Weathered sandstone fragment
Sandstone, chiefly quartz (SiO₂) with feldspar and iron-oxide cement
sedimentary
Category
Non Geological
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Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Ironstone concretion (possible limonite/goethite-rich piece)
Iron-oxide-rich ironstone; commonly composed of goethite (FeO(OH)) and/or limonite
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Red Jasper
Microcrystalline Quartz (SiO2) with Hematite impurities
sedimentary
Concrete rubble
Anthropogenic conglomerate
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Raw greenish crystal/mineral fragment
Uncertain from image; possibly olivine (forsterite-rich), epidote, or green tourmaline
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Weathered polymictic gravel/conglomeratic rock
Polymictic conglomerate or poorly lithified alluvial gravel; chiefly quartz, feldspar, mica, and dark lithic fragments
sedimentary
Obsidian
Volcanic Glass (SiO2 dominant)
igneous
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Quartz with Mica inclusions (Gold-colored Mica)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions
Mineral
Small tumbled brown stone, likely iron-stained quartz or jasper
Quartz (SiO₂) or microcrystalline quartz (chalcedony/jasper), identification uncertain from the image
mineral
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Snowflake Obsidian
Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions
igneous
Quartzite
Metamorphic Quartzite
metamorphic
Likely calcite fragment
Calcite (calcium carbonate, CaCO₃)
mineral
Obsidian
Amorphous volcanic glass (70-75% SiO2)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pink Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Glass Nugget (Tumbled Glass)
Amorphous Silicon Dioxide (SiO2) with additives
mineraloid (man-made)
Quartzite
Quartzite (SiO2)
metamorphic
Ironstone Concretion
Ironstone (Siderite/Goethite/Hematite matrix)
sedimentary
Gemstone ring, likely emerald and opal
Green beryl (Be₃Al₂Si₆O₁₈), with probable common opal (hydrated amorphous silica, SiO₂·nH₂O)
gemstone
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Rounded iron-rich stone or concretion
Indeterminate; possibly hematite-/goethite-bearing sandstone or an ironstone concretion
sedimentary
Emerald and diamond ring
Emerald: beryl, Be3Al2Si6O18, colored green by chromium and/or vanadium; surrounding stones appear to be diamonds, crystalline carbon (C)
gemstone
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Obsidian
Volcanic glass (SiO2 - Silicon dioxide predominant composition)
Igneous
Drill Core Sample
Cylindrical Rock Core (Specific mineralogy varies by extraction site)
Metamorphic (Likely Gneiss or Schist based on texture)
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
River Cobble (Quartzite / Granitic Gneiss)
Metamorphic Quartzite / Granitic Gneiss
metamorphic
Black tourmaline pendant
Schorl tourmaline, NaFe3Al6(BO3)3Si6O18(OH)4
mineral
Quartzite (Orthoquartzite)
SiO2 (Silicon Dioxide) with Iron Oxide inclusions
metamorphic
Polished leopard-skin jasper
Orbicular jasper; microcrystalline quartz/chalcedony (SiO₂) with iron-oxide inclusions
mineral