Red jasper-bearing breccia (probable)
Microcrystalline quartz (SiO₂) with iron-oxide coloration, in a brecciated host
mineral
Category
Not A Rock (Synthetic Material)
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Unakite
Unakite (Metamorphosed granite)
metamorphic
Jasper and Basalt Pebble
Polymineralic lithic pebble
igneous and sedimentary
Thunder Egg (Agate Core)
Cryptocrystalline Quartz (SiO2) in Rhyolite/Perlite Matrix
mineral
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)
metamorphic
Fire Opal (in matrix)
Hydrated Silica (SiO2·nH2O)
Mineraloid
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Tumbled turquoise
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Banded Siltstone
Banded Siltstone / Laminated Siltstone
sedimentary
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Milky quartz vein rock
Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor mica or sulfide minerals
mineral
Weathered basaltic rock fragment
Basalt, likely porphyritic or amygdaloidal basalt with weathered iron-oxide-rich zones
igneous
Fossilized Coral (Petrified Coral)
Lithostrotionella (example genus) / Scleractinia
fossil
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
Conglomerate
Conglomerate
sedimentary
Sandstone
Sedimentary quartz arenite
sedimentary
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Basalt
Mafic Igneous Rock (Basalt)
igneous
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone/Quartzite
Sedimentary Rock (composed mainly of SiO2)
sedimentary
Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartz Pebble (Chalcedony/Chert)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Likely basalt with a pale mineral-filled vesicle
Vesicular basalt, probably containing calcite or zeolite (uncertain from image)
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Granite
Granite (Plutonic Igneous Rock)
igneous
Sandstone
Clastic sedimentary rock (Arenite)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary