Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Category
Not A Rock
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Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)
Granite / Quartz-Feldspar-Mica Aggregate
igneous
Sandstone with Desert Varnish
Arenite (SiO2 predominantly) with Ferromanganese coating
sedimentary
Gossan (with Limonite/Hematite coating)
Ferruginous Gossan (Fe2O3·nH2O / Fe2O3)
sedimentary
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Vesicular Basalt (or Scoria)
Mafic extrusive igneous rock with vesicles
igneous
Red Sandstone
Arenite (primarily quartz with iron oxide cement)
sedimentary
Generic Pebble
Lithic Fragment
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Granite
Granite
igneous
Quartz Vein in Amphibolite / Gneiss
Quartz (SiO2) in Mafic Metamorphic Host Rock
metamorphic
Copper Ore / Altered Granodiorite
Cupriferous rock with silicate gangue
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Basalt Pebble
Extrusive Igneous Rock
igneous
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Quartzite Pebble (Stream-rounded Quartz/Quartzite Gravel)
Quartzite / Silicon Dioxide (SiO2)
metamorphic
Vesicular Basalt (or Scoraceous Basalt)
Basalt (Vesicular texture)
igneous
Sandstone
Quartz Sandstone (predominantly)
Sedimentary
Granitic rock, likely weathered granite
Granite; primarily quartz, feldspar, and mica
igneous
Weathered granite or granitic gneiss
Granite; predominantly quartz, feldspar, and mica (exact identification is uncertain from the image)
igneous
Rounded quartz-veined pebble
Likely quartz-veined metamorphic rock; exact host rock is indeterminate from the image
metamorphic
Granite
Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)
igneous
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Porphyritic Basalt
Porphyritic Basalt with Plagioclase Phenocrysts
igneous
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)
metamorphic
K-Feldspar Granite Fragment
Felsic Plutonic Rock (Granite)
igneous
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Garnet Schist
Garnetiferous Micaceous Schist
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
River Pebble (Granite/Gneiss)
Granitic Pebble / Quartz-Feldspar Aggregate
igneous
River Pebble (Siltstone / Fine-grained Sandstone)
Sedimentary Pebble (Siliclastic)
sedimentary
Quartzite Pebble (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
metamorphic
Unidentified dark pebble
Unknown
rock
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Basalt (River Rock)
Basalt
igneous
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary