Mineral Based Human Made Alloy

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (often referred to as Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (containing Flint and Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (Chert / Flint)

Silicon Dioxide (SiO2)

Vesicular Basalt (Amygdaloidal)

Amygdaloidal Basalt

Schist

Mica Schist

Schist

Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])

Sandstone (with banding)

Arenite (primarily SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate/Jasper mix)

Silicon Dioxide (SiO2)

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Apatite

Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))

Iron Slag

Ferrous Slag (Silicate/Oxide mixture)

Pink Granite (with Potassic Feldspar and Quartz)

Felsic Intrusive Igneous Rock (Granite)

Druzy Quartz on Limestone

Silicon Dioxide (SiO2)

Gneiss (with Quartz-Feldspar vein)

Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)

Schist

Mica Schist (primarily Muscovite [KAl2(AlSi3O10)(OH)2] or Biotite)

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (or Flint)

Chert (Sedimentary Cryptocrystalline Sio2)

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variously known as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (often called Flint in this context)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varietal: Flint/Jasper mix)

Hydrous Silica (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Brecciated Chert)

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

Glazed Ceramic Tile

Fused Silicate-Clay composite

Marble

Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)

Desert Varnish on Sandstone

Ferromanganese coating on Quartz Arenite

Pink Lepidolite

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

Schist

Crystalline Metamorphic Rock (Schistose)

Mica Schist

Mica Schist (primarily Muscovite and Quartz composition)

Schist

Mica Schist

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

Amygdaloidal Basalt with Epidote/Chlorite

Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))

Mica Schist

Muscovite/Biotite Schist

Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Basalt River Cobble

Basalt (Aphanitic Mafic Volcanic Rock)

Biotite (Mica)

K(Mg,Fe)3AlSi3O10(OH,F)2

Schist

Mica Schist

Dyed Agate

Silicon Dioxide (SiO2) - variety Chalcedony