Metallic sulfide mineral fragment, likely bornite or chalcopyrite
Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂)
mineral
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Basalt River Stone
Basalt
igneous
Kidney Stone
Calcium Oxalate (CaC2O4), Uric Acid, or Struvite
mineral
Geode (Unopened)
Quartz Geode (SiO2) / Chalcedony Concretion
mineral
Basalt with Quartz Vein
Mafic volcanic rock with hydrothermal SiO2 filling
igneous
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 with trace Fe2O3)
sedimentary
Sandstone Pebble
Arenite (SiO2 primarily)
sedimentary
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)
mineral
Weathered quartz-rich rock, likely milky quartz or quartzite
Quartz (SiO₂), possibly quartzite with iron-oxide staining
mineral
Likely weathered fossil bone fragment
Indeterminate fossilized bone; taxonomic identification requires microscopy and locality data
fossil
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Shale
Shale (Lutite)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (plutonic igneous rock)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Granite-like igneous rock
Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate
igneous
Biotite on Quartz Matrix
Biotite - K(Mg,Fe)3(AlSi3O10)(OH,F)2 with Quartz (SiO2)
mineral
Hag Stone
Perforated Sedimentary Rock (typically Sandstone or Siltstone)
sedimentary
Basalt River Pebble
Basalt
igneous
Serpentine / Serpentinite (with Weathering Crust)
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Granite Fragment
Felsic Plutonic Rock (Granite)
igneous
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Smoky Quartz (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Dumortierite Quartz
Dumortierite-bearing Quartz (SiO2 with Al7BO3(SiO4)3O3)
mineral
Likely weathered river pebble
Indeterminate lithology; possibly fine-grained sandstone, siltstone, or chert
sedimentary
Likely quartz-rich rock fragment
Probably microcrystalline quartz (SiO₂), possibly a pale chert or quartzite fragment
mineral
Citrine (Heat-treated or Natural Quartz)
Silicon Dioxide (SiO2)
mineral
Tektite (specifically Indochinite)
Tektite (Natural silica glass)
Mineraloid (Impact glass)
Peacock Ore (Chalcopyrite)
Chalcopyrite (CuFeS2)
mineral
Schist
Mica Schist
metamorphic
Granite
Intrusive Igneous Rock
igneous
Dyed or coated quartz geode
Quartz geode; silicon dioxide (SiO₂), likely artificially color-enhanced
mineral
Shale
Shale (clastic sedimentary rock)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Polished brecciated jasper
Jasper, opaque microcrystalline quartz (SiO₂), likely brecciated jasper with iron-oxide and dark silicate inclusions
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary