Sedimentary (If Natural Jasper) Or Artificial (If Slag)

Smoky Quartz (Chlorite Inclusions)

Silicon Dioxide (SiO2) with trace Aluminum and Natural Irradiation

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Polished dark stone, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine

Conglomerate (possibly breccia)

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

Weathered limestone or calcareous sandstone

Calcite-rich carbonate rock, predominantly CaCO₃; possibly fossiliferous limestone

Peacock Ore

Bornite (Cu5FeS4)

Likely weathered quartz-rich rock fragment

Uncertain; possibly quartz sandstone or a pale feldspathic rock

Chert (Yellow Jasper)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Tumbled brown chalcedony or jasper pebble

Microcrystalline quartz, SiO₂; possibly iron-rich jasper

Likely obsidian (possibly tektite or slag glass)

Volcanic glass; primarily SiO₂, noncrystalline

Native copper nugget

Native copper (Cu)

Asphalt concrete

Anthropogenic conglomerate

Chert (Green Fossilized Algae or Jasper)

Silicon Dioxide (SiO2)

Rounded dark river pebble, likely basalt

Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, commonly with minor olivine and iron oxides

Polished banded jasper (likely ocean jasper or brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities

Tumbled brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chert/jasper

Dark metallic-looking mineral specimen, possibly magnetite

Magnetite (Fe₃O₄), tentative identification

Polished/tumbled iron-rich jasper (likely brecciated jasper)

Jasper, microcrystalline quartz (SiO₂) colored chiefly by iron oxides/hydroxides

Banded chert (likely jasper/chert pebble)

Microcrystalline quartz, SiO₂, with iron-oxide and clay/mineral impurities

Unidentified rock fragments

Indeterminate; likely a weathered, iron-stained silicate rock

Gray sandstone or weathered volcanic rock

Likely quartz-rich sandstone; exact identification is uncertain from the image alone

Polished blue stone, likely sodalite or dyed agate

Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing

Polished black obsidian

Volcanic glass; predominantly rhyolitic silica (SiO₂), with minor iron, magnesium, and alkalis

Chert (specifically Yellow Jasper variety)

Silicon Dioxide (SiO2)

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Amethyst geode

Quartz, SiO₂; purple variety: amethyst

Likely native metallic mineral specimen

Uncertain from photograph; possibly pyrite (FeS₂) or a sulfide-rich metallic ore

Polished brecciated jasper (likely ocean jasper or red jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide hematite/goethite and dark volcanic or manganese-rich inclusions

Tumbled blue-green stone, likely chrysocolla or dyed chalcedony

Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony

Red jasper pebble

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

Polished banded chert or jasper

Microcrystalline quartz (SiO₂), likely iron- and manganese-stained chert/jasper

Carnelian Agate Beads

Silicon Dioxide (SiO2)

Basalt cobble

Mafic volcanic rock, chiefly plagioclase, pyroxene, and often olivine

Weathered limestone or calcareous concretion

Calcite-rich carbonate rock; chiefly calcium carbonate (CaCO₃)

Tumbled smoky quartz (probable)

Quartz, silicon dioxide (SiO₂), smoky variety

Smoky quartz crystal (tentative)

Quartz, silicon dioxide (SiO₂), likely smoky variety

Tumbled brown chalcedony (possibly carnelian or jasper)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony

Chalcopyrite (Peacock Ore)

Copper Iron Sulfide (CuFeS2)

Mixed polished gemstones and minerals

Likely agate/chalcedony (SiO₂), quartz, jasper, and possibly aventurine or obsidian; exact identification requires individual testing.

Rounded brown pebble

Indeterminate lithic clast; possibly weathered sandstone or iron-stained quartzite

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate - CaCO3)

Yellow chalcedony or citrine-like polished stone

Chalcedony (microcrystalline quartz, SiO₂), possibly dyed or artificially illuminated; exact identification is uncertain from the image