Man Made Composite

Likely muscovite mica

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

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

Polished hematite (specimen identification uncertain)

Hematite, α-Fe₂O₃

Chalcedony (likely agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Polished black-and-golden tourmaline

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

Polished brown jasper (likely iron-rich jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

Diamond (Cut Gemstone)

Carbon (C)

Polished jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with possible iron-oxide and other mineral inclusions

Banded sandstone pebble

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

Chert

Chert (Microcrystalline Quartz)

Pearl

Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin

Quartzite

Metamorphic Quartz Rock (SiO2)

Sandstone

Arenite (mostly SiO2)

Tumbled yellow chalcedony (possibly citrine or pale agate)

Chalcedony, microcrystalline quartz (SiO₂); exact variety cannot be confirmed visually

Quartzite

Metamorphic Quartzite (SiO2)

Likely rough green-blue glassy mineral fragment

Unidentified; the image is insufficient to distinguish a natural mineral from industrial slag or glass

Calligraphy Stone

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

Tumbled carnelian

Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Polished hematite

Hematite, iron(III) oxide (α-Fe₂O₃)

Granite

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

Synthetic Convention Badge (Plastic/PVC)

Polyvinyl Chloride (PVC) / Polycarbonate

Quartzite

Metamorphic Quartz Arenite (SiO2)

Quartzite

Metamorphic Quartz Arenite

Chert (likely flint)

Microcrystalline quartz (SiO₂), variety chert; flint is a dark chert variety

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Gypsum (Satin Spar / Alabaster variety)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Polished carnelian agate

Microcrystalline quartz (SiO₂), chalcedony variety; orange-red color commonly from iron oxides

Sandstone

Arenite (with iron oxide cement)

Exposed aggregate concrete (stone-chip surface)

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

Quartzite

Metamorphic Quartz Arenite

Likely chert (flint)

Microcrystalline quartz (SiO₂), likely chert; exact identification is uncertain from the image alone

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Quartzite

Metamorphic Quartzite (SiO2)

Gastly (Trick or Trade Halloween Series)

Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)

Flint (chert)

Microcrystalline quartz, SiO₂

Flint (chert)

Microcrystalline quartz (SiO₂), a variety of chert

Diamond

Diamond (pure Carbon, C)

Quartzite

Metamorphic Quartz Arenite (SiO2)

Sandstone

Arenite (SiO2 primarily)

Chalk

Carbonate rock (mainly CaCO3)

Kyanite

Aluminium Silicate, Al2SiO5

Flint (gray chert)

Microcrystalline quartz (SiO₂), a variety of chert