Sedimentary Or Metamorphic (Low Grade)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2 permineralization)

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Petrified Wood

Silicified wood (principally Silicon Dioxide, SiO2)

Limonite (Iron Stone/Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Serpentinite

Serpentinite (composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite)

Serpentinite

Serpentinite (a rock composed predominantly of serpentine group minerals)

Goldstone (with Tiger's Eye and Quartz)

Aventurine glass (Synthetic SiO2 with Cu inclusions)

Fluorite Octahedron

Fluorite (Calcium Fluoride, CaF2)

Chert Nodule

Chert (SiO2)

Blue Sapphire

Corundum (Al2O3)

Labradorite

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

Green Fluorite

Calcium Fluoride (CaF2)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Siltstone with Weathering Rind

Siltstone (composed of microscopic quartz and clay minerals)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Calcite

Calcium Carbonate (CaCO3)

Granite / Gneiss Complex

Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Lapis Lazuli

Lazurite (primary mineral component), (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron Oxide inclusions)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Apatite

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

Rough Dark Green Sapphire

Corundum (Al2O3)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Greywacke

Lithic Sandstone

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Fluorite

Calcium Fluoride (CaF2)

Chalcedony in Host Rock

Chalcedony (SiO2)

Pyrite

Iron Sulfide (FeS2)

Calcite (Optical Grade/Iceland Spar)

Calcium Carbonate (CaCO3)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Pyrite

Iron Sulfide (FeS2)