Basalt with Amygdaloidal Infilling
Porphyritic or Amygdaloidal Basalt
igneous
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
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Slag
Anthropogenic glassy silicate
Mineral-like byproduct
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Porphyritic Basalt
Porphyritic Basalt
igneous
Rhyolite Pebble
Rhyolite
igneous
Gneiss Pebble
Gneiss (High-grade metamorphic rock)
metamorphic
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
mineral
Golden Mica Schist
Mica Schist (primarily Muscovite/Biotite with Quartz)
metamorphic
River Pebble (Gneiss or Granite)
Metamorphic Rock (likely Gneiss or Granitic composition)
metamorphic
River Pebble (Gneiss / Granitic Schist)
Metamorphic Rock (Quartz-Feldspar-Mica assembly)
metamorphic
Vesicular Basalt (Scoria)
Aphanitic Mafic Igneous Rock with Vesicular Texture
igneous
Basalt Pebble
Extrusive mafic igneous rock
igneous
Quartz with Mica Schist (Pegmatite Specimen)
SiO2 (Silicon Dioxide) and Phyllosilicates (Biotite/Muscovite)
Igneous/Metamorphic Hybrid
Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Mixed polished river stones
Likely quartz, quartzite, chert/jasper, and possibly limestone or marble
mineral
Amethyst (Geode Fragment)
Silicon Dioxide with iron impurities (SiO2)
mineral
Smoky Quartz (Polished)
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt
Extrusive mafic igneous rock
igneous
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
sedimentary
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Yellow Quartz (possibly dyed)
Silicon Dioxide (SiO2)
mineral
Basalt (River Rock)
Basalt (Mafic volcanic rock)
igneous
Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)
Porphyritic Basalt
igneous
Basalt Pebble
Basalt (Mafic volcanic rock)
Igneous
Basalt River Pebble
Basalt (Mafic Extrusive Igneous Rock)
igneous
Quartz pebble (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Greenstone
Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote
metamorphic
Engineer Quartz/Quartzite
SiO2 (Silicon Dioxide with binders)
Sedimentary or metamorphic-derived
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sea Glass
Man-made vitreous material (silica-based glass)
mineral
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
River Cobble with Algae Patina
Weathered Chert or Quartzite pebble (SiO2 dominated)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
sedimentary
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Basalt (Vesicular)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Decorative polished pebbles
Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt
mineral
Slag (Industrial Glass)
Anthropogenic Amorphous Vitreous Silicate
mineraloid
Slag (Industrial Glass/Byproduct)
Anthropogenic Vitreous Silicate
igneous (anthropogenic)