Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Category
Not A Natural Rock
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Basalt (River Pebble)
Mafic volcanic rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Agate (specifically Botswana or Banded Agate variety)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Pink agate (likely dyed or coated)
Microcrystalline quartz, SiO₂ (chalcedony/agate)
mineral
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Citrine
SiO2 (Silicon Dioxide)
Mineral
Granite
Granite (Phaneritic Igneous Rock)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Polished orange agate/jasper cabochon
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration; exact variety uncertain
mineral
Diamond
Carbon (C)
gemstone
Citrine Geode Fragment
Citrine (Silicon Dioxide with Iron Impurities), SiO2
mineral
Blue slag glass or dyed glass-like industrial material
Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass
mineral
Jasper Breccia
Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Herkimer Diamond
Double-Terminated Quartz (SiO2)
mineral
Sandstone
Sandstone (lithified sand)
sedimentary
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Green Aventurine (Gua Sha tool)
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Gravel and Pavement Aggregates
Unconsolidated rock fragments / detrital sediments
sedimentary
Granite
Phaneritic Plutonic Felsic Rock (Granite)
igneous
Red Jasper
Silicon Dioxide with iron impurities (Quartz variety, SiO2)
sedimentary
Green Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Pink Granite
Phaneritic intrusive igneous rock (Granite)
igneous
Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
metamorphic
Moldavite
Tektite (Silicates with aluminum, iron, manganese, and potassium oxide glass)
meteorite
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt Pebble (River Rock / Beach Stone)
Basalt (fine-grained mafic igneous rock)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pink Granite
Granite (Phaneritic igneous rock rich in Alkali Feldspar)
igneous
Slag (Industrial Byproduct)
Anthropogenic Vitreous Silicate material
igneous
Granite
Felsic Plutonic Rock (Granite)
igneous
Granite
Intrusive Felsic Igneous Rock
igneous
Mottled gabbro or diorite pebble
Coarse-grained mafic/intermediate intrusive rock; chiefly plagioclase feldspar plus pyroxene, with possible amphibole or biotite
igneous
Amethyst (Faceted)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Tumbled tree agate (dendritic agate)
Cryptocrystalline quartz, SiO₂, with manganese/iron-oxide dendrites
mineral
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Red Sandstone
Sandstone (lithic arenite / ferruginous sandstone)
sedimentary