Not A Natural Rock (Man Made Composite)

Smoky Quartz (Faceted Beads)

Silicon Dioxide (SiO2)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Granite

Granite (Felsic Plutonic Rock)

Quartzite

Quartzite (primarily SiO2)

Basalt (Water-worn Pebble)

Basalt (Aphanitic Mafic Igneous Rock)

River Rock / Stream Pebble

Fluvial Clast / Rounded Sedimentary Particle

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Yellow Quartz (Chalcedony/Citrine Pebble)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Smoky Quartz

Silicon Dioxide (SiO2)

Amethyst

Amethyst (variety of Quartz, SiO2)

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Shiva Lingam

Cryptocrystalline Quartz (Jasperiod Silicate with Iron Oxide inclusions)

Emerald (Tumbled Beryl)

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities

Amethyst

Silicon Dioxide with iron impurities (SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Jasper)

Smoky Quartz (Tumbled)

Smoky Quartz (Silicon Dioxide - SiO2)

Coquina / Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate - CaCO3)

Sandstone

Arenite (primarily SiO2)

Puddingstone (Jasper Conglomerate)

Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Sandstone

Quartz Sandstone (predominantly)

Quartz (specifically Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Diabase (Greenstone)

Diabase (Dolerite)

Smoky Quartz

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with impurities of iron)

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Agate

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone

Arenite (SiO2 + various cementing minerals)

Ferruginous Sandstone

Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)

Obsidian (Black)

Obsidian (High-silica volcanic glass)

Limestone (with potential fossil inclusions)

Calcium Carbonate (CaCO3)

Ruby (in costume jewelry context)

Corundum (Al2O3) with Chromium impurities