Sedimentary (Man Made Conglomerate)

Blue Sapphire (Synthetic or Man-made Glass Imitation)

Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

Metaconglomerate

Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Conglomerate (likely polymictic)

Polymictic conglomerate; a coarse clastic sedimentary rock containing lithic and mineral clasts

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble

Silicon dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)

Sandstone or possibly a conglomerate

Arenite (if sandstone)

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

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

Jasper-Quartz Conglomerate / Chert

Siliceous Sedimentary Rock (SiO2)

Conglomerate (possibly breccia)

Clastic sedimentary rock; chiefly quartz- and feldspar-rich clasts in a weathered iron-oxide cement

Common Gravel / Pebble

Lithified rock fragment / Detrital sediment

Breccia

Sedimentary Breccia

Conglomerate with Fossilized Shark Teeth

Clastic sedimentary rock (Conglomerate) containing Elasmobranchii remains

Pea Gravel / River Gravel

Unconsolidated Clastic Sedimentary Aggregate

Possible sea glass (naturally frosted glass), not a confirmed geological specimen

Man-made silicate glass; composition varies, commonly soda-lime glass

Blue glassy mineral specimen, possibly dyed or synthetic

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

Polygenetic Conglomerate (or Breccia)

Clastic Sedimentary Rock

Mixed Rock Collection (Pebbles and Stones)

Various geological specimens

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Gravel or Pebble

Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)

Quartz pebble in a coarse mineral-rich rock

Quartz (SiO₂), possibly in a quartz-rich conglomerate or breccia

River Pebble

Weathered Sedimentary Rock Fragment

Waterworn Pebble / Quartzite

Metamorphic/Sedimentary rock fragment

Rounded brown-gray stone, possibly weathered conglomerate or sandstone

Indeterminate clastic sedimentary rock; likely poorly cemented sandstone/conglomerate

River Gravel

Polymictic gravel and pebble aggregate

Conglomerate with iron-rich concretions

Polymictic conglomerate; concretions likely goethite/limonite-rich ironstone

Conglomerate (possibly breccia)

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

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (with inclusions / Sandstone fragment)

Silicon Dioxide (SiO2)

Rounded sedimentary pebble, likely limestone or calcareous sandstone

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

Weathered conglomerate pebble

Polymictic conglomerate, likely quartz- and feldspar-rich clasts in a cemented matrix