Metamorphic Rock (Composed Of Multiple Minerals)

Granite fragment

Granite (Felsic intrusive igneous rock)

Likely serpentine-rich rock (serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile); exact identification is uncertain from the image alone

Mica-rich rock, likely mica schist

Mica schist, composed chiefly of muscovite and/or biotite with quartz and feldspar

Granite (likely weathered, coarse-grained granite)

Granite, composed chiefly of quartz, feldspar, and mica

Sandstone (specifically Lithic or Quartz Arenite)

Arenite (composed primarily of SiO2)

Quartzite

Quartzite (composed mainly of SiO2)

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Serpentinite

Serpentinite, composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)

Bauxite

Bauxite (Al2O3·2H2O)

Bauxite (Iron-stained Chert / Ironstone Aggregate)

Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

Granite

Intrusive Igneous Rock

Unakite / Epidotized Granite

Metamorphic Granite (Epidote-Orthoclase-Quartz Rock)

Likely gneiss pebble

Gneiss, a foliated metamorphic rock composed mainly of quartz, feldspar, and mica

Sandstone

Quartz Sandstone (predominantly)

Serpentinite

Serpentinite (composed primarily of minerals in the serpentine group: (Mg,Fe)3Si2O5(OH)4)

Sandstone

Arenite (Clastic Sedimentary Rock)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Red Sandstone

Ferruginous Sandstone (SiO2 with Fe2O3)

Shale / Mudstone

Laminated Mudrock (Siliciclastic Sedimentary Rock)

Bivalve Fossil (Fossilized Shell)

Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)

Dalmatian Stone

Dalmatian Stone (formerly called Dalmatian Jasper)

Sandstone (Quartz Sandstone / Iron-stained Sandstone)

Sandstone (SiO2 with iron oxide impurities)

Herkimer Diamond in Matrix

Quartz (SiO2) in Dolostone (CaMg(CO3)2)

Quartzite Cobble

Quartzite (primarily SiO2)

Unakite

Epidotized Granite

Serpentine Jade (New Jade/Olive Jade)

Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite

Quartz-rich rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂)

Quartzite

Metamorphic Rock (composed primarily of Quartz, SiO2)

Quartzite (River-worn)

Metamorphic rock predominantly composed of Quartz (SiO2)

Quartzite

Metamorphic rock primarily composed of Quartz (SiO2)

Quartzite Pebble

Metamorphic rock predominantly composed of Quartz (SiO2)

Quartzite

Metamorphic rock predominantly composed of Quartz (SiO2)

Red Quartzite River Stone

Metamorphic Rock (composed mainly of Quartz, SiO2)

Quartzite (Milky)

Metamorphic rock predominantly composed of Quartz (SiO2)

Yellow Quartzite Pebble

Metamorphic rock predominantly composed of Quartz (SiO2)

Granite Pebble

Granite

Blue-gray chalcedony (likely agate/jasper fragment)

Microcrystalline quartz, SiO₂ (chalcedony)

Sandstone

Arenite (SiO2 based)

Fine-grained gray-green rock, likely basaltic or volcanic stone

Probable basalt or microcrystalline mafic igneous rock; exact identification requires a fresh surface and testing

Sandstone (Quartzose Pebble)

Clastic Sedimentary Rock (Litharenite/Quartz arenite)

Greenstone / altered mafic rock

Likely chlorite–actinolite schist or metabasalt; exact identification requires testing