Man Made Composite (Lithified Equivalent Of Sedimentary)

Schist (Kyanite Schist)

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

Stromatolite

Biogenic Sedimentary Rock (Lithified microbial mat)

Fossiliferous limestone

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

Fossilized Shell or Coral Fragment in Matrix

Invertebrate Fossil in Sedimentary Rock

Sandstone

Sandstone (lithified arenite/wacke)

Rhyolite

Rhyolite (Extrusive Igneous Rock)

Rounded sandstone pebble

Quartz-rich sandstone; exact composition cannot be confirmed from the image

Chert (chalcedony)

Microcrystalline quartz, SiO₂

Rounded river cobble, likely weathered sandstone or siltstone

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

Limestone

Calcium Carbonate (CaCO3)

Geode (Quartz / Chalcedony Geode)

SiO2 (Silicon Dioxide)

Polished blue calcite sphere (tentative identification)

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

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica

Yellow jasper (likely iron-stained chalcedony)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides

Chert (possibly a worked stone flake)

Microcrystalline quartz, SiO₂

Sandstone

Arenite (typically composed of SiO2)

Likely porphyritic igneous rock (possibly granite or rhyolite)

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

Fossiliferous limestone

Calcite-rich bioclastic limestone (mostly calcium carbonate, CaCO₃)

Asphalt aggregate pavement

Bituminous asphalt concrete containing crushed stone aggregate

Conglomerate

Conglomerate (lithified rudite)

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

Fossil-bearing sedimentary rock, likely with a fossil shell or ammonite cross-section

Fossiliferous limestone or calcareous mudstone; fossil identity is uncertain from the image

Pebble

Lithified rock fragment

Common Pebble / Sedimentary Rock Fragment

Lithified clastic sediment

River Pebble

Lithified clastic sediment

Likely graphite-rich schist or graphite-bearing metamorphic rock

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

Chert (containing Iron Oxide spots)

Microcrystalline Quartz (SiO2)

Cardstock (Paper)

Cellulose (C6H10O5)n

Quartzite / Sandstone / Chert Mix

Silicon Dioxide (SiO2)

Weathered iron-rich metamorphic rock, possibly schist or metabasalt

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

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

Biotite granite (weathered granitic rock)

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

Rounded fossiliferous limestone or weathered limestone nodule

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

Weathered quartz-rich sandstone (likely ferruginous sandstone)

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

Weathered fossiliferous limestone pebble

Calcite-rich limestone (primarily CaCO₃); exact fossil content is unclear from the image

Iron-stained quartz-rich rock, possibly weathered sandstone

Quartz-rich sandstone with limonite/goethite staining; exact identification requires testing

Polished pietersite-like brecciated jasper

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