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

Jasper

Jasper (SiO2 plus impurities)

Green Slag Glass

Amorphous Silica Glass (Anthropogenic)

Red Zebra Jasper

Silicon dioxide with hematite impurities (SiO2)

Blue Obsidian

Volcanic Glass (SiO2 with inclusions)

Yellow chert or jasper pebble

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

Agate (Polished Slice)

Banded Chalcedony (SiO2)

Blue Dyed Agate

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Likely rough garnet-bearing metamorphic rock

Garnet schist or garnet amphibolite; reddish areas may be almandine garnet (Fe₃Al₂Si₃O₁₂)

Blue Dyed Agate Geode Slice

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

Green glassy slag or manufactured glass bead

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

Red jasper

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

Tumbled green stone, likely serpentine or green jasper

Probable serpentine-group mineral (Mg₃Si₂O₅(OH)₄) or microcrystalline quartz/chalcedony

Tumbled brown stone, likely chert or jasper

Microcrystalline quartz (SiO₂), probable chert/jasper

Polished jasper pebble

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

Tektite (specifically Indochinite)

Tektite (Natural silica glass)

Tumbled brecciated jasper

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

Jasper pebble

Silicon Dioxide (SiO2 with iron oxide inclusions)

Tumbled jasper, likely red/brown jasper

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

Red aventurine

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Iron-rich mineral specimen, possibly magnetite-rich ore

Possibly magnetite (Fe₃O₄), with associated iron oxides; identification is uncertain from the photograph

Stone Mosaic Mask

Composite silicate and carbonate minerals

Tumbled brown quartz/chert pebble

Microcrystalline quartz (SiO₂), possibly chert or jasper

Yellow Quartz (possibly dyed)

Silicon Dioxide (SiO2)

Picture Jasper

Silicon dioxide with iron oxide impurities (SiO2)

Agate (Dyed Blue)

SiO2 (Silicon Dioxide)

Tumbled red jasper

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

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely iron-stained jasper

Iron-stained quartz/chert pebble

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

Vesicular basalt (possibly scoriaceous basalt)

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

Tumbled green-blue glassy mineral, possibly fluorite or aventurine

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

Jasper (Chert)

Silicon Dioxide (SiO2)

Jasper with Hematite

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Red jasper pebble

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

Chert (Flint Nodule)

Silicon Dioxide (SiO2)

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

Orbicular jasper (orbicular chert/jasper)

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

Jasper

Jasper (Silicon Dioxide, SiO2 with iron oxide inclusions)

Riverstone Jasper

Silicon Dioxide (SiO2) with impurities

Green Jasper

Silicon Dioxide (SiO2) with iron and silicate inclusions

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

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

Conglomeratic gravel / polymictic breccia

Polymictic rudite, likely anthropogenic or beach/stream gravel; composition varies