Metamorphic Rock (Primarily Composed Of Minerals)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Polished tiger’s-eye (likely iron-rich quartzite)

Quartzite composed mainly of SiO₂, with fibrous crocidolite pseudomorphs oxidized to iron oxides

Greenstone with Epidote or Quartz Vein

Epidiorite or Metabasalt (composed largely of Chlorite, Epidote, and Amphibole)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Ferruginous Sandstone

Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Granite

Granite

Schist (Greenschist / Mica Schist)

Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite (primarily SiO2)

Gneissic Granite

Granite Gneiss

Granite

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

Sandstone

Arenite (composed primarily of SiO2)

Rhyolite (Leopard Skin Jasper)

Rhyolite (Silicon Dioxide with impurities)

Graphic Granite (Zebra Rock)

Pegmatitic Granite (composed of Quartz and K-Feldspar)

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of clay-derived mica minerals and quartz

Sandstone

Clastic Sedimentary Rock

Sandstone (Water-worn pebble)

Sedimentary Rock (Quartz arenite)

Polished pegmatitic granite (likely graphic granite)

Coarse-grained granitic rock composed chiefly of quartz, feldspar, and biotite/hornblende

Quartz-veined Granite or Gneiss Pebble

Silicate-rich metamorphic rock fragment

Granite (Dioritic variant)

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Sandstone (Quartzose)

Arenite (SiO2 based)

Sandstone

Arenite (Clastic Sedimentary Rock)

Likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (chrysotile, lizardite, antigorite), commonly with magnetite and pyroxene remnants

Likely serpentinite (serpentine-rich rock)

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

Basalt

Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Serpentinite

Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, or Chrysotile)

Quartzite

Metamorphic Rock (composed mainly of SiO2)

Quartzite (River Cobble)

Metamorphic Rock (composed predominantly of SiO2)

Sandstone (Wonderstone)

Arenite (composed primarily of SiO2 with Fe2O3 impurities)

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Moonstone

Orthoclase Feldspar (composed of alternate layers of orthoclase and albite), (K,Na)AlSi3O8

Fossilized Horn Coral

Rugosa

Granite

Granite

Sandstone (Quartzite-leaning)

Arenite (primarily SiO2)

Banded Gneiss

Gneiss (Metamorphic Rock)

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Sandstone (Quartzose Sandstone)

Clastic sedimentary rock (SiO2 dominated)