Anthropogenic (Man Made Industrial Deposit)

Smoky quartz crystal fragment

Quartz (silicon dioxide, SiO₂), likely smoky variety

Green Slag Glass

Amorphous Silica / Glassy Blast Furnace Slag

Polished smoky quartz crystal point

Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions

Tumbled orange calcite

Calcite (CaCO₃), likely iron-stained honey/orange calcite

Likely gold-bearing quartz vein rock

Quartz (SiO₂), possibly with native gold and iron sulfides/oxides

Silver (Jewelry form)

Native Silver (Ag)

Quartzite Pebble

Quartzite (SiO2)

Rose Quartz Beads

SiO2 (Silicon Dioxide with trace inclusions of Ti, Fe, or Mn)

Graywacke (River Cobble)

Lithic Sandstone (Graywacke)

Diamond

Natural Diamond (Carbon, C)

Ironstone concretion (likely a hematite-rich nodule)

Ferruginous ironstone concretion; iron oxides/hydroxides, chiefly hematite (Fe₂O₃) and/or goethite (FeO(OH))

Amethyst

Silicon Dioxide (SiO2)

Black tourmaline (schorl)

Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Fluorite

Fluorite (calcium fluoride, CaF₂)

Rose quartz heart

Quartz, silicon dioxide (SiO₂), pink variety

Tumbled rose quartz

Quartz (SiO₂), pink variety

Tumbled gray agate (chalcedony)

Microcrystalline quartz, SiO₂; likely banded or translucent chalcedony

Polished copper-bearing mineral specimen, likely malachite-rich copper ore

Malachite, Cu₂CO₃(OH)₂, possibly mixed with chrysocolla or limonite

Tumbled brown jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and clay inclusions

Polished green aventurine (likely)

Quartz-rich aventurine; silicon dioxide (SiO₂) with green fuchsite mica or chlorite inclusions

Pearl

Biogenic CaCO3 (Aragonite and Calcite)

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Pyrulite (Pyrite / Chalcopyrite)

Iron Sulfide (FeS2) or Copper Iron Sulfide (CuFeS2)

Coquina

Bioclastic Limestone

United States Quarter Dollar

Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)

Vesicular basalt (likely scoria)

Basaltic scoria; predominantly plagioclase, pyroxene, and olivine in a mafic volcanic glass/microcrystalline matrix

Polished rainbow jasper (likely ocean/imperial jasper)

Microcrystalline quartz (SiO₂) with iron oxides and varied silicate inclusions

Yellow chalcedony (likely lemon agate or yellow jasper)

Microcrystalline quartz, SiO₂; possibly iron-bearing jasper or chrysoprase-like chalcedony

Coquina

Bioclastic Limestone

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or quartzite

Rounded quartz-rich pebble

Likely quartz arenite (quartz sandstone) or quartz-rich metamorphic pebble

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Smoky quartz ring

Quartz (SiO₂), likely smoky quartz; the surrounding stones and metal cannot be identified reliably from the image.

Peridot (Olivine)

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Orange fire opal jewelry

Precious opal, hydrated amorphous silica (SiO₂·nH₂O)

Coquina and Oyster Fossil Rock

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

Amethyst-bearing quartz geode or vein specimen

Quartz, SiO₂; purple coloration from trace iron and irradiation

Weathered limestone or calcareous concretion

Calcite-rich limestone; predominantly calcium carbonate (CaCO₃)

Black-and-white tourmaline (schorl in quartz)

Schorl, a sodium iron tourmaline: NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄; the pale material may be quartz or feldspar.

Weathered river pebble, likely quartz-rich sandstone or iron-stained quartzite

Provisional identification: quartz-rich sandstone/quartzite; exact composition cannot be confirmed from the image

Graywacke (Sandstone)

Lithic Sandstone (Graywacke)