Industrial Byproduct (Anthropogenic Rock Like Material)

Sea Glass

Amorphous Silicon Dioxide (Man-made glass weathered by nature)

Vesicular Basalt (Lava Rock)

Basalt

Likely synthetic ruby (corundum)

Corundum (Al₂O₃), probably laboratory-grown

Puddingstone / orbicular jasper-like rock

Likely orbicular rhyolite or altered volcanic breccia, composed mainly of quartz, feldspar, and iron-bearing alteration minerals

Prasiolite (Green Quartz) / Sea Glass Amalgam

SiO2 (Silicon Dioxide)

Small rounded pebble, likely quartz-rich river or beach stone

Unidentified lithic pebble; exact rock type cannot be determined from the image

Sea Glass

Man-made silicate glass

Rounded gray river pebble, likely basalt or andesite

Fine-grained mafic volcanic rock; commonly basalt (plagioclase, pyroxene, and possible olivine)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Dalmatian jasper (polished stone beads)

Commercial “Dalmatian jasper”; typically a feldspar-rich rock with dark aegirine or arfvedsonite inclusions, not true jasper

Schist (Greenschist / Mica Schist)

Metamorphic rock rich in platy minerals (e.g., Chlorite/Mica schist)

Quartzite

Quartzite (principally SiO2)

Polished brecciated jasper

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Diamond (or Diamond Simulant)

Carbon (C)

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Possible basaltic volcanic rock or iron-rich meteorite

Likely basalt (plagioclase–pyroxene rock); meteorite status cannot be confirmed visually

Likely iron meteorite (stony-iron or weathered iron-rich meteorite)

Provisional identification: meteoritic Fe–Ni alloy, mainly kamacite/taenite; exact classification requires chemical and petrographic testing

Serpentine

Serpentine subgroup (Mg,Fe)3Si2O5(OH)4

Smooth gray pebbles

Unidentified rounded rock fragments; composition cannot be determined from the image

Titanium Aura Quartz (Bismuth-coated Druzy)

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Possible iron-rich basalt or slag-like volcanic rock

Basalt, tentatively; mineral composition likely plagioclase, pyroxene, and iron oxides

Tumbled tree agate (dendritic agate)

Cryptocrystalline quartz, SiO₂, with manganese/iron-oxide dendrites

Red Sandstone

Clastic Sandstone (typically Quartz-rich with Iron Oxide)

Sandstone

Arenite (SiO2 based with quartz grains)

Coal

Combustible sedimentary rock

Polished ocean jasper

Orbicular jasper (microcrystalline quartz, SiO₂)

Graphite-veined Quartzite

Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)

Shale or Siltstone

Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)

Bauxite

Bauxite (Al2O3·2H2O)

Quartz Pebble

Silicon dioxide (SiO2)

Iron-rich meteorite candidate

Provisional: stony-iron or iron meteorite; exact classification requires testing

Iron-stained quartz-rich breccia

Silicified, limonite/goethite-stained breccia; chiefly SiO₂ (quartz) with FeO(OH)·nH₂O iron oxides

Basalt

Basalt (Ma-Fe Silicate)

Likely garnet-bearing schist or weathered garnet amphibolite

Garnet (almandine, Fe₃Al₂Si₃O₁₂) in a mica-rich metamorphic matrix

Chert (specifically Flint or Dark Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Amethyst-bearing quartz cluster

Quartz, SiO₂; purple coloration commonly from iron-related defects and irradiation

Likely brown mica (biotite) specimen

Biotite, a potassium-iron-magnesium sheet silicate; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)

Banded chert or silicified limestone nodule

Microcrystalline quartz (SiO₂), possibly replacing carbonate fossils

Green glassy slag (often sold as “sea glass” or “green obsidian”)

Industrial vitreous slag; primarily amorphous silicate glass, composition variable

Sandstone

Sedimentary Rock (Quartz arenite)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass