Man Made Material (Jewelry, Metal Alloy)

Quartz Geode

Silicon Dioxide (SiO2)

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Schist

Mica Schist

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Mica Schist

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

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Chondrite Meteorite

L3 Chondrite (Unequilibrated Ordinary Chondrite)

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

Jasper

Jasper (Silicon Dioxide, SiO2)

River Rock (Quartzite/Chert conglomerate)

Quartzite (SiO2)

Peridotite

Peridotite (Ultramafic Rock)

Chert (specifically Yellow or River Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Serpentinite

Serpentinite (composed primarily of serpentine group minerals like lizardite, chrysotile, or antigorite; Mg3Si2O5(OH)4)

Serpentinite

Serpentinite (composed primarily of mineral group (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)

Basalt (River Stone)

Aphanitic Mafic Igneous Rock

Oolitic Limestone

Oolite (Sedimentary Calcium Carbonate)

Fluorite

Calcium Fluoride (CaF2)

Granite (specifically Rapakivi Granite)

Phaneritic Felsic Igneous Rock (Granite)

Basalt with Peridotite Inclusion

Mafic Volcanic Rock (Extrusive Igneous) with Ultramafic Xenolith

Schist

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

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Schist

Mica Schist

Mica Schist

Schist (Muscovite/Biotite Schist)

Chert (specifically Flint or Dark Chert)

Chert (SiO2)

Barite

Barium Sulfate (BaSO4)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Mica)

Laterite

Laterite (Ferricrete)

Quartzite

Quartzite (primarily SiO2)

Schist

Mica Schist (Quartz-Muscovite-Biotite Schist)

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Biotite Schist

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

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Desert Varnish (on Sandstone)

Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)

Siltstone with iron staining

Siltstone (primarily SiO2 with FeO(OH) coatings)

Basalt with Scoria/Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Diorite

Diorite (Intermediate intrusive igneous rock)

Scoria (Lava Rock)

Vesicular Basalt / Scoria

Limonite-pseudomorph after Pyrite (Prophecy Stone)

Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Chert (Nodular Chert)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Fossil / Permineralized Bone

Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)

Lava Rock (Scoria)

Scoria (Vesicular Basalt)