Man Made Material (Metal)

Quartzite

Quartzite (SiO2)

Iron meteorite candidate

Probable iron-rich meteorite; possible stony-iron or weathered nickel–iron alloy

Iron-oxide-rich weathered rock

Limonite/goethite-bearing ironstone; chiefly hydrated iron oxides, often FeO(OH)·nH₂O

Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone

Indeterminate; likely basaltic or ferruginous rock containing iron oxides/hydroxides such as hematite (Fe₂O₃) and limonite/goethite

Likely citrine or yellow glass imitation in a silver-tone bracelet

Citrine: quartz, SiO₂; exact material cannot be confirmed visually

Quartzite

Metamorphosed Sandstone (primarily SiO2)

Dark igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite

Quartzite (SiO2)

Sandstone

Arenite (primarily SiO2)

Hematitic Sandstone

Sandstone with Iron Oxide (Hematite) staining

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Polished yellow jasper cabochon

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions

Granite / Diorite (Granodiorite)

Granodiorite / Quartz Diorite

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8); variety of Orthoclase Feldspar

Polished fossiliferous limestone, possibly ammonite-bearing

Calcite-rich limestone (CaCO₃), with fossil shell material

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Arenite

Sandstone (Quartzose)

Arenite (primarily SiO2)

Quartz-rich hydrothermal ore rock, likely gold-bearing quartz vein

Milky quartz (SiO₂) with iron-oxide staining and probable sulfide minerals; host rock may be schist or altered granite

Iron Slag

Anthropogenic Vitreous Ferrous Silicate

Diamond (in Ring Setting)

Diamond (C)

Iron meteorite (probable)

Fe–Ni metallic meteorite, possibly an ordinary chondrite or iron-rich meteorite

Polished chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron/manganese oxide inclusions

Opal stud earrings

Opal, hydrated amorphous silica (SiO₂·nH₂O)

Asphalt (Bituminous Concrete)

Composite material (bitumen binder with mineral aggregate)

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

Sandstone

Arenite (with iron oxide cement)

Turquoise cabochon pendant

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

Limonite/goethite-rich ironstone

Limonite (hydrated iron oxides, chiefly FeO(OH)·nH₂O), commonly mixed with goethite and hematite

Gold-bearing quartz vein fragment (probable placer gold specimen)

Quartz (SiO₂) with probable native gold (Au) and iron-oxide staining

Polished banded agate (probable)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Tumbled greenstone, likely nephrite jade

Nephrite jade (interlocking tremolite–actinolite amphibole; Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)

Milky Quartz

Silicon Dioxide (SiO2)

Native Copper

Native Copper (Cu)

Bismuth Crystal

Bismuth (Bi)

Coquina

Biogenic Limestone (Coquina)

Chert (Siltstone / Flint)

SiO2 (Cryptocrystalline Quartz)

Rainbow aura quartz cluster

Quartz, silicon dioxide (SiO₂), artificially coated with a thin metallic film

Vesicular basalt (likely scoriaceous basalt)

Scoriaceous basalt; primarily calcium-rich plagioclase, pyroxene, and olivine with iron-oxide alteration

Blue-green chrysocolla rough specimen

Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite