Sedimentary (Man Made Conglomerate)

Hag Stone

Perforated Quartz Pebble / Sedimentary Rock

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

Quartz (Gravel Pebble)

Silicon Dioxide (SiO2)

River Pebble (Gravel Pebble)

Stream-rounded Rock / Siliciclastic Pebble

Black Beach Pebble (Basalt / Slate Pebble)

Rounded Fine-Grained Clastic / Igneous Rock Pebble

Common River Pebbles and Stones

Mixed natural stream gravel / siliciclastic pebbles

Unidentified small rocks or gravel

Gravel and River Pebbles

Unconsolidated rock fragments / Detrital sediment

Gravel and Pebbles

Unconsolidated rock fragments / detrital sediment

Puddingstone (Jasper Conglomerate)

Jasper Conglomerate (SiO2 matrix with Fe2O3 inclusions)

Conglomeratic aggregate / pebble-rich concrete-like rock

Polymictic conglomerate (likely glacial or beach-derived gravel matrix); exact identification uncertain from image

River Pebble (Gravel)

Rounded clastic sediment

Puddingstone (Jasper-Conglomerate)

Jasper Conglomerate (SiO2 matrix with Jasper clasts)

Puddingstone (Gowganda)

Jasper-clast Polymictic Conglomerate (Gowganda Formation)

River Gravel

Polymictic Gravel / Detrital Rock Aggregate

Gravel and Pebbles

Unconsolidated rock fragments (clastic sediment)

River Pebble (Granite / Sandstone Cobble)

Stream-rounded Rock Pebble

Grey River Pebble (Greywacke / Basalt)

Stream-rounded silicate rock pebble

River Pebble (Gravel)

Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)

Weathered polymictic conglomerate or breccia

Polymictic conglomerate/breccia, likely iron-stained and quartz-bearing

Puddingstone / polymictic conglomerate

Polymictic conglomerate, chiefly quartz, feldspar, and lithic clasts in a silica-rich or carbonate cement

Puddingstone (Quartzite Conglomerate with Jasper inclusions)

Metaconglomerate (Silicon Dioxide, SiO2)

Conglomeratic sandstone or breccia

Lithic arkose / polymictic conglomeratic sandstone

Coquina or Fossiliferous Conglomerate

Bioclastic Rudstone (variable composition)

Mixed river gravel (alluvial conglomeratic sediment)

Polymictic alluvium; composition includes quartz, feldspar, chert, granite, basalt, and metamorphic rock fragments

Chalcedony Nodule in Matrix

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered conglomeratic breccia

Polymictic conglomerate/breccia, likely iron-stained

Jasper and Quartzite Breccia

Silicified sedimentary breccia

Breccia

Clastic Breccia (SiO2/CaCO3 dominated)

Chert Conglomerate (or Breccia)

Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)

Weathered polymictic gravel/conglomeratic rock

Polymictic conglomerate or poorly lithified alluvial gravel; chiefly quartz, feldspar, mica, and dark lithic fragments

Chert / Flint Conglomerate

Silicified Sedimentary Breccia (primarily SiO2)

Jasper and Chert Conglomerate

Ferruginous Microcrystalline Quartz (SiO2)

Jasper Conglomerate (Puddingstone)

Jasper Conglomerate (SiO2 matrix with quartz/jasper clasts)

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

Quartz-bearing polymictic conglomerate

Conglomerate with milky quartz clasts; composition may include quartzite and weathered feldspathic/mafic rock fragments

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

Mixed River Pebbles and Rock Collection

Polymictic lithic conglomerate, sandstone, and quartz pebbles

Quartz Pebble

Silicon Dioxide (SiO2)

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)