Not A Natural Rock (Man Made Composite)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Moldavite

SiO2 (+ Al2O3, FeO, K2O) - Natural Tektite Glass

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Sea Glass (Uranium/Vaseline Glass variant)

Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)

Dark river-worn cobble, possibly basalt or fine-grained volcanic rock

Likely basaltic rock; exact identification requires a fresh surface and tests

Weathered pegmatite or feldspar-rich granite fragment

Granitic pegmatite, composed mainly of potassium feldspar and quartz, with minor mica; exact identification is uncertain from the photograph

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Tumbled carnelian agate with dark mineral inclusions

Carnelian, an orange variety of microcrystalline quartz (chalcedony), SiO₂; dark inclusions are likely iron oxides/hydroxides, possibly hematite, goethite, or a basaltic/matrix fragment

Turquoise

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

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Gold Nugget

Native Gold (Au)

Clear Quartz (Crystal Quartz)

Silicon Dioxide (SiO2)

Dark rounded pebble, possibly basalt

Basalt (fine-grained mafic volcanic rock; identification tentative from photograph)

Chert (or Flint)

Chert (a cryptocrystalline variety of quartz, SiO2)

Pale green tumbled mineral fragment, likely serpentine or green calcite

Probable serpentine-group mineral (Mg3Si2O5(OH)4) or, less likely, calcite (CaCO3); identification is uncertain from the photograph

Prasiolite and Quartz Crystal Cluster

Quartz (SiO2); Prasiolite is a variety of Quartz

Tumbled blue quartzite or blue chalcedony (uncertain)

Quartz-rich rock; predominantly silicon dioxide (SiO₂)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Quartzite

Quartzite (SiO2)

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

Sea Glass (Kelly Green)

Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)

Synthetic Costume Glove (Paws)

Polyethylene terephthalate (Polyester) & Polyurethane blend

Weathered fossiliferous limestone fragment, possibly fossil coral or shell material

Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone

Rounded river cobble, likely basaltic volcanic rock

Fine-grained mafic igneous rock; likely basalt or andesite

Sandstone

Quartz Arenite (a type of sandstone composed of more than 90% quartz)

Coquina

Coquina (a type of limestone)

Diamond

Diamond (C)

Chert (Jasper Variant likely)

Silicon Dioxide (SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper aluminum phosphate)

Rounded basalt cobble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with minor olivine or magnetite

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Clear Quartz (Rock Crystal Fragments)

Silicon Dioxide (SiO2)

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Sandstone

Arenite or Sandstone

Shale (possibly)

Shale (fine-grained clastic sedimentary rock)

Smoky Quartz

SiO2 (Silicon Dioxide)

Laterite (iron-rich nodule, possibly Bauxite as a subtype)

Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)

Blue chalcedony cabochon (probable)

Chalcedony, cryptocrystalline quartz; silicon dioxide (SiO₂)

Fordite

Anthropogenic paint-rock