Metamorphic Rock (Primarily Composed Of Minerals)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granular Sandstone

Arenite (variable composition, primarily SiO2)

Nephrite Jade

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

Milky Quartz

Silicon Dioxide (SiO2)

Gneiss

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Aventurine

Silicon Dioxide (SiO2) with inclusions

Geode (Unopened)

Silica-rich concretion (SiO2)

Blue Sapphire

Corundum (Al2O3)

Ironstone Concretion (Limonite/Goethite)

Ironstone (primarily FeO(OH)·nH2O)

Nephrite Jade

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

Sandstone (Fossiliferous)

Clastic Sedimentary Rock (primarily SiO2)

Pyrite

Iron Disulfide (FeS2)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Strawberry Quartz (or Hematoid Quartz)

Silicon Dioxide (SiO2) with inclusions of Hematite or Goethite

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Pink Granite

Felsic intrusive igneous rock

igneous

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2)

Almandine Garnet in Matrix

Almandine, Fe3Al2(SiO4)3

Nephrite Jade

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

Iolite (Cordierite)

Cordierite (Magnesium iron aluminum cyclosilicate), Mg2Al4Si5O18

Citrine (Heat-treated or Natural Quartz)

Silicon Dioxide (SiO2)

Sandstone (with banding)

Arenite (primarily SiO2)

Quartzite (Milky Quartz pebble)

Silicon Dioxide (SiO2)

Tiger's Eye

Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2

Botryoidal Chalcedony (Desert Rose / Agate)

Silicon Dioxide (SiO₂)

Mineral variant

Chert (Septarian Concretion/Nodule)

Microcrystalline silica (SiO2) with carbonate mineral veining

Hematite

Hematite (Fe2O3)

Fossil Shell (Bivalve)

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

Quartzite (Water-worn Cobble)

Quartzite (Composition: 90%+ SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Clear/White)

Silicon Dioxide (SiO2)

Jasper with Quartz inclusions

Silicon Dioxide (SiO2)

Serpentine (Serpentinite)

Antigorite, Lizardite, and Chrysotile: (Mg,Fe)3Si2O5(OH)4

Prasiolite (Green Quartz)

Silicon Dioxide (SiO2) with iron impurities

Gold Ore in Matrix

Native Gold (Au) in Quartz/Limonite host rock

Gneiss (Banded Gneiss)

Gneiss

Sodalite

Na8(Al6Si6O24)Cl2

Sandstone

Arenite (SiO2 based typically)