Non Geological

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Verde Antique Marble (Serpentinite)

Serpentinite (composed mainly of Serpentine group minerals, Mg3Si2O5(OH)4)

Shiva Lingam

Cryptocrystalline Quartz (Jasper/Chalcedony) with Iron Oxide inclusions

Apache Tear (Obsidian)

Hydrated volcanic glass (SiO2 with inclusions)

Clear Quartz

Silicon Dioxide (SiO2)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)

Granite

Phaneritic Felsic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)

Pyrite

Iron Sulfide (FeS2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (SiO2 based)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Clear Quartz

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic Acid Igneous Rock)

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Granite

Phaneritic Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Chert (Yellow Jasper variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz (Milky/Common variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert

Silicon dioxide (SiO2)

Apache Tear (Obsidian)

Volcanic glass (SiO2 - Silicon Dioxide)

Coral Fossil (Scleractinia)

Scleractinia (Order), primarily CaCO3 (Aragonite or Calcite)

Quartz (Small fragments)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Diorite (Salt and Pepper Rock)

Diorite

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Rose Quartz

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

Basalt

Extrusive mafic igneous rock

Lapis Lazuli (Tumbled Specimen)

Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Garnet (specifically Almandine or Pyrope)

Almandine (Fe3Al2Si3O12) or Pyrope (Mg3Al2Si3O12)

Jasper

Silicon dioxide (SiO2)

Biotite Mica

K(Mg, Fe)3AlSi3O10(F, OH)2

Nephrite Jade

Calcium Magnesium Iron Silicate Hydroxide - Ca2(Mg,Fe)5Si8O22(OH)2