Man Made Object (Metalwork)

Diamond

Carbon (C)

Greenstone Celt (Polished Stone Axe)

Metamorphosed mafic rock (often Basalt or Diabase)

Chalk

Calcium Carbonate (CaCO3)

Polished carved coral fossil (likely agatized or silicified coral)

Fossilized colonial coral; commonly *Scleractinia* or *Tabulata*, replaced by chalcedony/microcrystalline quartz

Orange Calcite

Calcite (CaCO3)

Nephrite Jade

Nephrite

Fossilized turtle shell or carapace fragment

Indeterminate Testudines; likely a fossil turtle carapace scute/bone

Chelyabinsk Meteorite

Ordinary chondrite (LL5)

Gastly (Trick or Trade Halloween Series)

Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)

Diamond

Carbon (C)

Diamond

Carbon (C)

Diamond

Carbon (C)

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Diamond (Colorless/White)

Carbon (C)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Polished black stone, possibly basalt or black jasper

Basalt (fine-grained mafic rock) or microcrystalline quartz if jasper

Fossil gastropod shell

Fossilized marine gastropod; exact genus/species requires locality and examination

Polished orbicular/porphyritic granite or breccia

Likely potassium-feldspar–quartz granite with amphibole/biotite and epidote; exact variety uncertain from the image

Polished orbicular stone, likely granite or diorite

Granite–diorite, composed mainly of feldspar, quartz, and dark amphibole/biotite

Gold (Elemental Metal)

Gold (Au)

Dark rounded stone, possibly basalt

Likely fine-grained basalt; exact identification is uncertain from the photograph

Faceted colorless gemstone, likely quartz (rock crystal) or synthetic glass imitation

Quartz: silicon dioxide (SiO₂), trigonal crystal system; exact identity cannot be confirmed visually

Diamond

Carbon (C)

Aura Quartz / Rainbow Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Diamond

Carbon (C)

Corundum (Pink Sapphire / Ruby)

Al2O3 (Aluminum Oxide)

Diamond (in a jewelry setting)

Carbon (C)

Rounded iron-rich stone or concretion

Indeterminate; possibly hematite-/goethite-bearing sandstone or an ironstone concretion

White pebble (likely quartz or milky quartz)

Quartz, SiO₂ (tentative identification from the image)

Polished brown stone, possibly tiger’s eye

Undetermined; tiger’s eye is quartz (SiO₂) with fibrous crocidolite-derived inclusions

Likely tumbled iron-stained quartz or chalcedony

Quartz/chalcedony (SiO₂), possibly limonite-coated

Likely ironstone or weathered iron-rich rock

Hematite/goethite-bearing ferruginous concretion; exact identification requires testing

Possible iron-rich concretion or weathered ironstone

Goethite/hematite-bearing limonite concretion (tentative)

Petrified Wood (Silicified Fossil)

Silicified Wood (SiO2)

Mixed sedimentary rock and mineral specimens

Predominantly limestone, chert, sandstone, and iron-oxide-bearing clasts; exact identification requires testing

Tumbled dark stone, possibly obsidian or basalt

Uncertain from the photograph; likely volcanic glass (obsidian, SiO₂) or fine-grained basalt

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Uncertain dark metallic mineral specimen

Possibly galena (lead sulfide, PbS), though the image is too blurred for reliable identification

Polished amethyst bead fragments

Amethyst, purple quartz (SiO₂)

Black tumbled stone, possibly black tourmaline

Uncertain from the image; possibly schorl tourmaline, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Small tumbled brown stone, likely iron-stained quartz or jasper

Quartz (SiO₂) or microcrystalline quartz (chalcedony/jasper), identification uncertain from the image

Native American Pottery Sherd