Not A Geological Specimen

Yellow Quartz (Citrine/Gold Quartz)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

Garnet

Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3

Quartz

Silicon Dioxide (SiO₂)

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30

Jasper (Tiger Eye variety transition)

Silicon Dioxide (SiO2) with iron oxide inclusions

Gold and Silver (Metal Components of an Antique Pocket Watch)

Native Gold (Au) and Native Silver (Ag)

Green Tourmaline

Verdelite (Silicate mineral); Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Limestone Pebble

Calcium Carbonate (CaCO3)

Basalt (Drill Core)

Mafic Volcanic Rock (Basalt)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Basalt with Caliche Crust

Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating

Basalt with Quartz/Quartzite Veins

Aphanitic Mafic Volcanic Rock with Siliceous Infillings

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Green Moss Agate

Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite

Sunstone

Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)

Citrine (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Labradorite (Polished Crystal Point)

Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8

Sandstone (Ferruginous/Red Sandstone)

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Quartzite

Quartzite (SiO2)

Pyrite with Iron Oxides (Fool's Gold in Matrix)

Iron Sulfide (FeS2)

Quartz (Milky Quartz pebble)

Silicon Dioxide (SiO2)

Banded Iron Formation (Jaspillite)

Banded Iron Formation (BIF) / Jaspillite

Banded Chert (River Pebble)

Microcrystalline Quartz (SiO2)

Sandstone Cobble with Liesegang Rings

Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)

Ferruginous Sandstone (Ironstone Nodules)

Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)

Yellow Jasper

Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz

Quartz (Milky or Cloudy Quartz)

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Dragon Blood Jasper

Epidote-rich Quartzite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Fuchsite

Chromium-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2

Sea Shell (Fighting Conch Fragment)

Calcium Carbonate (CaCO3) - Strombus alatus fragment

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide impurities

Granite

Granite (composed primarily of Quartz SiO₂, Alkali Feldspar KAlSi₃O–NaAlSi₃O–CaAl₂Si₂O₈, and Plagioclase Feldspar)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky or Smoky Quartz)

Silicon Dioxide (SiO2)

Quartz (in matrix)

Quartz (SiO₂)

Riverstone Jasper (Chalcedony)

Silicon Dioxide (SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

Orange Calcite

Calcium Carbonate (CaCO3)