Weathered gneiss
Banded gneiss, commonly composed of quartz, feldspar, and mica
metamorphic
Category
Metamorphic Rock (Specifically A Rock Composed Of Minerals)
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Granite
Felsic intrusive igneous rock
igneous
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic
Greenstone
Greenschist (composed of chlorite, actinolite, and epidote)
metamorphic
Emerald in Matrix (Quartz/Schist)
Beryl (Be₃Al₂Si₆O₁₈) with Chromium/Vanadium impurities
mineral
Quartzite (specifically an iron-stained or Carnelian-colored variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Dalmatian Jasper
Peralkaline Feldspar Diorite/Rhyolite
igneous
Bauxite
Aluminum ore (mixture of gibbsite Al(OH)3, boehmite γ-AlO(OH), and diaspore α-AlO(OH))
sedimentary
Eclogite
Eclogite (composed primarily of Omphacite and Garnet)
metamorphic
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)
Metamorphic Rock
Botryoidal Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Epidosite with Quartz (Unakite-variant or Jasper)
Epidotized Metasomatite
metamorphic
Granite Pebbles
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Quartz-Veined Slate or Greenstone
Metamorphic rock with quartz vein (SiO2)
metamorphic
Dalmatian Stone
Dalmatian Jasper (a trade name for an igneous microcrystalline rock composed mostly of feldspar, quartz, and dravite)
igneous
Diorite
Intermediate plutonic igneous rock
igneous
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Basalt
Extrusive Igneous Rock
igneous
Quartz (Agate/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Marble (White)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Unakite
Epidote-Feldspar rock
Metamorphic Rock
Granite (Polished Countertop Surface)
Plutonic Igneous Rock (Felsic)
igneous
Granite
Granite (Plutonic Igneous Rock)
igneous
Granite
Intrusive Igneous Rock
igneous
Dalmatian Stone and Lapis Lazuli
Dalmatian Stone (peralkaline rock) with Lapis Lazuli (metamorphic rock)
igneous
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Pink Granite
Felsic intrusive igneous rock
igneous
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Serpentinite (Serpentine Rock)
Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.
Metamorphic
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Not a geological specimen
N/A (man-made object)
N/A
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Ventifact
Eolian Ventifact (often composed of basalt, chert, or quartzite)
sedimentary
Dalmatian Stone
Dalmatian Jasper (Aplitic Perthite)
igneous