Organic Gemstone (Not A Rock Or Mineral)

Fire Opal (in Matrix)

Hydrated Silica (SiO2·nH2O)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Blue Sapphire

Corundum (Al2O3)

Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Turquoise in Matrix

Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Chert (and Flint variant)

Chert (SiO2)

Fossiliferous Limestone (Shell Fragment)

Biogenic Limestone (Calcium Carbonate / CaCO3)

Shale

Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Flint Nodular)

Chert (Silicon dioxide, SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Shale

Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)

Petrified Wood

Silicified Wood (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Pearl

Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Lapis Lazuli

Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Rose Quartz

Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Banded Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Chert / River Jasper

Microcrystalline Quartz (SiO2)

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)

Agatized Chert / Chalcedony

Silicon Dioxide (SiO2)

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Petrified Wood

Silicified wood (principally SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

Petrified Wood (Silicified Wood)

Silicified fossil wood (SiO2)

Dalmatian Stone (commonly Dyed)

Dalmatian Jasper (Peralkaline igneous rock)

Chert (Mudstone)

Microcrystalline Quartz (SiO2)

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Rose Quartz

Silicon Dioxide (SiO2) with trace titanium, iron, or manganese

Amber

Succinite (organic mineraloid); Chemical formula: C10H16O

Amethyst

Amethyst (SiO2 with Iron impurities)

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

Opal

Hydrated Silica (SiO2·nH2O)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)

Banded Agate

Silicon Dioxide (SiO2)