO2)

Likely weathered iron-rich rock or slag fragment

Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)

Howlite

Howlite, Ca₂B₅SiO₉(OH)₅

Likely obsidian (rough fragment)

Volcanic glass, predominantly silica-rich rhyolitic composition (SiO₂-rich, noncrystalline)

Snowflake Obsidian

Volcanic glass containing Spherulitic inclusions (SiO2 + impurities)

Blue Dumortierite Quartz

AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)

Dark blue-black polished crystal, likely fluorite or slag-like geological material

Tentatively fluorite (CaF₂); identification is uncertain from the image alone