Man Made Object (Metalwork)

Fossil Shark Tooth

Carcharocles or Lamniformes (order)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Chert (Field-collected Arrowhead-shaped Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Native Silver

Silver (Ag)

Chert (specifically Gray/Blue-Gray Chert)

Chert (SiO2)

Pyrite

Iron Sulfide (FeS2)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Chert (specifically Zebra Chert/Flint)

Silicon Dioxide (SiO2)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Blue-dyed Quartz Druzy

Silicon Dioxide (SiO2) with artificial pigment

Tiger's Eye

Silicon dioxide (SiO2) with fibrous inclusions of crocidolite

Polished black-and-white banded stone, likely tourmalinated quartz or zebra jasper

Quartz (SiO₂) with black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄), or quartz-rich zebra jasper

Tumbled carnelian

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

Tumbled red jasper

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

Dalmatian jasper

Orbicular rhyolite, commonly sold as Dalmatian jasper; mainly quartz, feldspar, and altered mafic minerals

Likely tumbled jasper or chert specimens

Microcrystalline quartz (SiO₂), commonly jasper/chert; exact identification is uncertain from the photograph

Rounded chert or chalcedony pebble

Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony

Fluorite

Calcium fluoride (CaF2)

Botryoidal chalcedony (gray agate/jasper-like silica)

Microcrystalline quartz, SiO₂; likely chalcedony with opaque quartz or jasper inclusions

Polished jasper pebble

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

Howlite

Ca2B5SiO9(OH)5

Rose Quartz

Silicon Dioxide (SiO2)

Tumbled black-and-gold tiger’s-eye

Quartz pseudomorph after crocidolite; SiO₂ with iron oxides

Tumbled howlite (likely)

Howlite, Ca₂B₅SiO₉(OH)₅

Polished brecciated jasper (likely orbicular/picture jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide staining and breccia fragments

Polished labradorite cabochon

Labradorite, a calcic plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈

Colorless faceted gemstone (likely cubic zirconia)

Cubic zirconia, ZrO₂ (synthetic zirconium dioxide); possibly synthetic glass or lab-grown diamond

Fluorite

Calcium Fluoride (CaF2)

Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Petrified Wood

Silicified Wood (SiO2)

Hematite

Hematite (Fe2O3)

Honey Calcite

Calcium Carbonate (CaCO3)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Lapis Lazuli

Lapis Lazuli (Complex rock containing Sodalite, Lazurite, Calcite, and Pyrite)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Agate

Silicon Dioxide (SiO2)

Larvikite

Larvikite (Augite Syenite)

Labradorite in Matrix

(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Ocean Jasper

Silicon Dioxide (SiO2)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Yellow Jasper

SiO2 (Silicon Dioxide)