Granite
Phaneritic Igneous Rock (Granitic)
igneous
Category
Not A Natural Rock (Man Made Composite)
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Smoky Quartz with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
mineral
Amethyst (Variety of Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium
mineral
Sandstone (Quartzose Sandstone / Feldspathic Sandstone)
SiO2 with minor impurities (Fe2O3, KAlSi3O8)
sedimentary
Chert (Holey Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Polished carnelian-rich agate (likely polyhedral jasper/chalcedony)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Amygdaloidal Basalt
Basalt (Igneous Volcanic Rock with secondary mineral infilling)
igneous
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Epidote (Unakite component) / Green Quartzite
Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
sedimentary
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone (Quartz-rich)
Sandstone (SiO2 dominated)
sedimentary
Flint / Chert
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
sedimentary
Painted River Rock
Polished fluvial clast with acrylic/synthetic pigment coating
Sedimentary or Metamorphic (base substrate)
Snakeskin Agate
Cryptocrystalline Quartz (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous
Green Quartzite / Quartz Pebble
SiO2 (Silicon Dioxide with inclusions)
metamorphic
Sandstone (Graywacke type)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Weathered iron-rich rock, possibly limonite-bearing sandstone
Limonite/goethite mixture, approximately hydrated iron oxides (FeO(OH)·nH₂O), possibly coating sandstone or ironstone
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite
Felsic Plutonic Rock (Granite)
igneous
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Basalt
Basalt (extrusive volcanic rock)
igneous
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Agate
Silicon Dioxide (SiO2)
sedimentary
Beach Pebble / Agate-bearing Chert Pebble
Microcrystalline Quartz (SiO2) with Inclusion Minerals
sedimentary
Amethyst
Amethyst (SiO2 with Iron impurities)
mineral