Tiny metallic mineral fragment, possibly native gold
Native gold (Au), unconfirmed; could also be pyrite or chalcopyrite
mineral
Category
Man Made Byproduct (Non Geological)
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Quartzite
Quartzite (primarily SiO2)
metamorphic
Metaconglomerate
Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Ferruginous Quartzite (Red Quartzite)
Quartzite (primarily SiO2 with Fe2O3 inclusions)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphosed Sandstone (Mainly SiO2)
metamorphic
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Ironstone Concretion
Ironstone (Siderite/Goethite/Hematite matrix)
sedimentary
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
sedimentary
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Pink sandstone
Quartz-rich siliciclastic sandstone, likely arkose or subarkose
sedimentary
Obsidian
Volcanic Glass (Primary component: SiO2)
igneous
Gemstone bead necklace (likely citrine or yellow quartz)
Quartz, SiO₂; precise identification is uncertain because the beads are blurred and metal settings obscure them
gemstone
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartz with Mica inclusions (Gold-colored Mica)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions
Mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Volcanic glass (SiO2-rich)
igneous
Barite
Barium Sulfate (BaSO4)
mineral
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Rounded quartz-rich pebble, possibly granite or gneiss
Indeterminate granitoid; likely quartz–feldspar–biotite aggregate
igneous
Weathered sandstone cobble
Quartz-rich sandstone, primarily SiO₂ with clay/iron-oxide cement
sedimentary
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Gold Ore (in Quartz/Sulfide matrix)
Native Gold (Au) in Quartz (SiO2) and Pyrite (FeS2)
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (mostly amorphous SiO2)
igneous
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Obsidian
Obsidian (Amorphous volcanic glass, SiO2 with impurities)
igneous
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Rainbow Obsidian
Volcanic glass (SiO2 - approximately 70% or more silicon dioxide)
Igneous
Blue-beaded gemstone jewelry, likely lapis lazuli or dyed blue agate
Uncertain from the image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or blue chalcedony (SiO₂)
gemstone
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Quartzite
Metamorphic rock composed primarily of quartz (SiO2)
metamorphic