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

Polished brecciated jasper

Jasper, opaque microcrystalline quartz (SiO₂), with iron-oxide and other mineral inclusions

Polished blue stone, likely sodalite or dyed agate

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

Asphalt concrete

Anthropogenic conglomerate

Slag Glass (Leland Blue variant)

Anthropogenic Vitreous Silicate

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Yellow jasper or polished yellow chalcedony

Microcrystalline quartz, SiO₂, likely iron-stained jasper/chalcedony

Banded Calcite (often sold as 'Mexican Onyx')

Calcite (Calcium Carbonate - CaCO3)

Carnelian Agate Beads

Silicon Dioxide (SiO2)

Rounded basalt pebble

Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine

Chert (specifically Yellow Jasper variety)

Silicon Dioxide (SiO2)

Shiva Lingam (Polished Jasper)

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Goldstone

Not a natural mineral or rock. It is an ornamental glass.

Chert (Green Fossilized Algae or Jasper)

Silicon Dioxide (SiO2)

Brecciated Jasper

Brecciated Jasper (Microcrystalline Quartz / SiO2)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Red Jasper (Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled yellow jasper or serpentine

Jasper: microcrystalline quartz (SiO₂); possible serpentine: Mg₃Si₂O₅(OH)₄

Possible tektite or volcanic glass specimen

Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Copper-bearing schist (likely bornite/chalcopyrite ore)

Micaceous schist with sulfide minerals, chiefly bornite (Cu₅FeS₄) and/or chalcopyrite (CuFeS₂)

Red Jasper (Quartz)

SiO2 (Silicon Dioxide with Iron Oxide inclusions)

Red Jasper

Silicon Dioxide with iron impurities (Quartz variety, SiO2)

Tumbled chalcopyrite (likely)

Chalcopyrite, CuFeS₂

Basalt pebble

Basalt; primarily plagioclase feldspar, pyroxene, and often olivine

Chalcedony (River Pebble)

Silicon Dioxide (SiO2)

Smoky quartz

Quartz, silicon dioxide (SiO₂), smoky variety

Jasper with Hematite

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

River Jasper (Green Jasper)

Silicon Dioxide (SiO2) with impurities

Tumbled green jasper (probable serpentine-rich stone)

Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite

Blue Dyed Agate Geode Slice

Chalcedony (Silicon Dioxide, SiO2) with artificial cobalt/iron-based dye

Dyed Blue Agate (Slab)

Agate (Variety of Chalcedony/Microcrystalline Quartz), SiO2

Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Tumbled blue stone, likely blue aventurine or dyed quartzite

Quartz (SiO₂), likely with inclusions or artificial dye; exact identification requires testing

Picture Jasper

Impure variety of silica (SiO2)

Beach Agate / Jasper Pebble

Cryptocrystalline Quartz (SiO2)

Heat-Treated Citrine (Amethyst Cathedral with Agate inclusions)

Silicon Dioxide (SiO2) with iron impurities

Dalmatian jasper

Dalmatian stone, typically a leucocratic alkali-feldspar-rich porphyritic igneous rock with black arfvedsonite or aegirine inclusions

Chert (Yellow Jasper)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Shiva Lingam Stone

Cryptocrystalline Quartz (Jasper/Basalt matrix)