Red Quartzite / River Siltstone
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Category
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Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Basalt (Vesicular/Waterworn)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Vesicular Limestone with Borings
Fossiliferous Calcarenite (Calcium Carbonate, CaCO3)
sedimentary
Waterworn Pebble / Quartzite
Metamorphic/Sedimentary rock fragment
sedimentary
Iron-rich sandstone or lateritic rock
Ferruginous sandstone; predominantly quartz (SiO₂) cemented or stained by iron oxides/hydroxides
sedimentary
Sandstone with Iron Oxide Coating
Arenite (SiO2 with Fe2O3 impurities)
sedimentary
Citrine Quartz
Citrine (Silicon Dioxide - SiO2)
Mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Pumice
Pumice (Highly vesicular volcanic glass)
igneous
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
River Pebble
Siliceous rock fragment / Quartzite / Sandstone pebble
sedimentary
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite (composed of Quartz, Felspar, and Mica)
igneous
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Quartzite
Quartzite (SiO2)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
River Pebbles / Mudstone
Sedimentary Rock / Silty Claystone
sedimentary
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Granite, possibly granodiorite
Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende
igneous
Giallo Ornamental Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Quartz (Milky or Smoky Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Botswana Agate or Water-line Agate)
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Limestone with Lichen
Calcium Carbonate (CaCO3) with Endolithic/Epilithic Lichen
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Emerald in Host Rock
Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium
mineral
Dragon Vein Agate
Silicon Dioxide (SiO2)
mineral
Banded Slate
Slate (Metamorphosed Siltstone/Mudstone)
metamorphic
Sandstone
Arenite (SiO2 based typically)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
River Pebble (Greywacke / Basalt Pebble)
Indeterminate Rounded Pebble (composed of quartz, feldspar, or mafic minerals)
sedimentary
Beach Pebble (Nephrite Jade / Chalcedony)
Ca2(Mg,Fe)5Si8O22(OH)2 / SiO2
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Gemstone Tree Brooch (Agate and Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Faceted) / White Sapphire / Goshenite
Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)
gemstone
River Stone (Basalt or Siltstone)
Basalt (extrusive igneous rock) or fine-grained Siltstone
igneous
Blue Agate Geode Slice
Silicon Dioxide (SiO2) - Chalcedony variety
mineral