Igneous, Sedimentary, Or Metamorphic (Mineral Based)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Mica Schist with Quartz

Mica-Quartz Schist (Muscovite subclass)

Biotite Mica

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

Peacock Ore (Bornite or Chalcopyrite treated with acid)

Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Sandstone

Arenite (primarily SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Schist

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

Biotite Mica in Host Rock

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

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Sodalite

Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Rainbow Moonstone with Black Tourmaline

White Labradorite with Schorl (Na,Ca)(Al,Si)4O8

Mica Schist (with Golden/Biotite inclusions)

K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)

Banded Calcite (often sold as 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Citrine

SiO2 (Silicon Dioxide)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Rough Green Sapphire (Corundum)

Corundum (Al2O3 - Aluminum Oxide with trace elements)

Dalmation Stone (often called Dalmatian Jasper)

Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite

Red Sandstone (Iron-Rich)

Arenite (Fe2O3)

Sandstone

Arenite (composed primarily of SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Ferruginous Quartz

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

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Muscovite (Mica)

Muscovite - KAl2(AlSi3O10)(OH)2

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Muscovite Mica

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

Greenschist

Chlorite schist

Dalmation Stone (Dalmation Jasper)

Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)

Riverstone Quartzite / Chalcedony Nugget

Silicon Dioxide (SiO2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Quartzite (River Cobble)

Quartzite (mostly SiO2)

Epidote

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

Slickenside

Tectonic Fault Scarp Surface

Biotite Mica in Quartz

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

Asphalt / Road Aggregate

Bituminous Conglomerate (synthetic)

Green Aventurine

Quartzite with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Banded Calcite (Green Onyx)

Calcium Carbonate (CaCO3)