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

Polished black stone sphere (likely black basalt or black tourmaline)

Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone

Dyed Agate / Ruby Quartz

SiO2 (Silicon Dioxide)

Polished sedimentary pebble, likely sandstone or quartzite

Quartz-rich sandstone (SiO₂-dominant), possibly weakly metamorphosed quartzite

Polished jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

Cullet (Slag Glass)

Amorphous Silica (Industrial byproduct)

Red aventurine

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Yellow chert or jasper pebble

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

Tumbled jasper or brecciated jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions

Red jasper

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

Orange Calcite point

Calcite (Calcium Carbonate, CaCO3)

Riverstone Jasper

Silicon Dioxide (SiO2) with impurities

Chert (Flint Nodule)

Silicon Dioxide (SiO2)

Iron-stained quartz/chert pebble

Microcrystalline quartz (SiO₂) with iron-oxide minerals, chiefly goethite/limonite

Tumbled blue-green stone, likely dyed agate

Agate (microcrystalline quartz, SiO₂); blue coloration may be artificial

Tumbled brown quartz/chert pebble

Microcrystalline quartz (SiO₂), possibly chert or jasper

Rounded quartz-rich pebbles, likely jasper/chert with one iron-stained specimen

Microcrystalline quartz (SiO₂), possibly jasper or chert; exact identification is uncertain from the image

Tumbled brecciated jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions

Jasper

Jasper (SiO2 plus impurities)

Vesicular basalt (possibly scoriaceous basalt)

Basalt; predominantly plagioclase feldspar, clinopyroxene, and Fe-Ti oxides, with possible olivine

Likely tumbled sandstone or limestone

Quartz-rich sandstone (possibly calcarenite/limestone)

Mixed polished/tumbled stones; likely blue calcite, red carnelian, and gray/blue quartz or agate

Probable calcite (CaCO₃), chalcedony/quartz (SiO₂), and iron-colored chalcedony

Tumbled smoky quartz

Quartz, silicon dioxide (SiO₂), smoky variety colored by irradiation-related defects

Jasper pebble

Silicon Dioxide (SiO2 with iron oxide inclusions)

Dyed Pink Agate (Crackled)

Silicon Dioxide (SiO2) - Chalcedony variety

Tumbled green-blue glassy mineral, possibly fluorite or aventurine

Uncertain from image; possible fluorite (CaF₂) or quartz aventurine (SiO₂)

Tumbled obsidian

Volcanic glass; chiefly silica-rich rhyolitic glass (approximately 70–80% SiO₂)

Tumbled yellow jasper or chert

Microcrystalline quartz (SiO₂), likely iron-oxide-stained chalcedony/chert

Green Slag Glass

Amorphous Silica Glass (Anthropogenic)

Chalcedony Pebble

Cryptocrystalline Quartz (SiO2)

Orbicular jasper (orbicular chert/jasper)

Silica-rich microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions

Ferrosilicon Slag (Industrial Vitrified Glass)

Vitreous Silicate Residue

Tumbled jasper, likely red/brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored chiefly by iron oxides

Blue Dyed Agate Geode Slice

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

Smoky Quartz

Silicon Dioxide (SiO2)

Peacock ore (bornite/chalcopyrite), likely treated

Bornite, Cu₅FeS₄, and/or chalcopyrite, CuFeS₂

Green Jasper

Silicon Dioxide (SiO2) with iron and silicate inclusions

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Bornite (“peacock ore”), likely weathered copper sulfide

Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish

Black obsidian

Volcanic glass, primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)

Jasper

Jasper (Silicon Dioxide, SiO2 with iron oxide inclusions)

Tumbled quartz pebble

Quartz, silicon dioxide (SiO₂), likely milky quartz