Metamorphic Or Sedimentary (With Staining)

Slate

Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)

Garnet in Matrix (likely Almandine in Quartz/Mica Schist)

Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock

Serpentine

Serpentine group, including Antigorite, Lizardite, and Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Labradorite

Labradorite (Ca, Na)(Al, Si)4O8

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Agate

Silicon Dioxide (SiO2)

Moonstone

Orthoclase (Potassium Feldspar) - (K,Na)AlSi3O8

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Schist

Mica Schist

Ruby in Kyanite

Corundum (Al2O3) in Kyanite (Al2SiO5)

Quartz with Mica (Schist/Pegmatite fragment)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Fulgurite

Fulgurite (Lechatelierite)

Tiger's Eye (often misinterpreted as Gold Ore in this context)

Pseudomorph of Quartz after Crocidolite (SiO2)

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Yellow Apatite Sphere (Polished)

Fluorapatite / Ca5(PO4)3F

Green Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Fuchsite

Quartzite

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (complex of lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)

Serpentine (Nephrite-like Serpentine)

Serpentinite (Hydrous magnesium iron phyllosilicate)

Slate

Slate (Foliated metamorphic rock)

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)

Marble

Metamorphosed Limestone (mainly CaCO3)

River Pebble (Gneiss or Quartzite variant)

Course-grained Metamorphic Rock (likely SiO2 dominant)

Granite (Weathered)

Phaneritic Felsic Igneous Rock

Rainbow Moonstone

White Labradorite (formula: (Na,Ca)(Al,Si)4O8)

Greenschist

Greenschist (comprising Actinolite, Chlorite, and Epidote)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Corundum (Sapphire variant)

Aluminium oxide (Al2O3)

Muscovite (Mica) in Quartz Matrix

Muscovite (KAl2(AlSi3O10)(OH)2) and Quartz (SiO2)

Unakite (or Epidote-rich Granite)

Unakite (composed of Epidote {Ca2(Al, Fe)3(SiO4)3(OH)}, Pink Orthoclase Feldspar {KAlSi3O8}, and Quartz {SiO2})

Unakite

Epidotized Granite

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Tiger's Eye (Golden)

Pseudomorph of Quartz after Crocidolite (SiO2 with FeOOH inclusions)

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2)

Tiger's Eye (likely Hawk's Eye variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

Quartzite

Quartzite (SiO2)

Red Garnet

Almandine and Pyrope (Silicate minerals: Fe3Al2(SiO4)3 and Mg3Al2(SiO4)3)

Ruby in Fuchsite (often sold as Ruby in Zoisite)

Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Sodalite

Na8(Al6Si6O24)Cl2

Unakite or Epidosite

Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)