Likely weathered fossil bone fragment
Indeterminate fossilized bone; taxonomic identification requires microscopy and locality data
fossil
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz (Water-worn Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Arenite (SiO2 primarily)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Biotite on Quartz Matrix
Biotite - K(Mg,Fe)3(AlSi3O10)(OH,F)2 with Quartz (SiO2)
mineral
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)
mineral
Granite-like igneous rock
Likely medium-grained granite or granodiorite; quartz–feldspar–mica aggregate
igneous
Basalt River Pebble
Basalt
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Serpentine / Serpentinite (with Weathering Crust)
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Shale
Shale (Lutite)
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Sandstone or Siltstone)
sedimentary
Granite
Granite (plutonic igneous rock)
igneous
Granite Fragment
Felsic Plutonic Rock (Granite)
igneous
Smoky Quartz (with Iron Inclusions)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Dumortierite Quartz
Dumortierite-bearing Quartz (SiO2 with Al7BO3(SiO4)3O3)
mineral
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Likely quartz-rich rock fragment
Probably microcrystalline quartz (SiO₂), possibly a pale chert or quartzite fragment
mineral
Likely weathered river pebble
Indeterminate lithology; possibly fine-grained sandstone, siltstone, or chert
sedimentary
Peacock Ore (Chalcopyrite)
Chalcopyrite (CuFeS2)
mineral
Schist
Mica Schist
metamorphic
Citrine (Heat-treated or Natural Quartz)
Silicon Dioxide (SiO2)
mineral
Tektite (specifically Indochinite)
Tektite (Natural silica glass)
Mineraloid (Impact glass)
Dyed or coated quartz geode
Quartz geode; silicon dioxide (SiO₂), likely artificially color-enhanced
mineral
Chert / Jasper
Silicon Dioxide (SiO2)
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
Granite
Intrusive Igneous Rock
igneous
Shale
Shale (clastic sedimentary rock)
Sedimentary
Chert (Common Opal/Agate mixture)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Ulexite
NaCaB5O6(OH)6·5H2O
mineral
Blue Dyed Agate Geode
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
N/A (Non-Geological Object)
N/A
Tumbled Peach Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (Clastic Sedimentary Rock)
Sedimentary Rock