Pink agate (likely dyed or coated)
Microcrystalline quartz, SiO₂ (chalcedony/agate)
mineral
Category
Not A Natural Rock (Man Made Composite)
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Green Aventurine and Clear Quartz
Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)
Mineral
Gravel and Pavement Aggregates
Unconsolidated rock fragments / detrital sediments
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone Pebble
Sedimentary Rock (CaCO3)
sedimentary
Mixed collection of natural stones
Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks
igneous, metamorphic, sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
gemstone
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Granite cobble
Granite; chiefly quartz (SiO₂), feldspar, and mica/amphibole
igneous
Sandstone (Sedimentary Rock)
Arenite (SiO2 based)
sedimentary
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - stained microcrystalline quartz
sedimentary
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Clay (as a rock-forming material)
Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)
Mineral
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Mixed rock and mineral collection
Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks
igneous, sedimentary, metamorphic, mineral
Pumice
Pumice (volcanic glass with vesicular texture)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Moldavite
Tektite (Silicates with aluminum, iron, manganese, and potassium oxide glass)
meteorite
Red Sandstone (Siltstone pebble)
Arenite / Siltstone (Silicon dioxide based with hematite impurities)
sedimentary
Blue Sapphire Crystal (Rough)
Corundum (Aluminum Oxide, Al2O3)
mineral
Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica/Amphibole)
igneous
Granite
Granite (Phaneritic Igneous Rock)
igneous
Milky and Citrine-type Quartz
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
mineral
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Tumbled jasper or chert
Microcrystalline quartz (SiO₂), possibly iron-bearing jasper
mineral
Granite
Phaneritic plutonic rock (dominated by SiO2, Al2O3, K2O, Na2O)
igneous
Dyed Agate Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Tumbled orange chalcedony (likely carnelian)
Microcrystalline quartz, SiO₂; iron-bearing variety commonly termed carnelian
mineral
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Granite (Felsic intrusive igneous rock)
igneous
Iron-rich laterite or limonite/goethite-bearing rock
Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O), likely in a lateritic matrix
mineral
Shungite (Noble/Type II)
Non-crystalline carbon (Fullerene-bearing carbonaceous rock)
metamorphic
Jasper Breccia
Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Shale
Fissile Mudrock (Clay-rich Sedimentary Rock)
sedimentary
Shale
Mudstone/Shale
sedimentary