Man Made Composite (Lithified Equivalent Of Sedimentary)

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

Pebble

Lithified rock fragment / Sedimentary clast

Blue glassy mineral specimen, possibly dyed or synthetic

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

Schist (Kyanite Schist)

Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)

Fossiliferous shale or mudstone with a brachiopod fossil

Likely a spiriferid brachiopod fossil in dark shale/mudstone; exact species and age require locality and examination

Fossiliferous limestone

Calcite-rich limestone (CaCO₃), containing possible shell or coral fragments

Fossilized Shell or Coral Fragment in Matrix

Invertebrate Fossil in Sedimentary Rock

Polished blue calcite sphere (tentative identification)

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

Limestone

Calcium Carbonate (CaCO3)

Rhyolite

Rhyolite (Extrusive Igneous Rock)

Rounded river cobble, likely weathered sandstone or siltstone

Quartz-rich clastic sedimentary rock; exact identification requires a fresh surface and testing

Geode (Quartz / Chalcedony Geode)

SiO2 (Silicon Dioxide)

Stromatolite

Biogenic Sedimentary Rock (Lithified microbial mat)

Likely porphyritic igneous rock (possibly granite or rhyolite)

Quartz–feldspar–mica aggregate; exact identification requires a fresh surface and tests

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica

Sandstone

Sandstone (lithified arenite/wacke)

Asphalt aggregate pavement

Bituminous asphalt concrete containing crushed stone aggregate

Likely graphite-rich schist or graphite-bearing metamorphic rock

Graphite (C) in a mica/quartz-rich matrix; exact rock name requires testing

Sandstone

Arenite (typically composed of SiO2)

Quartzite / Sandstone / Chert Mix

Silicon Dioxide (SiO2)

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

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Man-made Jewelry Charm (Enameled Metal)

Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Chert (containing Iron Oxide spots)

Microcrystalline Quartz (SiO2)

Polished pietersite-like brecciated jasper

Silicified chalcedony/jasper aggregate, primarily SiO₂; exact material uncertain from image

Conglomerate

Conglomerate (lithified rudite)

Weathered iron-rich metamorphic rock, possibly schist or metabasalt

Provisional identification: chlorite–quartz–feldspar schist or altered basalt; exact mineralogy requires testing

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating

Cardstock (Paper)

Cellulose (C6H10O5)n

Common Pebble / Sedimentary Rock Fragment

Lithified clastic sediment

River Pebble

Lithified clastic sediment

Biotite granite (weathered granitic rock)

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

Opal ring

Opal (hydrated amorphous silica, SiO₂·nH₂O)

Weathered quartz-rich sandstone (likely ferruginous sandstone)

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

Rounded fossiliferous limestone or weathered limestone nodule

Likely bioclastic limestone, composed mainly of calcite (CaCO₃); exact identification is limited by the blurry image

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Sandstone

Clastic sedimentary rock (primarily SiO2)

Tumbled river pebble, likely fine-grained sandstone or mudstone

Indeterminate lithic clast; possibly quartz-rich sandstone or siltstone