Mineral Based Human Made Alloy

Chert (often colloquially called Flint)

Chert (Microcrystalline Quartz, SiO2)

Limestone

Sedimentary rock composed of Calcium Carbonate (CaCO3)

Basalt with Quartz/Plagioclase Inclusions

Mafic volcanic rock (Basaltic)

Porphyritic Andesite

Andesite (with white Plagioclase phenocrysts)

Vesicular Basalt

Basalt (Vesicular)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Dark weathered igneous rock, likely basalt

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Polished Yellow Jaspar

Chalcedony / Quartz (SiO2 with Iron Oxides)

Schist

Mica Schist

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Muscovite Schist

Muscovite Schist (KAl2(AlSi3O10)(OH)2 matrix)

Fuchsite

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

Lepidolite

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]

Gold-bearing Quartz with Iron Oxides

Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)

Favosite Fossil (Calyx or Rugose Coral)

Favosites (Extinct Tabulate Coral)

Ferruginous Quartz

Ferruginous Quartz (Silicon Dioxide + Iron Oxide, SiO2 + Fe2O3)

Citrine (likely Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Porphyry

Porphyritic Igneous Rock

Basalt with Quartz/Calcite Veins

Aphanitic Mafic Igneous Rock with Hydrothermal Veining

Gravel or Pebble

Clastic Sedimentary Grain (typically composed of Quartz or Silicate minerals)

Bumble Bee Jasper

Calcite and Volcanic Ash Mixture

Lepidolite in Quartz (Obelisk)

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite)

Rose Quartz (likely carved)

Rose Quartz (SiO2)

Schist (Micaceous)

Mica Schist

Fuchsite or Green Mica Schist

K(Al,Cr)2(AlSi3O10)(OH)2

Lepidolite on Matrix

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Bloodstone

Chalcedony (Variety: Bloodstone / Heliotrope), SiO2

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Heat-Treated Citrine (Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Moss Agate

Silicon dioxide (SiO2) with inclusions of hornblende or chlorite

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (Nodular Chert)

Microcrystalline Silica (SiO2)

Chert (Chert / Flint nodule)

Silicon Dioxide (SiO2)

Chert (specifically Flint)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Chert (variations include Flint/Chalcedony)

Chert (SiO2 - Silicon Dioxide)

Sandstone (lithic wake or graywacke)

Clastic sedimentary rock (primarily quartz and lithic fragments)

Banded Chert / Agate Pebble

Silicon Dioxide (SiO2)

Greenstone / Epidosite

Epidosite (primary minerals: Epidote and Quartz)

Slag (Industrial Byproduct)

Ferro-silicate glass (Slag)