Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Biotite (Black Mica)

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

Limonite-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining

Mica (Biotite or Phlogopite variety)

Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)

Granite / Quartz Vein Rock

Granitoid with Quartz (SiO2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Biotite Schist

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

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Basalt (Polished)

Extrusive mafic igneous rock

Banded Rhyolite (likely Green Jasper/Agate variety)

Silicon Dioxide (SiO2) with mineral inclusions

Quartz with Muscovite Mica

SiO2 with KAl2(AlSi3O10)(OH)2

Chert (specifically Flint Arrowhead)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Chert (Arrowhead/Tool variety)

Microcrystalline Quartz (SiO2)

Agate (Polished Nodule)

Agate (Silicon Dioxide, SiO2)

Milky Quartz with Mica (Gneiss/Schist influence)

Silicon Dioxide (SiO2) with Phyllosilicates

Basalt with Weathering Crust

Extrusive mafic volcanic rock

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

Muscovite (Mica)

Muscovite - KAl2(AlSi3O10)(OH)2

Sandstone (Micaceous Sandstone)

Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(F,OH)2

Epidote

Epidote - Ca2(Al,Fe)3(SiO4)3(OH)

Amethyst (Faceted Gemstone)

Silicon Dioxide (SiO2) with iron impurities

Mica (Muscovite)

Muscovite (KAl2(AlSi3O10)(OH)2)

Agate (specifically Botswana or Lake Superior style Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Mica-rich Schist fragment

Mica Schist

Epidote with Magnetite/Hematite inclusions

Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Grey Agate

Silicon Dioxide (SiO2) - variety: Agate/Chalcedony

Amethyst

Amethyst (Silicon Dioxide - SiO2 with Iron impurities)

Biotite Mica in Quartz

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) in Quartz (SiO2)

Quartz / Quartz Cluster

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Granodiorite (Water-worn Pebble)

Granodiorite

Sunstone with Black Tourmaline (Arfvedsonite)

Feldspar (Na,Ca)(Al,Si)4O8 with Schorl Na(Fe3+)3Al6(Si6O18)(BO3)3(OH)3(OH)

Amethyst (Tumbled)

Silicon Dioxide (SiO2 with iron impurities)

Granodiorite

Phaneritic Plutonic Granodiorite

Basalt with vesicles/amygdules

Basalt (containing volcanic glass and plagioclase)

Biotite Mica

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

Black Marble

Recrystallized Carbonate Rock (CaCO3)