Synthetic Or Natural Fiber

Basalt (Weathered)

Extrusive Igneous Rock (Mafic composition)

Dendritic Agate or Spotted Quartzite

Silicon Dioxide (SiO2) with inclusions

Amber

Succinicum (Organic polymer, largely C10H16O)

Chrysocolla on Matrix

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Jasper

Silicon Dioxide (SiO2)

Limonite

Limonite (Hydrated iron oxide mixture, FeO(OH)·nH2O)

Chrysocolla

Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O

Jasper

Jasper (Silicon Dioxide, SiO2)

Leopard Skin Jasper

Jasper (Silicon Dioxide with impurities), SiO2

Banded Iron Formation (BIF)

Banded Iron Formation (predominantly Hematite Fe2O3 and magnetite Fe3O4 alternating with Chert SiO2)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Quartz Geode

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2) with impurities

Black Jasper

Silicon Dioxide (SiO2) with Carbonaceous inclusions

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone

Arenite (Siliclastic Sedimentary Rock)

Moonstone (specifically Rainbow Moonstone / White Labradorite)

White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)

Quartzite

Quartzite (primarily SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Petrified Wood

Silicified Wood (SiO2)

Granite (phaneritic background) with Limestone/Calcite carving

Felsic Igneous Plutonic Rock (background) / Calcium Carbonate (CaCO3) (carving)

Jasper

Silicon dioxide (SiO2)

Iron-Nickel Meteorite

Siderite (Fe, Ni)

Tiger's Eye

SiO2 (Quartz with inclusion of iron oxides)

Petrified Wood

Silicified Wood (primarily Silicon Dioxide, SiO2)

Ruby in Fuchsite

Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Puddingstone (Gowganda Tillite/Lorrain Quartzite)

Jasper Conglomerate

Green Jasper

Silicon Dioxide (SiO2)

Fossilized Coral

Cnidaria (Anthozoa), often replaced by Calcium Carbonate (CaCO3) or Silica (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Porphyritic Basalt

Basalt (with plagioclase phenocrysts)

Amethyst (Chevron Amethyst/Dream Amethyst)

Silicon Dioxide (SiO2) with trace Iron impurities

Carnelian Agate

Chalcedony (SiO2) with iron oxide inclusions

Sandstone (likely Graywacke or Arkosic varieties)

Arenite (composed primarily of SiO2)

Limonite Concretion

Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O

Red Jasper (possibly Red Coral or dyed Howlite)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Seashell Fragment (Aragonite/Calcite)

Calcium Carbonate (CaCO3) - Shell fragment

Sodalite

Sodalite [Na8(Al6Si6O24)Cl2]

Milky Quartz with Hematite inclusions

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions