Granite
Intrusive Igneous Rock
igneous
Category
Man Made Object (Simulant)
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Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Basalt with Quartz Vein
Basaltic rock with hydrothermal SiO2 filling
igneous
Metallic sulfide mineral fragment, likely bornite or chalcopyrite
Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Scoria
Vesicular Basalt / Scoria
igneous
Milky quartz fragments
Quartz (silicon dioxide, SiO₂)
mineral
Greenstone
Metabasalt / Greenschist facies rock
Metamorphic
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Basalt
Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Black Pearl (Tahitian-style Cultured Pearl)
Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)
mineral
Tumbled quartz (likely milky quartz)
Quartz — silicon dioxide (SiO₂)
mineral
Quartz with Chlorite or Epidote inclusions
Silicon Dioxide (SiO2) with inclusions
mineral
Ferruginous Quartz
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
mineral
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Raw Chunk)
Silicon Dioxide (SiO2)
mineral
Dyed or color-enhanced agate/microcrystalline quartz bead
Chalcedony (microcrystalline SiO₂), likely agate
gemstone
Tumbled gray-green metamorphic rock, likely serpentinite or chlorite schist
Serpentinite/chlorite-rich ultramafic metamorphic rock; commonly dominated by antigorite, lizardite, or chlorite with minor magnetite and talc
metamorphic
Basalt
Mafic Igneous Rock
igneous
Basalt (Beach Pebble)
Extrusive Mafic Igneous Rock
igneous
Chert breccia
Sedimentary Breccia (Microcrystalline Quartz)
sedimentary
Banded calcite (travertine/cave calcite)
Calcite, CaCO₃; likely banded carbonate travertine or flowstone
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Vesicular Basalt
Extrusive Mafic Igneous Rock (Vesicular Basalt)
igneous
Iron Slag (Industrial Byproduct)
Anthropogenic pyrometallurgical residue
mineral
Granite
Granite
igneous
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
White quartz-rich pebble
Quartz (SiO₂), possibly milky quartz or quartzite
mineral
Quartz Vein in Metamorphic Rock
Quartzite or Schist host with Quartz (SiO2) intrusion
metamorphic
Coquina
Coquina Limestone (CaCO3)
sedimentary
Chert (Nodular Chert)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous