Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Category
Not A Rock Or Mineral
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Likely bituminous coal
Coal, predominantly carbon-rich organic matter; rank and composition cannot be confirmed from the image
sedimentary
Sandstone with Lichen and Iron Oxide Staining
Quartz Arenite / Sandstone
sedimentary
Porphyritic basalt (likely porphyritic andesite)
Plagioclase-phyric volcanic rock; plagioclase phenocrysts in a dark, fine-grained groundmass
igneous
Unidentified rock fragments
Indeterminate; likely a weathered, iron-stained silicate rock
mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Sandstone (with Iron Staining)
Arenite (primarily SiO2 with Fe2O3/FeO(OH) oxides)
sedimentary
Likely beach-worn pebbles
Lithified rock fragments; exact rock type cannot be determined from the photo
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase
igneous
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Granite
Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granite
Intrusive Igneous Rock
igneous
Weathered greenstone (probable)
Chlorite–actinolite–epidote metamafic rock; exact identification requires testing
metamorphic
Iron-stained rock, likely limonite-rich weathered stone
Limonite (iron oxyhydroxides, chiefly goethite) coating or staining a rock of uncertain composition
sedimentary
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
mineral
Sandstone (Iron-stained)
Arenite with Limonite/Hematite staining
sedimentary
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Fossilized Brachiopod or Gastropod in Chert/Limestone
Phylum Brachiopoda / Mollusca
fossil
Rounded granitic pebble
Granite, a coarse-grained intrusive igneous rock composed mainly of quartz, feldspar, and minor mica or other dark minerals
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Sandstone (Micaceous)
Clastic Sedimentary Rock (primarily SiO2 with Mica)
sedimentary
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Green Slate
Metamorphic Pelite
metamorphic
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Rounded brown pebble
Unidentified lithic pebble; composition cannot be determined from the image
sedimentary
Likely gneiss (banded metamorphic rock)
Felsic-to-intermediate gneiss; exact mineral identification requires closer examination
metamorphic
Weathered, rounded rock (likely metamorphic or igneous)
Undetermined; possibly a quartz- and feldspar-bearing rock
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Gravel
Unconsolidated rock fragments / detrital sediment
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Tumbled yellow jasper (probable)
Jasper, an opaque microcrystalline variety of quartz; chiefly SiO₂ with iron-oxide inclusions
mineral
Greenstone pebble (likely altered basalt or serpentine)
Greenschist-facies mafic rock; commonly chlorite–actinolite–epidote ± serpentine
metamorphic
River Rock with Quartz Vein
Basalt or Andesite with Quartz Veining
igneous
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous