Industrial Byproduct (Anthropogenic Rock Like Material)

Tumbled brecciated jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with pale quartz/chalcedony veins

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Tumbled brown jasper (likely)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

Weathered quartz-bearing rock, possibly calcite vein fragment

Indeterminate; likely quartz (SiO₂) with carbonate minerals such as calcite (CaCO₃)

Uncertain fine-grained rock or mineral-bearing specimen

Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains

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

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Dalmatian jasper (often sold as Dalmatian stone)

Quartz- and feldspar-rich porphyritic volcanic rock; the trade name “Dalmatian jasper” is not a formal mineral species

Tumbled, iron-stained quartz-rich pebble

Likely quartz/chalcedony with iron-oxide staining; exact rock type cannot be determined from the image

Small pale stone (unidentified)

Undetermined; image detail is insufficient for reliable identification

Sea Shell Fragment (Calcium Carbonate)

Aragonite / Calcite (CaCO3)

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Tumbled quartz-rich pebble

Likely milky quartz with a dark mafic inclusion or attached basalt; exact identification requires testing

Iron-rich breccia or hematite-bearing jasper

Hematite–quartz jasper (silica-rich ironstone), possibly brecciated

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Tektite (likely indochinite)

Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium

Quartzite

Quartzite (primarily SiO2)

Silver (Morgan Dollar)

Native Silver (Ag) - 90% Silver, 10% Copper alloy

Basalt Pebble

Basalt (Mafic volcanic rock)

Quartz Geode

Silicon Dioxide (SiO2)

Pumice

Pumicite

Sandstone

Sandstone (SiO2-rich clastic sedimentary rock)

South Korean 100 Won Coin (Cupronickel)

Cupronickel Alloy (75% Cu, 25% Ni)

Synthetic Sapphire and Ion-X Glass

Single-crystal Alumina (Al2O3) and Ion-strengthened Aluminosilicate Glass

Mica-rich schist (likely biotite schist)

Biotite schist; quartz- and feldspar-bearing, with abundant mica

Limestone

Calcium Carbonate (CaCO3)

Rounded pebble, likely quartz-rich

Undetermined quartz-rich lithic pebble; exact rock type cannot be identified from the photograph

Uncertain small stone; possibly weathered quartz-bearing rock

Indeterminate from image; candidate materials include quartz-rich pebble or altered silicate rock

Greenish altered rock, possibly serpentinite or chlorite-rich schist

Tentative: serpentine-group minerals, chiefly antigorite/lizardite, or chlorite–actinolite assemblage

Diamond (or Diamond Simulant/Cubic Zirconia)

Carbon (C) - if diamond, or Zirconium dioxide (ZrO2) - if Cubic Zirconia

Quartz Pebble (Iron-Stained)

Crystalline Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 principal composition)

Granite Gravel (Pebble)

Intrusive Felsic Igneous Rock

Unidentified weathered mineral/rock fragment

Indeterminate; likely a weathered iron-rich silicate or sulfide-bearing specimen

Fossilized wood (petrified wood)

Silicified wood; commonly quartz/chalcedony (SiO₂) replacing wood tissue

Clam Fossil

Bivalvia fossil

Polished ocean jasper (orbicular jasper)

Microcrystalline quartz/chalcedony with iron- and manganese-bearing inclusions; SiO₂

Sandstone

Clastic Sedimentary Rock

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Concrete Paver (Artificial Cementitious Rock)

Hydrated Portland Cement Aggregate

Basalt (Weathered)

Extrusive Igneous Rock (Mafic composition)

Fossil-bearing limestone with a likely fossil shell

Bioclastic limestone, chiefly calcite (CaCO₃); fossil identity uncertain from the photo