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

Muscovite (Mica)

Muscovite - KAl2(AlSi3O10)(OH)2

Quartz–mica metamorphic rock, likely schist

Quartz–muscovite/biotite schist; predominantly SiO₂ quartz with phyllosilicate micas

Diorite

Diorite (intermediate intrusive igneous rock)

Mica / Muscovite or Biotite

Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)

Granite

Intrusive igneous felsic rock

Granite

Phaneritic Felsic Igneous Rock

Granite Cobble

Granite

Basalt Pebble

Basalt

Basalt with vesicles/amygdules

Basalt (containing volcanic glass and plagioclase)

Muscovite Mica (with Quartz)

Muscovite (KAl2(AlSi3O10)(OH)2)

River Pebble (Grey Quartzite / Sandstone Gravel)

Quartz-rich Sedimentary / Metamorphic River Pebble

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Milky Quartz with Mica (Gneiss/Schist influence)

Silicon Dioxide (SiO2) with Phyllosilicates

Aventurine

Quartzite (SiO2 with inclusions)

Granite Cobble

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

Dark mafic rock, likely basalt

Basalt (fine-grained assemblage chiefly plagioclase and pyroxene, commonly with olivine and iron oxides)

Basalt

Extrusive Igneous Rock

Basalt

Mafic Igneous Rock

Quartzite Pebble (River Rock)

Metamorphic Quartzite (SiO2)

Granite

Intrusive igneous felsic rock

Granite

Intrusive igneous felsic rock

Red Granite

Phaneritic Felsic Igneous Rock (Granite)

Porphyritic Andesite

Andesite

Biotite on Quartz

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

Basalt (River Pebble)

Basalt

Granite

Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)

Granodiorite

Granodiorite

Tumbled Yellow Quartz

Quartz (Silicon Dioxide, SiO2)

Basalt (with Iron Staining)

Mafic Igneous Rock

Basalt

Extrusive igneous rock

Basalt

Extrusive Igneous Rock

Granite Gravel / Pebbles

Granite (Plutonic Igneous Rock)

Porphyry

Porphyritic Igneous Rock

Ferruginous Quartzite (Red Quartzite)

Quartzite (primarily SiO2 with Fe2O3 inclusions)

Granite

Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)

Blue Quartzite (Dyed)

Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)

Clear quartz sphere or polished quartz cabochon (tentative)

Quartz, silicon dioxide (SiO₂); appearance may also be consistent with ordinary glass, which cannot be ruled out from the image alone

Epidote

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

Polished labradorite (likely)

Labradorite, a plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Quartzite River Cobble

Quartzite (primarily SiO2)

Basalt

Extrusive Igneous Rock

Granite

Granite (Felsic Plutonic Rock)