Mineral, Possibly Rock Fragment Containing A Mineral

Sandstone

Arenite

Likely quartz crystal fragment

Quartz (SiO₂), possibly a small tumbled or cleaved fragment

Likely weathered gray stone or chert fragment

Uncertain; possibly microcrystalline quartz (SiO₂)-rich chert

Iron-stained limestone or coral fragment

Calcite-rich carbonate rock; chiefly CaCO₃ (exact identification is uncertain from the image)

Sandstone

Arenite (SiO2 primarily)

Sandstone

Sandstone (composed predominantly of Quartz, SiO2)

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Conglomerate

Conglomerate rock

Black Beauty Meteorite

NWA 7034 (Northwest Africa 7034)

Quartz-rich rock, likely milky quartz vein material

Quartz (SiO₂), possibly iron-stained massive quartz with minor feldspar or mica

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Granite or Granodiorite (weathered fieldstone)

Granitoid

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Granite, possibly granodiorite

Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Rounded quartz-rich pebble

Likely microcrystalline quartz (SiO₂), possibly milky quartz or a pale quartzite fragment

Sandstone (likely Arkosic or Lithic Sandstone)

Arenite (SiO2 based with mineral inclusions)

Sandstone

Arenite (SiO2 principal)

Conglomerate

Conglomerate (a clastic sedimentary rock)

Basalt with Granite Inclusions (Xenolith)

Mafic Igneous Rock (Basalt) with Felsic Igneous Inclusion (Granite)

Weathered Sandstone with Algae Growth

Arenite

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Breccia Pebble

Sedimentary Breccia

Sandstone (Painted)

Arenite (primarily SiO2)

Fossiliferous limestone, likely coral or shell fragment

Calcitic limestone (primarily CaCO₃), containing preserved marine bioclasts

Mixed tumbled stone collection

Assorted minerals, likely including quartz, jasper, agate, and possibly obsidian or hematite

Sandstone with Iron Staining

Arenite with Limonite/Hematite inclusions (SiO2 + Fe2O3/FeO(OH))

Polished white chalcedony or milky quartz pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion

Shale fragment

Shale (Laminated Mudstone)

Blue-green copper mineral specimen, likely chrysocolla-bearing rock

Chrysocolla, hydrated copper phyllosilicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with malachite or chrysocolla matrix

Sedimentary Pebble

Sedimentary Rock Fragment

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite

Sandstone (Calcareous)

Clastic sedimentary rock (primarily SiO2 with CaCO3 cement)

Coprolite

Fossilized Feces

Granite

Intrusive Igneous Rock

Basalt with Vesicular Amygdule

Extrusive igneous rock (Mafic)

Sandstone (likely Greywacke variant)

Arenite

Quartz (Float/Abraded)

Quartz (SiO₂)