Not A Rock (Man Made Origin)

Pumice

Pumice (Vesicular volcanic glass)

Basalt pebble

Basalt (Mafic Extrusive Igneous Rock)

Chert

Microcrystalline Quartz (SiO2)

Moldavite

Moldavite (Siliceous vitreous substance)

Milky quartz

Quartz (SiO₂)

Sandstone

Arenite

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Quartz (Grain)

Silicon Dioxide (SiO2)

Granodiorite

Phaneritic Plutonic Intermediate-Felsic Rock

Desert Rose (Gypsum Rose)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Uncertain pale granitoid or weathered feldspathic rock

Likely granite or granodiorite; chiefly quartz, feldspar, and minor mica, but the photograph is insufficient for precise identification.

Granite

Phaneritic plutonic igneous rock (SiO2-rich)

Likely green-brown jasper or iron-stained chert

Microcrystalline quartz (SiO₂), possibly iron-oxide-stained chert/jasper

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

Granite

Phaneritic plutonic rock (dominated by Quartz and Feldspar)

Porphyritic volcanic rock (likely basaltic andesite)

Porphyritic basaltic andesite; exact identification requires testing

Weathered quartz-rich rock fragment

Likely quartz–feldspar-rich granitoid, possibly granite or granitic gneiss; exact identification is uncertain from the image

Quartz Grain

Silicon Dioxide (SiO2)

Weathered quartz-rich rock, likely chert or quartzite

Microcrystalline quartz (SiO₂), possibly with iron-oxide staining

Iron-stained chert (possibly jasper)

Microcrystalline quartz (SiO₂), colored by iron oxides

Quartz Pebble (Beach Chalcedony)

Silicon Dioxide (SiO2)

Fluorite (Rainbow Fluorite)

Calcium Fluoride (CaF2)

Weathered fossiliferous limestone, likely coral or shell fragment

Calcite (CaCO₃), biogenic limestone; exact fossil taxon indeterminate from the image

Sandstone (Quartzose)

Arenite (primarily SiO2)

Milky quartz (probable)

Quartz, silicon dioxide (SiO₂)

Turquoise ring

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; the setting appears to be silver-colored metal

Likely quartz-rich rock (possibly milky quartz or quartzite)

Quartz-rich aggregate, predominantly silicon dioxide (SiO₂); exact identification is uncertain from the image

Small clear crystal, possibly quartz or glass-like gemstone

Uncertain; likely quartz (SiO₂), but the image is insufficient to exclude man-made glass or cubic zirconia

Sandstone

Arenite

Banded gneiss

Foliated quartz–feldspar gneiss, likely with mica

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Sedimentary Breccia

Clastic Breccia (CaCO3/SiO2 matrix)

Glauconitic Sandstone

Glauconitic arenite (contains (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Shatter Cone

Impactite (Shatter Cone texture)

Mixed rock collection

Labeled specimens appear to include iron-rich rock, schist, basalt, serpentinite, and shale

Quartz-rich pebble, likely milky quartz

Quartz (SiO₂), possibly weathered quartzite or chalcedony

Iron-rich rock fragment (possibly ironstone or limonite/goethite)

Likely ironstone composed largely of goethite/limonite; image alone cannot confirm

Likely pegmatitic granite or quartz-rich metamorphic rock

Granite/pegmatite, primarily quartz, feldspar, and mica

Polymictic conglomerate (possibly impact breccia)

Lithified polymictic conglomerate/breccia; clasts appear mainly mafic volcanic rock, with quartz- or feldspar-rich fragments in a dark matrix

Belemnoit (Fossil)

Belemnoidea (Order), Rostrum / Guard

Polished stone sphere, possibly agate or jasper

Likely microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image