Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)

Lapis Lazuli

Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Sandstone (Ferruginous)

Arenite (complex silicate composition with iron oxides)

Petrified Wood

Silicified Wood (SiO2)

Gneiss (Banded Gneiss)

Gneiss

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Milky Quartz

Silicon Dioxide (SiO2)

Olivine/Peridot

Magnesium Iron Silicate (Mg,Fe)2SiO4

Bauxite / Iron-rich Laterite

Laterite (principally Al(OH)3, Fe2O3, and SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite

Jasper

Silicon dioxide (SiO2) with impurities

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Basalt (Vesicular)

Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene

Travertine (often colloquially called Tufa)

Chemical Sedimentary Calcium Carbonate (CaCO3)

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Quartz

Silicon Dioxide (SiO2)

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

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8); variety of Orthoclase Feldspar

Sandstone (Stream-rounded Cobble)

Arenite (composed primarily of SiO2, Silica)

Sandstone

Arenite (SiO2 primarily)

Sandstone

Clastic Sedimentary Rock (primarily SiO2)

Diamond

C (Carbon)

Ferruginous Chert

Microcrystalline Quartz (SiO2) with Iron Oxides

Sandstone (Red Sandstone)

Arenite (SiO2 based with Fe2O3 staining)

Blue Lace Agate (with Amethyst Geode center)

Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Liesegang Ring Siltstone

Siltstone with iron oxide Liesegang bands

Chert (specifically Flint)

Microcrystalline Quartz (SiO2)

Shale

Shale (Consolidated fine-grained clay/silt)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Limestone with Chert or Siltstone bands

Sedimentary carbonate rock (CaCO3) often with siliceous impurities

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Sandstone (Water-worn Cobble)

Arenite (variable composition, primarily SiO2)

Sandstone

Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)

Sandstone (Weathered)

Arenite (primarily SiO2)

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cementation)