Quartz Pebble rock specimen

Quartz Pebble

Silicon Dioxide (SiO2)

Mineral (occurring as a rolled clast)

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Quartz / Common Opal rock specimen

Quartz / Common Opal

Silicon Dioxide (SiO2)

mineral

Fossiliferous Limestone rock specimen

Fossiliferous Limestone

Fossiliferous Calclutite / Bio-calcarenite (CaCO3)

sedimentary

Quartz Vein Outcrop rock specimen

Quartz Vein Outcrop

Silicon Dioxide (SiO2)

mineral

Quartzite rock specimen

Quartzite

Quartzite (primarily SiO2)

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Limonite (Ironstone) rock specimen

Limonite (Ironstone)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

mineral

Vesicular Basalt rock specimen

Vesicular Basalt

Extrusive Mafic Igneous Rock (Vesicular Basalt)

igneous

Chert (varieties include Flint or Jasper) rock specimen

Chert (varieties include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Granite rock specimen

Granite

Phaneritic Igneous Rock (Granite)

igneous

Desert Rose rock specimen

Desert Rose

Gypsum (CaSO4·2H2O) or Barite (BaSO4) with Sand inclusions

mineral

Sandstone (Quartzose) rock specimen

Sandstone (Quartzose)

Arenite (primarily SiO2)

sedimentary

Milky Quartz with Limonite rock specimen

Milky Quartz with Limonite

Silicon Dioxide (SiO2)

mineral

Milky Quartz rock specimen

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Milky Quartz rock specimen

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Quartz (Quartzite Pebble) rock specimen

Quartz (Quartzite Pebble)

Silicon Dioxide (SiO2)

metamorphic

Magnetite Orthorthotropic Rock rock specimen

Magnetite Orthorthotropic Rock

Magnetite (Fe3O4)

mineral

Chert (specifically Flint or Novaculite variant) rock specimen

Chert (specifically Flint or Novaculite variant)

Chert (Microcrystalline Quartz, SiO2)

sedimentary

Chert (Jasper variety) rock specimen

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

sedimentary

Banded Chert (Jasper) rock specimen

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

sedimentary

Amber Agate / Carnelian rock specimen

Amber Agate / Carnelian

Chalcedony (Silicon Dioxide, SiO2)

mineral

Quartz Veined Rock (Likely Graywacke or Quartzite) rock specimen

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

metamorphic

Aragonite / Calcite Geode rock specimen

Aragonite / Calcite Geode

Calcium Carbonate (CaCO3)

mineral

Red Garnet (likely Almandine or Pyrope) rock specimen

Red Garnet (likely Almandine or Pyrope)

Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)

mineral

Eudialyte rock specimen

Eudialyte

Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)

mineral

Marble rock specimen

Marble

Recrystallized Calcite Rock (CaCO3)

metamorphic

Quartz Geode rock specimen

Quartz Geode

Silicon Dioxide (SiO2)

mineral

Serpentine rock specimen

Serpentine

Serpentinite (group of minerals including Antigorite, Lizardite, or Chrysotile) (Mg, Fe)3Si2O5(OH)4

metamorphic

Celestine (or Celestite) rock specimen

Celestine (or Celestite)

Strontium sulfate (SrSO4)

mineral

Blue Dyed Agate rock specimen

Blue Dyed Agate

Chalcedony (cryptocrystalline variety of Quartz), SiO2

mineral

Pyrite rock specimen

Pyrite

Iron Sulfide (FeS2)

mineral

Tiger's Eye (Blue-Gold transition) rock specimen

Tiger's Eye (Blue-Gold transition)

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic

Blue Goldstone rock specimen

Blue Goldstone

Aventurine Glass

Man-made glass (often grouped with minerals in lapidary)

Fluorite (Green) rock specimen

Fluorite (Green)

Fluorite (Calcium Fluoride, CaF2)

mineral

Quartz Geode rock specimen

Quartz Geode

Silicon Dioxide (SiO2)

mineral

Chert (specifically Flint or Jasper variant) rock specimen

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

sedimentary

Jasper (Banded Jasper) rock specimen

Jasper (Banded Jasper)

Silicon Dioxide (SiO2) with impurities

sedimentary

Chert (Iron-stained) rock specimen

Chert (Iron-stained)

Microcrystalline quartz (SiO2)

sedimentary

Rough Diamond rock specimen

Rough Diamond

Diamond (pure Carbon, C)

mineral

Clear Quartz rock specimen

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Biotite Schist rock specimen

Biotite Schist

Biotite Mica Schist [K(Mg,Fe)3AlSi3O10(OH,F)2]

metamorphic