Gneiss with Quartz/Feldspar Vein
Felsic to intermediate gneiss
metamorphic
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
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Banded metamorphic pebble (possibly gneiss)
Likely banded gneiss; exact identification is uncertain from the photograph
metamorphic
Polished smoky quartz crystal with inclusions
Quartz, silicon dioxide (SiO₂), likely smoky quartz with iron-oxide or other mineral inclusions
mineral
Gneiss
Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)
metamorphic
Greenschist (or Serpentinite) with Quartz-Feldspar Vein
Metabasalt / Greenschist Facies Rock
metamorphic
Serafina (Serafinite / Clinochlore)
Clinochlore (Mg5Al)(AlSi3O10)(OH)8
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sapphire
Corundum (Al2O3)
mineral
Agate (Polished Sphere)
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Anthropogenic (Man-made)
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Banded Gneiss
Gneiss (Metamorphic rock of variable mineralogy, often quartz-feldspar base)
metamorphic
Polished, weathered stone pebble (likely granite or granitic rock)
Granite, a quartz–feldspar-rich intrusive igneous rock (tentative visual identification)
igneous
Labradorite
(Na,Ca)(Al,Si)4O8
mineral
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Mystic Topaz (Treated Quartz or Topaz)
Silicate Mineral (SiO2 or Al2SiO4(F,OH)2) with Titanium coating
gemstone
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Basalt Pebble
Extrusive Igneous Rock
igneous
Muscovite
Muscovite, KAl2(AlSi3O10)(OH)2
mineral
Mixed rock and mineral specimen collection
Multiple species, likely quartz (SiO₂), calcite (CaCO₃), feldspar, chert, and assorted volcanic/sedimentary rocks
mineral
Quartzite River Rock
Metaquartzite (majorly SiO2)
metamorphic
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Onyx (Calcite Onyx / Mexican Onyx)
Calcium Carbonate (CaCO3)
metamorphic
Coquina
Coquina Limestone
sedimentary
Muscovite on Quartz (Mica host rock)
KAl2(AlSi3O10)(OH)2 (Muscovite) in SiO2 (Quartz)
igneous/metamorphic
Granite Cobble
Granite (Porphyritic/Coarse-grained)
igneous
Likely basalt (possibly vesicular basalt)
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine, with iron-titanium oxides
igneous
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)
metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Slag (Industrial Glassy Byproduct)
Anthropogenic silicate byproduct (Slag)
Mineral-like byproduct (often mistaken for igneous rock or meteorite)
Rounded dark-gray rock, likely diorite or andesite
Probable diorite (plagioclase and hornblende/pyroxene); identification is limited by the image
igneous
Black beach pebble (likely basalt)
Basalt, a fine-grained volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine
igneous
Quartz Pebble (Beach Agate / Chalcedony Pebble)
Silicon Dioxide (SiO2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Polished green tumbled stone, likely serpentine
Serpentinite (rock composed chiefly of serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄)
metamorphic
Greenstone
Metabasalt / Chlorite Schist
metamorphic