Mineral Based Human Made Alloy

Polished orange agate or chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/agate

Polished blue banded agate slice

Chalcedony (microcrystalline quartz), SiO₂, commonly with trace iron and other coloring elements

Tumbled red jasper with a quartz vein

Jasper (microcrystalline quartz, SiO₂), likely crossed by milky quartz

Chert (Flinty variety)

Microcrystalline Quartz (SiO2)

Turquoise

Hydrate phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Agate

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony

Dyed mineral cluster, likely calcite or aragonite

Calcite (CaCO₃) or aragonite (CaCO₃), artificially color-enhanced

Likely tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing

Tumbled rose quartz (probable)

Quartz, silicon dioxide (SiO₂), pink variety commonly called rose quartz

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Silver (Native Element)

Ag (Argentum) - 90% Silver, 10% Copper alloy in specimen

Pyrite

Iron Pyrite (FeS2)

Quartz pebble (Quartztite fragment)

Silicon Dioxide (SiO2)

Chert (and Flint)

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC)

Galena (likely)

Galena, lead sulfide (PbS)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Rainbow Hematite (Titanium-Coated Hematite)

Titanium-treated Hematite (Fe2O3)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Slag

Anthropogenic Iron Silicate Glass

Dalmatian jasper

Orbicular rhyolite, commonly marketed as Dalmatian jasper; quartz–feldspar volcanic rock with dark aegirine/arfvedsonite-like inclusions

Brecciated Jasper

Brecciated Jasper (Microcrystalline Quartz / SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Chalcedony (Agate / Jasper Specimen)

Silicon Dioxide (SiO2)

Aura Quartz (Titanium Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti)

Diamond (in Jewelry)

Carbon (C)

Carved serpentine wing sculpture

Serpentine-group rock, chiefly antigorite/lizardite: Mg3Si2O5(OH)4

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

Chert (Field-collected Arrowhead-shaped Fragment)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Likely galena-bearing ore

Galena (PbS), possibly mixed with quartz or carbonate gangue

Sandstone

Clastic Sedimentary Rock

Synthetic Resin Charm (Seal Shape)

Polymer Resin with plastic glitter / Polyethylene terephthalate glitters

Sandstone

Arenite (composed primarily of SiO2)

Sandstone Concretion

Limonitic Sandstone Concretion

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Sea Glass

Silicon dioxide (mostly)

Polished/tumbled brown jasper or iron-rich chert

Microcrystalline quartz (SiO₂), commonly colored by hematite/goethite

Chalcedony (Yellow Agate/Chert)

Silicon Dioxide (SiO2)

Turquoise

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

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Banded Agate

Cryptocrystalline Quartz (SiO2)