Sedimentary (Man Made Conglomerate)

Brecciated jasper or brecciated chert

Silica-rich breccia, chiefly microcrystalline quartz (SiO₂), with iron-oxide staining

Breccia

Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)

River Pebble

Weathered Sedimentary Rock Fragment

Waterworn Pebble / Quartzite

Metamorphic/Sedimentary rock fragment

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Dyed or synthetic turquoise-blue glass-like specimen

Likely man-made colored glass or resin; exact identification requires testing

Blue goldstone

Man-made aventurine glass containing metallic copper particles; not a natural mineral

Likely polished quartz or glass-like mineral cabochon

Probably quartz (SiO₂), though the image cannot exclude man-made glass

Rounded brown-gray stone, possibly weathered conglomerate or sandstone

Indeterminate clastic sedimentary rock; likely poorly cemented sandstone/conglomerate

Polymict conglomerate with a projecting pebble

Conglomerate; clast-supported polymict conglomerate, dominated by quartz/feldspar and lithic fragments in a cemented matrix

Opalite (a synthetic glass, often confused with Opal)

Silicon dioxide glass (SiO2nH2O, for natural opal)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Pea Gravel / River Gravel

Unconsolidated Clastic Sedimentary Aggregate

Blue glassy mineral specimen, possibly dyed or synthetic

Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone or Weathered Conglomerate

Sedimentary Rock (Quartzose Sandstone / Lithic Arenite)

Quartz pebble

Silicon dioxide (SiO2)

River Gravel

Polymictic gravel and pebble aggregate

Conglomerate with rounded carbonate clasts

Polymictic carbonate conglomerate; clasts likely limestone or coral-derived calcite (CaCO₃)

Puddingstone (Jasper-Conglomerate)

Conglomerate (Silicon Dioxide, SiO2 with impurities)

Conglomerate (possibly breccia)

Polymictic clastic conglomerate; rounded clasts in a dark, likely volcanic-lithic matrix

Conglomeratic gravel / lithified alluvial deposit

Polymictic conglomerate or pebble-rich sandstone (likely weakly cemented)

Puddingstone (Gowganda Tillite/Jasper Conglomerate)

Jasper Conglomerate (SiO2 primary composition)

Asphalt (Bituminous pavement fragment)

Artificial conglomerate / Bitumen-Aggregate mixture

General Gravel (River Rock/River Stones)

Mixed Lithic Sediments (Conglomerate Clasts)

Rounded sedimentary pebble, likely limestone or calcareous sandstone

Indeterminate carbonate-rich clastic rock; possibly micritic limestone (predominantly CaCO₃)

Tumbled polymict breccia (probable quartz-rich breccia)

Clastic breccia composed mainly of quartz, feldspar, and iron-oxide-stained rock fragments

Chert Breccia

Brecciated Chert (Sedimentary Rock)

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Weathered conglomeratic river cobble

Polymictic conglomerate or breccia, likely matrix-supported

River Rock / Stream Pebble

Fluvial Clast / Rounded Sedimentary Particle

Chert nodule in sandstone or iron-stained host rock

Microcrystalline quartz (SiO₂), likely chert/flint

River Pebble (Granite/Sandstone Pebble)

Rounded Quartz/Feldspar Gravel Clast

Sedimentary Breccia

Clastic Breccia (CaCO3/SiO2 matrix)

Iron-stained breccia or weathered conglomerate pebble

Clastic sedimentary rock; likely quartz-rich sandstone/breccia with dark mafic or iron-manganese fragments

Quartz Breccia

Brecciated Quartz Clasts in Siliceous/Sandy Matrix

Hagstone (Adder Stone)

Chert or Sedimentary pebble with natural perforation

River Stone (River Pebble)

Rounded Sedimentary Rock (Lithic Clast)

Conglomerate (River Rock)

Clastic sedimentary rock (primarily SiO2)

Terrazzo (with Marble and Granite fragments)

Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates

Puddingstone (Jasper Conglomerate)

Quartzite Conglomerate (SiO2 matrix with Jasper/Quartz pebbles)

Puddingstone (Gowganda Conglomerate)

Polymictic Conglomerate (SiO2 matrix with jasper and quartz inclusions)