Mineral, Possibly Rock Fragment Containing A Mineral

Sandstone (Red Sandstone)

Arenite

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sandstone (lithic/greywacke variety)

Arenite (composed primarily of SiO2 with various lithic fragments)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Granite

Intrusive Igneous Rock

Fossiliferous Shale (with Vertebrate Bones)

Laminated Mudstone containing Fossilized Bone (Apatite)

Weathered quartz-rich rock fragment

Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image

Serpentine (dark specimen) with probable aquamarine/beryl fragment

Serpentine-group minerals, commonly antigorite or lizardite; pale fragment possibly beryl, Be₃Al₂Si₆O₁₈

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone (with vugs or solution cavities)

Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)

Granite Pebble

Intrusive Igneous Rock

River Pebble

Siliceous rock fragment

Quartz-rich breccia or vein quartz with dark inclusions

Milky quartz (SiO₂), likely brecciated and cemented with iron oxides and dark mica/amphibole minerals

Conglomerate

Conglomerate (clastic sedimentary rock)

Likely chlorite-bearing schist (possibly greenschist)

Chlorite–quartz–mica schist; commonly contains muscovite/biotite and feldspar

Granite Pegmatite

Pegmatite (Fulgite / Felsic Intrusive Rock)

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Weathered gray stone, possibly limestone or concrete-like carbonate rock

Tentatively micritic limestone (calcium carbonate, CaCO₃); exact identification is uncertain from the image

Unknown Tumbled Stone

Unknown (Too Blurry)

Banded Sandstone

Arenite (Sandstone with iron oxide banding)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Granite

Felsic intrusive igneous rock

Granite

Plutonic Igneous Rock

Sandstone

Arenite (SiO2 + various cementing minerals)

Sandstone with Magnetite and Iron Staining

Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)

Basaltic Tuff / Volcanic Breccia

Pyroclastic Breccia / Lithic Tuff

Sandstone (Ferruginous)

Arenite (Fe-rich)

Ferruginous Sandstone

Sandstone (rich in iron oxides/hydroxides)

Polished red jasper (likely brecciated jasper)

Jasper, microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

Sandstone

Arenite (composed primarily of SiO2)

Likely granite or granitic gneiss

Quartz–feldspar–mica aggregate; possibly foliated granitic gneiss

Amygdaloidal Basalt

Amygdaloidal Basalt

Weathered basalt (possibly iron-stained volcanic rock)

Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Pegmatite (Quartz, Feldspar, and Tourmaline/Biotite)

Pegmatitic Igneous Rock

Granite

Intrusive Igneous Rock (composed mainly of quartz, alkali feldspar, and plagioclase)

Red Tuff / Sandstone

Rhyolitic Tuff / Pyroclastic Volcanic Rock

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Possible tektite or dark volcanic rock fragment

Uncertain; likely natural silicate glass (tektite) or basalt

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartz-rich metamorphic rock, likely milky quartz or quartzite

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

Fossil coral fragment

Likely calcitic colonial coral, possibly fossilized scleractinian coral