Herkimer Diamond
Quartz (SiO2)
mineral
Category
Not A Natural Rock
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Dyed Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial dye
mineral
Wonderstone (Sandstone)
Liesegang Banded Sandstone (SiO2 dominated)
sedimentary
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
mineral
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Tumbled quartzite pebble
Quartzite; predominantly microcrystalline quartz (SiO₂)
metamorphic
Quartz Vein with Iron Staining
Silicon Dioxide (SiO2) with limonite/hematite staining
mineral
Cobblestones (Basalt/River Rock)
Polished lithic fragments and rounded pebbles
sedimentary
Blue Dyed Agate
Silicon Dioxide (SiO2)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Hag Stone
Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)
sedimentary
Quartz crystal pendant
Quartz (silicon dioxide, SiO₂), likely rock crystal or milky quartz
mineral
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Granitoid (Granite/Granodiorite)
Plutonic igneous rock (variable composition, primarily SiO2)
igneous
Picture Jasper
Silicified sedimentary or volcanic rock (primarily SiO2)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)
mineral
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Granite
Intrusive Felsic Igneous Rock (primarily Quartz and Feldspar)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
gemstone
Gold Nugget
Native Gold (Au)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities and natural irradiation
mineral
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Rounded river pebble
Indeterminate; likely quartz-rich sandstone, chert, or weathered volcanic rock
sedimentary
Slate
Low-grade Metamorphic Rock (composed of quartz, illite, chlorite)
metamorphic
Fossilized Echinoid / Sea Urchin Internal Mold
Echinoidea internal cast (steinkern)
fossil
Sandstone
Arenite (lithic or quartz sandstone)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 dominated with minor feldspar/clay)
sedimentary
Rough Emerald/Green Beryl
Beryl (Be3Al2(SiO3)6) with trace amounts of Chromium or Vanadium
mineral
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Quartz pebble
Silicon dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Granite (Felsic intrusive igneous rock)
igneous
Amethyst Lace Agate / Banded Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Polished brecciated jasper
Jasper, opaque microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions
gemstone
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Conglomerate
Clast-supported polymict conglomerate
sedimentary