Metamorphic Rock (Primarily Composed Of Minerals)

Unakite

Altered Granite (Granitic Metamorphic Rock)

Likely amphibolite

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

Gneiss (Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Fulgurite

Fulgurite (Lechatelierite), amorphous SiO2

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz: SiO2)

Soapstone

Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)

Quartz-rich metamorphic rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite composed predominantly of recrystallized quartz

Quartzite

Quartzite (composed primarily of Quartz, SiO2)

Serpentinite

Serpentinite, composed chiefly of serpentine-group minerals (e.g., antigorite, lizardite, chrysotile)

Greenstone (Greenschist facies)

Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)

Likely mica-rich schist

Mica schist, composed mainly of muscovite and/or biotite with quartz and feldspar

Greenschist

Greenschist (composed mainly of actinolite/tremolite, chlorite, and epidote)

Quartz Vein in Metamorphic Rock

Quartz-veined Schist or Gneiss

Weathered quartz-mica schist

Quartz–muscovite/biotite schist, locally iron-oxide stained

Sandstone (River Rock)

Arenite (composed primarily of SiO2)

Granitic Gneiss

Gneiss (Metamorphic Rock)

Unakite

Epidotized Granite

Weathered iron-stained quartzite or sandstone cobble

Quartzite (quartz-rich rock), possibly ferruginous sandstone

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.

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Mica-rich schist (probable)

Mica schist, composed mainly of mica minerals with quartz and possibly feldspar

Blue Apatite

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

Banded gneiss

Gneiss, commonly composed of quartz, feldspar, and mica/amphibole

Likely banded gneiss

Gneiss, a foliated metamorphic rock composed chiefly of quartz, feldspar, and mica

Granite (River Cobble)

Phaneritic Plutonic Felsic Rock (Granite)

Schist

Mica Schist (primarily composed of quartz, feldspar, and mica)

Sandstone

Arenite (mostly Quartz-based)

Green serpentine-rich rock (possibly serpentinite)

Serpentinite, composed chiefly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Granite Pebble

Granite (Phaneritic intrusive rock)

Granite

Granite (Felsic Plutonic Rock)

Ferruginous Sandstone (Gritstone)

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))

Weathered slate

Slate, a fine-grained metamorphic rock composed mainly of mica, chlorite, and quartz

Quartzite

Quartzite (composed primarily of Silicon Dioxide, SiO2)

Slate

Foliated Metamorphic Rock (composed mainly of clay minerals or micas)

Dalmatian Stone and Lapis Lazuli

Dalmatian Stone (Felsic Igneous Rock) with Lapis Lazuli

Banded gneiss pebble

Gneiss, a foliated metamorphic rock composed mainly of quartz, feldspar, and dark biotite or amphibole

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Basalt

Extrusive igneous rock primarily composed of plagioclase feldspar and pyroxene

Basalt

Mafic volcanic rock, primarily composed of Plagioclase, Pyroxene, and Olivine

Granite

Felsic intrusive igneous rock

Basalt

Basalt (primarily composed of Plagioclase Feldspar and Pyroxene)