Industrial Byproduct (Anthropogenic Material)

Fossilized bivalve shell in limestone

Calcitic fossil shell; likely an oyster or other rudist/bivalve (Bivalvia), preserved in carbonate rock

Unidentified small tan stone

Likely quartz-rich pebble; exact identification is impossible from the image alone

Likely weathered quartz-bearing rock

Uncertain; possibly quartz-rich feldspathic material, with iron-oxide staining

Likely weathered quartz-rich rock fragment

Indeterminate; possibly quartz-bearing sandstone or chert with iron-oxide staining

Polished plume agate

Chalcedony (microcrystalline SiO₂) with iron-oxide inclusions

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Chert / Jasper

Silicon Dioxide (SiO2)

Rough Diamond

Diamond (C)

Orange fire opal jewelry

Precious opal, hydrated amorphous silica (SiO₂·nH₂O)

Likely metallic meteorite fragment

Unclassified iron-rich meteorite candidate; possible iron meteorite or stony-iron specimen

Blue-green tumbled mineral, likely amazonite

Amazonite (microcline feldspar), KAlSi₃O₈

Possible basaltic rock or meteorite candidate

Likely vesicular basalt; meteorite identification cannot be confirmed visually

Diamond

Native Carbon (C)

Diamond (or Cubic Zirconia simulant)

C (Carbon) or ZrO2 (Zirconium Dioxide)

Amethyst cluster

Amethyst, purple quartz (SiO₂)

Polished tiger iron (likely)

Tiger iron: banded quartzite composed mainly of quartz, hematite, and crocidolite/amphibole; visual identification is provisional

Sapphire

Corundum (Al2O3)

Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Basalt

Basalt (Volcanic Mafic Rock)

Small brown mineral fragment, possibly quartz/chert

Uncertain; likely microcrystalline quartz (SiO₂) or a weathered silicate rock

Rose quartz heart

Quartz, silicon dioxide (SiO₂), pink variety

Tumbled amethyst

Amethyst, purple quartz (SiO₂)

Weathered quartz-rich rock fragment

Indeterminate; likely quartz-bearing silicate rock

Polished ironstone concretion with quartz/iron-oxide vein

Goethite–hematite-rich ironstone concretion, likely veined by quartz or chalcedony

Gold and Diamond

Native Gold (Au) and Diamond (C)

Weathered jasper or iron-stained quartzite

Silicified quartz-rich rock, primarily microcrystalline quartz (SiO₂) with iron-oxide/hydroxide staining

Limonite (Iron Ore)

Limonite (mixture of hydrated iron(III) oxide-hydroxides)

Tumbled orange jasper (probable)

Microcrystalline quartz, SiO₂, colored chiefly by iron oxides

Quartz-rich pegmatite with iron-stained quartz

Quartz (SiO₂) in granitic pegmatite, likely with feldspar and iron-oxide staining

Faceted Diamond / Moissanite / Cubic Zirconia

Carbon (C) if Diamond, Silicon Carbide (SiC) if Moissanite

Likely weathered river pebble

Indeterminate lithology; possibly fine-grained sandstone, siltstone, or chert

Tumbled tiger’s-eye

Quartz variety, fibrous golden-brown quartz (SiO₂), commonly pseudomorphic after crocidolite

Tumbled iolite (water sapphire)

Iolite; cordierite, (Mg,Fe)₂Al₄Si₅O₁₈

Peridot

Olivine ((Mg,Fe)2SiO4)

Limestone

Calcium Carbonate (CaCO3)

Diamond ring

Diamond, crystalline carbon (C)

Tumbled yellow chalcedony (likely honey agate or yellow jasper)

Microcrystalline quartz, SiO₂; precise identification is uncertain from the photograph

Yellow jasper or iron-stained chert

Microcrystalline quartz (SiO₂), commonly colored by goethite/limonite and other iron oxides

Tumbled green feldspar (likely amazonite)

Microcline feldspar, KAlSi₃O₈ (amazonite variety)

Quartz geode

Quartz (SiO₂), likely chalcedony-lined geode with drusy quartz crystals

Tumbled brown jasper

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