Anthropogenic Specimen (Man Made)

Carved labradorite fish

Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)

Chrysocolla in Malachite

Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)

Diamond

Carbon (C)

Megalodon Shark Tooth

Otodus megalodon

Quartz (Microcrystalline/Chert)

Silicon Dioxide (SiO2)

Flint (chert) hand axe

Cryptocrystalline silica (SiO₂), worked into a bifacial stone tool

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Botryoidal chalcedony with quartz vug

Microcrystalline quartz, SiO₂ (chalcedony), with a drusy quartz-lined cavity

Petrified Wood

Silicified Wood (primarily SiO2)

Pink calcite (likely)

Calcite — calcium carbonate, CaCO₃

Coquina and Oyster Fossil Rock

Coquina limestone (Calcium Carbonate, CaCO3) containing fossilized Crassostrea / bivalve shells

Desert Rose (Gypsum Rose)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Chert Nodule

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper/Flint)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Tumbled yellow jasper or chalcedony

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Malachite

Malachite (Cu2CO3(OH)2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

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

Industrial vitreous slag; primarily amorphous silicate glass, composition variable

Native silver fragment (probable)

Silver, Ag; possibly silver-bearing sulfide or plated metal

Obsidian (volcanic glass)

Obsidian, naturally occurring rhyolitic volcanic glass; composition is silica-rich, commonly about 70–75% SiO₂

Sandstone (Pebble)

Arenite

Fossil shark tooth, likely megalodon

Fossilized shark tooth; possibly Otodus megalodon (formerly Carcharocles megalodon)

Sea Glass (Teal/Turquoise)

Amorphous Silica (SiO2) with trace metal oxides

Chalky limestone

Micritic calcite (CaCO₃), likely biogenic limestone/chalk

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Iron Slag

Ferrous Slag (Industrial Byproduct)

Larimar

Pectolite

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Dark rounded pebble, likely basalt or slag

Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag

Flint (chert) nodule

Microcrystalline quartz (SiO₂), occurring as a flint/chert nodule in limestone

Dark, weathered stone—possibly basalt or slag

Indeterminate; likely fine-grained basalt (plagioclase–pyroxene)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Quartzite

Metamorphic Quartzite (SiO2)

Iron-stained chert (flint) nodule

Microcrystalline quartz (SiO₂), with iron-oxide staining

Small metallic-gold mineral fragment, possibly pyrite

Pyrite (FeS₂), if confirmed

Tumbled greenstone (likely serpentinite or green jasper)

Serpentinite, commonly dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

Tumbled ruby-in-zoisite (likely)

Ruby-bearing zoisite; zoisite Ca₂Al₃(SiO₄)₃(OH), corundum ruby Al₂O₃

Petrified Wood

Silicified Wood (SiO2)

Diamond

Native Carbon (C)

Diamond (or Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)