Industrial Byproduct (Anthropogenic Material)

Likely iron-rich concretion or weathered rock pebble

Uncertain from the image; possibly an iron-oxide-cemented concretion (goethite/hematite)

Diamond

Carbon (C)

Possible iron-rich pebble with a weathered inclusion

Unidentified; image alone does not support a reliable mineral or rock identification

Diamond (in Matrix)

Carbon (C)

Rough Diamond

Diamond (C)

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Opalite

Man-made glass (traditionally simulated Opal)

Diamond

Carbon (C)

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

Quartz-bearing pegmatitic rock, likely quartz–feldspar–mica specimen

Granitic pegmatite; primarily quartz (SiO₂), feldspar, and mica, with possible iron-oxide staining

Dark gray rock fragment

Indeterminate from image; possibly weathered basalt or fine-grained metamorphic rock

Red gemstone ring, possibly synthetic ruby or red glass

Unidentified red stone; ruby is corundum (Al₂O₃), but the image cannot confirm its identity

Diamond and Sapphire

Carbon (Diamond, C) and Aluminum Oxide (Sapphire, Al2O3)

Gemstone ring with dark blue cabochons

Likely blue sapphire (corundum, Al₂O₃); the stones cannot be identified confidently from the image

Tumbled quartz-rich pebble

Likely milky quartz with a dark mafic inclusion or attached basalt; exact identification requires testing

Likely polished or naturally smoothed pebble with a pale mineral patch

Undetermined; possibly a dark volcanic rock with a quartz or feldspar inclusion

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Quartzite

Quartzite (chiefly SiO2)

Basalt

Mafic Igneous Pebble

Gravel and Sediment Sample

Mixed clastic sediment

Diamond

Carbon (C)

Diamond

Carbon (C)

Polished bumblebee jasper (trade name)

Bumblebee jasper; a calcite–aragonite–gypsum-rich volcanic fumarole material, often with iron oxides and dark sulfides; not true jasper

Chert (Iron-stained)

Chert (SiO2)

Vesicular basalt (possibly scoriaceous basalt)

Vesicular basalt; chiefly plagioclase, pyroxene, and iron-rich oxides

Likely silicon carbide (carborundum)

Synthetic silicon carbide (SiC), likely blue-green crystalline grit

Anthracite coal (likely)

Anthracite; carbon-rich coal composed mainly of maceral vitrinite, with variable mineral impurities

Likely iron meteorite fragment

Iron–nickel meteorite, probably kamacite with taenite; identification is uncertain from the photo alone

Clear Quartz / Diamond (untested)

Silicon Dioxide (SiO2) or Carbon (C)

Polished dragon blood jasper

Jasper, a microcrystalline variety of quartz (SiO₂), colored by iron oxides and other inclusions

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Fossil shark tooth

Shark tooth fossil; likely a fossilized lamniform shark tooth, identification uncertain from the photo

Polished/tumbled rhodonite-rich stone

Rhodonite (MnSiO₃), likely mixed with quartz and manganese oxides

Quartzite

Metamorphic Quartzite (SiO2)

Likely beach-worn glass and a pebble

The brown piece appears to be weathered glass (amorphous SiO₂-rich material); the pale piece is likely a small quartz-rich stone, possibly milky quartz.

Polished tektite (likely indochinite)

Impact glass; natural silica-rich glass, approximately SiO₂ 70–80%

Unidentified pale green mineral fragment

Possibly serpentine, jade, or green quartz; image insufficient for confident identification

Polished mahogany obsidian (likely)

Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), with iron oxides

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based with quartz grains)

Diamond (set in jewelry)

Diamond (C)