Man Made Composite

Quartz

Silicon Dioxide (SiO₂)

Turquoise ring stone (likely stabilized or dyed turquoise)

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Obsidian

Obsidian (volcanic glass)

Chert / Flint

Chert (varieties include Flint)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Fossiliferous Limestone

Limestone (composed primarily of calcite with included fossils CaCO3)

Coquina

Bioclastic Limestone

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Polished black-and-golden tourmaline

Schorl–dravite tourmaline, commonly represented by black schorl over brown dravite

Pearl (Biogenic Mineraloid)

Calcium carbonate (CaCO3) primarily as Aragonite

Granite

Phaneritic Felsic Igneous Rock

Banded sandstone pebble

Quartz-rich lithic sandstone; exact provenance and composition require testing

Calligraphy Stone

Mariam Jasper (Fossiliferous Limestone composed of Hematite and Shell remains)

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

Chert

Chert (Microcrystalline Quartz)

Polished/tumbled brown-and-white mineral fragment

Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral

Diamond (Cut Gemstone)

Carbon (C)

Sandstone

Arenite (with iron oxide cement)

Pearl

Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin

Sandstone

Arenite (mostly SiO2)

Diamond

Diamond (pure Carbon, C)

Sandstone Pebble

Arenite (primarily SiO2)

Sandstone (with potential mineral inclusions)

Clastic sedimentary rock (primarily Quartz, SiO2)

Diamond

Carbon (C)

Blue-green quartz-rich stone, possibly chrysoprase or aventurine

Uncertain; likely quartz (SiO₂) with green coloration from nickel-bearing minerals or inclusions

Tumbled blue-green stone, likely chrysocolla or dyed chalcedony

Probable chrysocolla (hydrated copper aluminosilicate; variable composition), though appearance could also represent dyed chalcedony

Synthetic Convention Badge (Plastic/PVC)

Polyvinyl Chloride (PVC) / Polycarbonate

Gypsum (Satin Spar / Alabaster variety)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Quartzite

Metamorphic Quartz Rock (SiO2)

Quartz cluster, possibly druzy quartz on matrix

Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain

Synthetic Zinc/Polycarbonate Composite (Bey-specimen)

Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Quartzite

Metamorphic Quartzite (SiO2)

Pearl

Aragonite / Calcium Carbonate (CaCO3)

Gastly (Trick or Trade Halloween Series)

Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)

Sandstone

Arenite (SiO2 composition dominant)

Sandstone

Arenite (SiO2 primarily)

Chalk

Carbonate rock (mainly CaCO3)

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green mica/fuchsite or chlorite inclusions

Diamond

Native Carbon (C)