Man Made Composite (Lithified Equivalent Of Sedimentary)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Ferruginous)

Sandstone (mainly SiO2 with Fe2O3 staining)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Quartzite and Sandstone Pebbles

Silicon dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Brown Sandstone

Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)

Limestone (Flagstone)

Fossiliferous Limestone (CaCO3)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 inclusions)

Rose Quartz Carving

Quartum roseum (Variety of Quartz, SiO2)

Kambaba Jasper (Crocodile Jasper)

Stromatolite (Fossilized Algae)

Mookaite Jasper

Radiolarite (Silicified radiolarian chert), SiO2

Quartzite

Quartzite (SiO2 silicon dioxide)

Rhyolite

Rhyolite (High-silica volcanic rock)

Iron Meteorite (Candidate)

Iron Meteorite (Siderite)

Granite Cobble

Granite

Basalt

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

Rose Quartz (likely carved)

Rose Quartz (SiO2)

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-rich gneiss; exact identification requires a fresh surface and testing

Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)

Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining

Weathered quartz-rich stone, possibly chalcedony or calcite

Likely microcrystalline quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Diamond

Native Carbon (C)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone (with Limonite staining)

Arenite (FeOx-rich)

Sandstone (likely Graywacke or Lithic Sandstone)

Arenite / Wacke (SiO2 based with lithic fragments)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Sedimentary Calcite (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Fossiliferous Limestone

Calcite (CaCO3) Rich Bio-sedimentary Rock

Sandstone (River Cobble)

Arenite

Sandstone

Arenite

Limestone (with Iron-Oxide staining)

Sedimentary Calcium Carbonate (CaCO3)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Blue calcite (probable)

Calcite, calcium carbonate (CaCO₃)

Weathered sandstone or iron-stained sedimentary rock

Likely quartz-rich sandstone; exact identification is uncertain from the photograph

Granite

Granite

Pink Granite

Phaneritic Plutonic Igneous Rock (high K-feldspar content)

Granite and Igneous Mix

Phaneritic Felsic to Mafic Intrusive Rocks

Basalt

Basalt (Mafic volcanic rock)

Polished dark pebble, possibly basalt or chert

Uncertain; likely fine-grained basalt (plagioclase–pyroxene) or microcrystalline silica (chert)

Possible iron-rich chert or slag-like rock

Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image

Banded Sandstone

Clastic Sedimentary Sandstone