Metamorphic (Low Grade)

Smoky Quartz

Silicon Dioxide (SiO2)

Moonstone

Adularia or Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8), specifically with lamellar exsolution of albite and orthoclase.

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Pyrite

Iron Disulfide (FeS2)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Graphite

Graphite (C)

Citrine Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Staurolite (Fairy Stone)

Staurolite (formula: Fe2+2Al9Si4O23(OH))

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Chrysocolla

Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Beryl (likely Aquamarine) in matrix

Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)

Caliche (also known as hardpan, calcrete, kankar)

Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.

Apatite

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

Fired Clay Brick (Anthropic Rock substitute)

Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)

Tumbled Moonstone and Amazonite Chips

Orthoclase (KAlSi3O8) and Microcline (KAlSi3O8) of the Feldspar Group

Moonstone

Orthoclase Feldspar (composed of alternate layers of orthoclase and albite), (K,Na)AlSi3O8

Smoky Quartz

Silicon Dioxide (SiO2)

Red Garnet

Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)

Charoite

Charoite (Hydrated silicate of potassium, sodium, calcium, barium and strontium): (K,Sr,Ba)(Na,Ca)2[Si4O10](OH,f)·H2O

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Lapis Lazuli

Complex mixture of minerals (lazurite, calcite, pyrite, and sodalite); (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Almandine Garnet

Almandine - Fe3Al2(SiO4)3

Tiger's Eye (Polished Point/Tower)

SiO2 (Silicon Dioxide) with included crocidolite fibers

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Lapis Lazuli

Complex metamorphic rock consisting mainly of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite

Porcelain (Stoneware Ceramic)

Mullite / Silica-glass composite (Al6Si2O13)

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

Amethyst

Quartz (SiO2) with trace iron impurities

Tiger's Eye

Tiger's Eye (a variety of Quartz, SiO₂)

Tiger's Eye (variations include Blue or Hawk's Eye)

Silicon Dioxide with Crocidolite inclusions (SiO2)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Almandine Garnet

Almandine (Fe3Al2Si3O12)