Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Dark, coarse-grained rock fragment (possibly amphibolite or gabbro)

Uncertain from the photo; likely amphibolite (hornblende-rich metamorphic rock) or a mafic igneous rock such as gabbro

Marble

Metamorphic rock primarily composed of Calcite (CaCO3)

Gneiss (specifically a Banded Gneiss pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Yellow chalcedony or quartz fragment

Microcrystalline quartz, SiO₂ (tentative; possibly iron-stained chalcedony)

Amphibolite

Amphibolite, composed mainly of amphibole and plagioclase feldspar

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Gneiss

Gneiss

Sandstone

Arenite (SiO2 primarily)

Serpentine

Serpentinite (group of minerals based on (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Granite (with Almandine Garnet inclusions)

Granite composed primarily of Quartz (SiO2), K-Feldspar (KAlSi3O8), and Almandine Garnet (Fe3Al2(SiO4)3)

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

Lapis Lazuli

Sodium aluminum silicate with sulfur (main component: Lazurite [(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2])

Lapis Lazuli

Lazurite-rich metamorphic rock (approx. (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Sandstone (Micaceous/Feldspathic variant)

Arenite (specifically subarkose or lithic arenite)

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Pink Granite

Granite (Phaneritic Quartz-Feldspar rock)

Gneiss (specifically a Granitic Gneiss)

Gneiss (Composition: Quartz, Feldspar, Mica)

Likely amphibolite

Amphibolite, composed mainly of hornblende and plagioclase feldspar

Quartzite

Quartzite (Metamorphic rock composed primarily of quartz)

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Sandstone (Ferruginous)

Arenite with Iron-Oxide cement

Likely amphibolite

Amphibolite, composed mainly of hornblende and plagioclase feldspar

Pink Granite

Granite (Phaneritic igneous rock)

Green Aventurine

Quartz with Fuchsite inclusions (SiO2)

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Granite / Gneiss (Felsic Metamorphic or Igneous Rock)

Gneiss (or weathered Granite)

Gneiss (specifically Epidote-Quartz Gneiss)

Gneiss containing Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) and Quartz (SiO2)

Gneiss (specifically Micaceous Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Blue Apatite

Apatite group (Ca5(PO4)3(F,Cl,OH))

Gneiss (specifically Pink Gneiss)

Gneiss (high-grade regional metamorphic rock)

Green Aventurine

Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions

Serpentine

Serpentine Group (Mg3Si2O5(OH)4)

Likely amphibolite

Amphibolite, composed mainly of hornblende (amphibole) and plagioclase feldspar

Sandstone (Ferruginous)

Arenite (Fe-rich)

Granite

Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Quartz-rich rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Likely milky quartz, possibly quartz-rich vein rock

Quartz (SiO₂); identification from the image is uncertain