Basalt (River Stone)
Extrusive mafic igneous rock
igneous
Category
Mineral Based Alloy (Anthropogenic)
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Vesicular Basalt
Extrusive Mafic Igneous Rock (Vesicular Basalt)
igneous
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Granite
Intrusive Phaneritic Felsic Igneous Rock
igneous
Coquina / Fossiliferous Limestone
Bioclastic Limestone (CaCO3)
sedimentary
Greenstone (Greenschist)
Greenschist facies rock (containing chlorite, epidote, actinolite)
metamorphic
Dyed Quartzite
Metamorphosed Quartz (SiO2) with synthetic pigment
metamorphic
Pink Granite
Intrusive Igneous Rock (high K-feldspar content)
igneous
Pink Granite
Phaneritic plutonic rock (Granite)
igneous
Sandstone (Grooved/Weathered)
Arenite (composed primarily of Quartz and Lithic fragments)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
sedimentary
Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Aquamarine with Sunstone
Aquamarine (Be3Al2Si6O18), Sunstone (Na,Ca)Al(Si,Al)Si2O8
Mineral
Fossil Coral (Favosites Honeycomb)
Favosites (Genus), Phylum Cnidaria, Class Anthozoa
sedimentary
Vesicular Basalt
Extrusive mafic igneous rock (Basalt)
igneous
Coquina or Fossiliferous Limestone
Fossiliferous Limstone (CaCO3)
sedimentary
Basalt
Basalt (Volcanic Mafic Rock)
igneous
Granodiorite
Granodiorite
igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Basalt
Basalt (primarily Plagioclase feldspar and Pyroxene)
igneous
Sandstone (Arkose)
Arkose Sandstone (principally SiO2 with Feldspar)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Crushed Stone (Likely Limestone or Granite)
Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite
sedimentary or igneous
Crushed Granite Gravel
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase Feldspar)
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Limestone Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Basalt (Fieldstone)
Basalt
igneous
Basalt
Basalt (composition of plagioclase feldspar and pyroxene)
Igneous
Basalt
Basalt
igneous
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Basalt
Basalt
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Basalt
Basalt (dominated by Plagioclase Feldspar and Pyroxene)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt (Water-worn Pebble)
Basalt
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Breccia
Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)
sedimentary