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

Polished picture jasper

Silicified microcrystalline quartz (chalcedony), commonly called picture jasper

Tumbled smoky quartz, possibly morion

Quartz (silicon dioxide, SiO₂), likely radiation-darkened smoky quartz

Tumbled brown chert or jasper

Microcrystalline quartz (SiO₂), likely chert/jasper

Polished brecciated jasper

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

Weathered metamorphic rock, likely schist or slate

Foliated pelitic metamorphic rock; commonly muscovite–chlorite schist or phyllite

Likely raw garnet crystal

Garnet-group silicate, probably almandine (Fe₃Al₂Si₃O₁₂)

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing hematite, goethite, and clay minerals

Red jasper (likely polished/tumbled)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Polished dark stone, likely basalt or slag-like volcanic rock

Probable fine-grained basalt (plagioclase–pyroxene; possibly glassy volcanic material)

Shiva Lingam Stone

Cryptocrystalline Quartz (Jasper/Basalt matrix)

Polished black stone, likely obsidian

Volcanic glass (approximately rhyolitic composition; mostly SiO₂)

Ferruginous Slag (Iron Smelting Byproduct)

Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)

Likely iron-rich laterite or limonite/goethite nodule

Hydrated iron oxides, chiefly limonite (FeO(OH)·nH₂O) and/or goethite (FeO(OH))

Polished brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Yellow jasper or iron-stained chert

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Shiva Lingam (Polished Jasper)

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Copper-bearing sulfide ore, likely chalcopyrite with iron oxides

Chalcopyrite (CuFeS₂), possibly associated with bornite (Cu₅FeS₄), pyrite, and limonite/goethite

Green Jasper

Microcrystalline Quartz (SiO2)

Serpentine-rich pebble

Serpentinite; chiefly serpentine-group minerals (chrysotile, lizardite, antigorite), commonly with magnetite and minor olivine/pyroxene

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely jasper/chalcedony

Tumbled jasper, likely brecciated or orbicular jasper

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

Tumbled red jasper

Jasper, microcrystalline quartz (SiO₂)

Breciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow jasper or polished yellow chalcedony

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

Likely weathered iron-rich concretion or jasper

Goethite/hematite-bearing chert or ferruginous concretion (identification uncertain from photograph)

Small metallic-looking mineral/rock fragment

Indeterminate from image; possibly galena, hematite, or metallic slag

Tumbled brecciated jasper (likely ocean jasper or red-and-gray jasper)

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

Possible iron-rich chert or slag-like rock

Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely jasper/chert; exact identification is uncertain from the photograph

Red Jasper

Silicon Dioxide with iron impurities (Quartz variety, SiO2)

Polished red jasper

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

Chalcedony (River Pebble)

Silicon Dioxide (SiO2)

Dyed blue quartz or druzy geode (likely)

Quartz, silicon dioxide (SiO₂), probably artificially colored

Iridescent bismuth crystal

Bismuth (Bi), artificially crystallized and likely oxidized/coated

Ferruginous Slag (Iron Smelting Byproduct)

Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)

Amethyst crystal point

Quartz, purple variety — silicon dioxide (SiO₂)

Dark volcanic rock, likely basalt

Basalt; primarily plagioclase feldspar, pyroxene, and often olivine

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Polished purple-and-cream jasper (likely)

Silica-rich microcrystalline quartz/chalcedony, SiO₂, colored by iron/manganese minerals

Picture Jasper

Silicified sedimentary or volcanic rock (primarily SiO2)

Black obsidian

Volcanic glass, predominantly rhyolitic silica (SiO₂-rich) composition