Sedimentary Rock (Possibly A Conglomerate Or Coarse Grained Sandstone)

Brecciated quartz-rich rock, possibly silicified breccia

Silica-rich breccia; chiefly microcrystalline quartz (SiO₂), with possible calcite and iron-oxide staining

Conglomerate

Conglomerate (SiO2 dominant in clasts)

Conglomerate

Clastic Sedimentary Conglomerate (SiO2, CaCO3, etc.)

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Conglomerate

Lithified, poorly sorted gravel; likely a carbonate-cemented conglomerate

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate

Conglomerate (SiO2 primary clasts with lithic matrix)

Conglomerate

Conglomerate (SiO2 matrix with various silicate clasts)

Granite (likely weathered granitic rock)

Granite; chiefly quartz (SiO₂), feldspar, and mica

Conglomerate

Conglomerate / Lithic Wacke

Conglomerate

Polymictic Conglomerate

Polymict conglomerate

Clastic conglomerate, likely polymictic pebble conglomerate

Puddingstone

Conglomerate

River Pebble (Siltstone / Fine-grained Sandstone)

Sedimentary Pebble (Siliclastic)

Conglomerate

Conglomerative Rudite (SiO2/CaCO3 matrix)

Conglomerate

Conglomerate

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Conglomerate (Puddingstone)

Conglomerate (specifically, clastic sedimentary rock)

Likely weathered sandstone or iron-rich conglomeratic fragment

Quartz-rich sandstone, possibly ferruginous sandstone (SiO₂-dominated)

Conglomerate

Polymictic clast-supported conglomerate

Conglomerate

Clastic sedimentary rock (Polymictic Conglomerate)

Puddingstone (specifically Gowganda Tillite or St. Joseph Island Puddingstone)

Jasper Conglomerate

Rounded gray sandstone or siltstone cobble

Lithified quartz–feldspar–clay sediment; exact petrographic identification requires testing

Conglomerate

Conglomerate (a clastic sedimentary rock)

Sandstone (likely Conglomerate or Gritstone)

Arenite (SiO2 based)

Sandstone (lithic wacke/conglomerate mix)

Clastic Sedimentary Rock (SiO2 with lithic fragments)

Quartz-rich conglomeratic rock (likely granitic breccia or conglomerate)

Uncertain; quartz–feldspar rock in a fine-grained matrix, possibly weathered granite or polymictic conglomerate

Mixed rock and mineral specimen collection

Mostly undetermined from the photograph; apparent quartz-rich rocks, sandstone, granite/gneiss, and possibly iron-oxide-bearing specimens

Weathered conglomeratic rock, likely iron-stained sandstone

Probable ferruginous, clast-bearing sandstone; exact identification requires examination of a fresh surface

Conglomerate

Conglomerate rock

Conglomerate

Conglomerate (a clastic sedimentary rock)

Iron-rich sandstone or weathered ironstone cobble

Ferruginous sandstone; primarily quartz (SiO₂) cemented or stained by iron oxides such as hematite and goethite

Puddingstone (specifically Michigan/Gowganda Puddingstone)

Conglomerate (Jasper Conglomerate)

Conglomerate

Conglomerate (Rock composed predominantly of rounded clasts > 2mm)

Conglomerate with Native Copper

Clastic Sedimentary Rock with Native Copper (Cu)

Conglomerate

Sedimentary Conglomerate

Conglomerate

Polymictic Conglomerate

Conglomerate

Sedimentary Conglomerate

Coquina or Fossiliferous Conglomerate

Bioclastic Rudstone (variable composition)

Weathered quartz-rich sandstone (likely ferruginous sandstone)

Quartz arenite to subarkose; mainly SiO₂ quartz with iron-oxide cement

Reddish sandstone or arkose

Quartz–feldspar siliciclastic sandstone; likely iron-oxide-stained arkose

Rounded river pebbles, likely basalt and sandstone/conglomerate

Probable basalt (dark specimen) and ferruginous sandstone or weathered conglomerate (tan specimen)