Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)

Sunstone

Oligoclase (Plagioclase Feldspar subclass), (Ca,Na)(Al,Si)4O8

Greenstone / Epidosite

Epidosite (primary minerals: Epidote and Quartz)

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium aluminum silicate hydroxide fluoride [KAl2(AlSi3O10)(F,OH)2]

Yellow Quartzite (River Stone)

Quartzite (composed primarily of Quartz: SiO2)

Biotite or Phlogopite Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Tumbled dark gray stone, likely basalt

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with olivine

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Dark gray stream-worn cobble, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly basalt (plagioclase ± pyroxene ± olivine)

Granite

Granite

Pink granite pebble

Granite, a felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Rounded granite pebble

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Likely river-worn granite or granitic pebble

Granite (quartz + feldspar + mica), identification from the image is tentative

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Rounded green-gray pebble, possibly serpentinite

Undetermined; appearance is consistent with serpentine-rich rock, but a photograph cannot confirm the mineral identification

Green Schist

Greenschist (composed of chlorite, epidote, and actinolite)

Serpentine (Serpentinite)

Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4

Muscovite Mica

Muscovite [KAl2(AlSi3O10)(OH)2]

Green Mica Schist

Mica Schist (Fuchsite or Chlorite variety)

Epidote

Epidote (Ca2(Al, Fe)3(SiO4)3(OH))

Weathered granite (likely biotite granite)

Granite; quartz–feldspar–biotite aggregate, with possible epidote or iron-oxide staining

Greenschist (Chlorite Schist)

Greenschist (containing Chlorite, Actinolite, and Epidote)

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Green Schist

Greenschist (Chlorite Schist)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Iolite (Cordierite)

Cordierite (Magnesium Aluminum Silicate), Mg2Al4Si5O18

Jasper

Silicon dioxide (SiO2) with impurities

Dalmatian Stone

Dalmatian Jasper (actually a Peralkaline Igneous Rock)

Tumbled quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Biotite Schist

Biotite Schist (Metamorphic Rock featuring K(Mg,Fe)3AlSi3O10(OH)2)

Graphite

Graphite (C)

Dark, fine-grained pebble (likely basalt)

Basalt; exact identification requires closer examination

Pink granite pebble

Granite, a coarse-grained felsic intrusive igneous rock, chiefly quartz, feldspar, and mica

Dark gray-green pebble, likely basalt

Fine-grained basalt (tentative; image alone cannot confirm composition)

Granite Pebble

Granite

Likely basaltic river cobble

Fine- to medium-grained mafic igneous rock, commonly basalt (plagioclase–pyroxene ± olivine)

Blue Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Muscovite Mica

Muscovite / KAl2(AlSi3O10)(OH)2

Chert (Yellow Jasper)

Cryptocrystalline Quartz (SiO2)

Schist

Schist (Crystalline Metamorphic Rock)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide), KAl2(AlSi3O10)(OH)2