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

Pink Granite rock specimen

Pink Granite

Phaneritic Acidic Igneous Rock (primarily SiO2, Al2O3, K2O)

igneous

Granite rock specimen

Granite

Felsic intrusive igneous rock

igneous

Travertine rock specimen

Travertine

Terrestrial Sedimentary Rock (Calcium Carbonate, CaCO3)

sedimentary

Sandstone (Quartzose) rock specimen

Sandstone (Quartzose)

Arenite (primarily SiO2)

sedimentary

Pink Quartzite rock specimen

Pink Quartzite

Quartzite (SiO2 with iron oxide impurities)

metamorphic

Fluorite rock specimen

Fluorite

Calcium Fluoride (CaF2)

mineral

Chert (White Chert) rock specimen

Chert (White Chert)

Microcrystalline Quartz (SiO2)

sedimentary

Chert (Holey Stone) rock specimen

Chert (Holey Stone)

Microcrystalline Quartz (SiO2)

sedimentary

Sandstone (Water-worn Cobble) rock specimen

Sandstone (Water-worn Cobble)

Arenite (SiO2 based)

sedimentary

Blue Chalcedony rock specimen

Blue Chalcedony

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

mineral

Sandstone rock specimen

Sandstone

Arenite (primarily SiO2)

sedimentary

Sandstone (Quartzite-rich) rock specimen

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primary)

sedimentary

Chalcedony (Quartz Var.) rock specimen

Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)

mineral

Laterite rock specimen

Laterite

Laterite (Iron and aluminum-rich residual rock)

sedimentary

Basalt rock specimen

Basalt

Extrusive mafic igneous rock

igneous

Diamond rock specimen

Diamond

Diamond (pure Carbon, C)

mineral

Diamond rock specimen

Diamond

Diamond (pure Carbon, C)

mineral

Pink Granite rock specimen

Pink Granite

Phaneritic Felsic Igneous Plutonic Rock

igneous

Gneiss rock specimen

Gneiss

Gneiss

metamorphic

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Pink Granite rock specimen

Pink Granite

Granite (Phaneritic intrusive rock)

igneous

Milky Quartz rock specimen

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Sandstone rock specimen

Sandstone

Arenite (Siliclastic sedimentary rock)

sedimentary

Slag Glass rock specimen

Slag Glass

Amorphous Silica / Glass Slag

industrial byproduct (anthropogenic rock-like material)

Sandstone (Glacial Cobble) rock specimen

Sandstone (Glacial Cobble)

Arenite / Sedimentary Rock (primarily SiO2)

sedimentary

Quartz with Iron Staining rock specimen

Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

mineral

Limestone rock specimen

Limestone

Calcium Carbonate (CaCO3)

sedimentary

Marble rock specimen

Marble

Recrystallized Calcite (CaCO3)

metamorphic

White Marble rock specimen

White Marble

Recrystallized Calcite (CaCO3)

metamorphic

White Quartz rock specimen

White Quartz

Silicon Dioxide (SiO2)

mineral