Sedimentary Rock (Altered)

Generic Pebble

Lithic Fragment

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Epidote in Matrix (Unakite-like Rock Fragment)

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) / Altered Metamorphic Pebble

Aura Quartz Geodes (Lab-Altered)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition

Brachiopod Fossil

Phylum Brachiopoda

Sandstone

Arenite (SiO2 dominant)

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Limestone

Calcium Carbonate (CaCO3)

Quartz Geode

Quartz (Silicon Dioxide, SiO2)

Shale or Mudstone

Argillaceous sedimentary rock

Sandstone (with Rock Art)

Sandstone (Clastic Sedimentary Rock)

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Weathered sandstone fragment

Quartz-rich sandstone (compositionally uncertain)

Sandstone and Conglomerate pebbles

Sedimentary clastic rock

River Rock / Stream Pebble

Fluvial Clast / Rounded Sedimentary Particle

Weathered quartz-rich rock, likely quartzite or altered sandstone

Quartzite (mostly microcrystalline quartz, SiO₂); exact identification is uncertain from the photograph

Sandstone

Arenite (SiO2 dominant)

Sandstone

Arenite

Conglomerate Pebble (with Chert / Quartz)

Sedimentary Conglomerate / Breccia Pebble

Rounded weathered pebble

Likely fine-grained sandstone, siltstone, or weathered volcanic rock; exact identification is uncertain from the image

Unakite (often traded as Dragon Blood Jasper)

Epidotized Granite

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Quartz Geode

Silicon Dioxide (SiO2)

Leopard Skin Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Shale with Quartz Veins

Fissile Sedimentary Rock (SiO2)

Greenstone (Celadonite-bearing Volcanic)

Hydrothermally altered basalt or andesite with Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)

Unakite

Epidotized Granite

Sedimentary River Rock

Siliciclastic Sedimentary Rock (Quartzite or Sandstone pebble)

Sandstone (Painted)

Arenite (primarily SiO2)

Fine-grained mafic rock, likely basalt or altered basalt

Basalt; chiefly plagioclase feldspar and pyroxene, with possible chlorite/serpentine alteration

Sandstone Cobble with Iron Staining

Arenite with Limonite/Hematite staining

Chalcedony Geode

Silicon Dioxide (SiO2)

Fossiliferous Sedimentary Rock

Sedimentary Rock with Invertebrate Fossil Imprint

Sandstone (Garden Boulder)

Sandstone (SiO2 dominated)

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Sandstone Pebble

Sandstone (primarily SiO2)

Jade

Jade can refer to two distinct minerals: Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (Na(Al,Fe3+)Si2O6). Based on the image, showing a relatively uniform green color and possibly slight translucence in bead form, it is very likely one of these, but determining which one from a photo is difficult without specific testing.

Coal

Coal (Sedimentary Rock / Organic Rock)

Fossil Snail

Gastropoda fossil

Granite

Felsic intrusive igneous rock

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate