Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Mineral And Metamorphic Rock
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Mixed collection of natural stones
Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks
igneous, metamorphic, sedimentary
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Serpentinite
Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, or Chrysotile)
metamorphic
Weathered granite or granitic pebble
Granite; chiefly quartz, feldspar, and mica
igneous
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
River Cobble (likely Metasedimentary)
Metasedimentary Rock / Quartz-rich Sandstone
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)
Metamorphic Rock
Unakite (Tumbled)
Unakite (altered granite)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
River Rock (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Serpentine
Serpentinite (group of minerals based on (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
White limestone or chalky carbonate rock
Calcite-rich limestone; possibly chalk (CaCO₃)
sedimentary
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Phyllite
Phyllite (Foliated metamorphic rock)
metamorphic
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
Mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe)3Si2O5(OH)4)
metamorphic
Greenschist
Chlorite Schist
metamorphic
Moss Agate
Silicon Dioxide (Chalcedony with green mineral inclusions), SiO2
gemstone
Greenstone / Serpentinite
Serpentinite (composed largely of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Mica Schist
Mica Schist (Composition typically includes Muscovite KAl2(AlSi3O10)(OH)2 and Quartz SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Aventurine (Green Quartz)
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Epidosite
Epidosite (Metasomatic calcium-aluminum silicate rock)
metamorphic
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Gneiss
Gneiss
metamorphic
African Turquoise (Jasper)
Quartz (SiO2) with impurities (Epidote/Amphibole)
metamorphic
Epidote
Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)
mineral
Mica Schist
Mica Schist (primarily Muscovite and Quartz composition)
metamorphic
Quartzite Pebble (River Rock)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Small rounded pebble, likely quartz-rich river stone
Indeterminate; likely quartz/chert-bearing lithic clast
sedimentary
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Weathered schist or phyllite
Mica schist/phyllite, likely quartz–mica-rich metamorphic rock
metamorphic