Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite) rock specimen

Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)

Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)

mineral

Jasper Breccia rock specimen

Jasper Breccia

Silicon Dioxide (SiO2) with impurities

sedimentary

Jasper Breccia rock specimen

Jasper Breccia

Silicon Dioxide (SiO2) with impurities

sedimentary

Rose Quartz rock specimen

Rose Quartz

SiO2 (Silicon Dioxide with trace inclusions of Phosphorus, Aluminum, or Titanium)

mineral

Calcite rock specimen

Calcite

Calcium Carbonate (CaCO3)

mineral

Limonite (Iron Ore) rock specimen

Limonite (Iron Ore)

Limonite (̑FeO(OH)·nH₂O)

sedimentary

Milky Quartz rock specimen

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Black Obsidian rock specimen

Black Obsidian

Volcanic Glass (SiO2)

igneous

Nephrite Jade rock specimen

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

metamorphic

Quartzite (Milky) rock specimen

Quartzite (Milky)

Quartzite (SiO2)

metamorphic

Chert (Flint) rock specimen

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Milky Quartz rock specimen

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Clear Quartz rock specimen

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Amethyst rock specimen

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral

Sandstone Concretion rock specimen

Sandstone Concretion

Sandstone (Sedimentary Rock) with silica or calcite cement

sedimentary

Chert (Flint Nodules) rock specimen

Chert (Flint Nodules)

Silicon Dioxide (SiO2)

sedimentary

Desert Rose rock specimen

Desert Rose

Gypsum (variety Selenite) or Barite, CaSO4·2H2O

mineral

Red Chert rock specimen

Red Chert

Microcrystalline Quartz (SiO2)

sedimentary

Quartzite with Hematite rock specimen

Quartzite with Hematite

Silica (SiO2) with Ferric Oxide (Fe2O3) inclusions

metamorphic

Hematite rock specimen

Hematite

Iron(III) oxide (Fe2O3)

mineral

Jasper rock specimen

Jasper

Silicon dioxide (SiO2)

sedimentary

Jasper rock specimen

Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

Black Pearl Granite (Gabbro/Norite) rock specimen

Black Pearl Granite (Gabbro/Norite)

Phaneritic Igneous Rock (primarily Mafic)

igneous

Granite (specifically Brown Granite Countertop) rock specimen

Granite (specifically Brown Granite Countertop)

Phaneritic Felsic Igneous Rock (Granite-Gabbro series)

igneous

Tan Brown Granite rock specimen

Tan Brown Granite

Phaneritic Biotite-Feldspar Granite

igneous

Quartz with mica and feldspar (Pegmatite fragment) rock specimen

Quartz with mica and feldspar (Pegmatite fragment)

Granitic Pegmatite (composed mainly of SiO2 with KAlSi3O8)

igneous

Clear Quartz (Rock Crystal) rock specimen

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral

Specular Hematite with Quartz and Limonite rock specimen

Specular Hematite with Quartz and Limonite

Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)

Mineral

Sparkling Druzy Quartz on Matrix rock specimen

Sparkling Druzy Quartz on Matrix

Silicon Dioxide (SiO2) with iron oxide inclusions

mineral

Sandstone with Iron Oxide (Limonite/Hematite) rock specimen

Sandstone with Iron Oxide (Limonite/Hematite)

Ferruginous Sandstone (SiO2 with FeO(OH)·nH2O)

sedimentary

Chert (Flint) rock specimen

Chert (Flint)

Silicon Dioxide (SiO2)

sedimentary

Smoky Quartz rock specimen

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities and natural radiation

mineral

Quartz (Druzy) rock specimen

Quartz (Druzy)

Silicon Dioxide (SiO2)

mineral

Quartzite rock specimen

Quartzite

Quartzite (SiO2)

metamorphic

Limonite (Iron Ore) rock specimen

Limonite (Iron Ore)

Goethite and related iron hydroxides (FeO(OH)·nH2O)

mineral

Magnetite with Pyrite or Chalcopyrite inclusions rock specimen

Magnetite with Pyrite or Chalcopyrite inclusions

Magnetite (Fe3O4) with Pyrite (FeS2)

mineral

Quartz (Citrine or Iron-stained Quartz) rock specimen

Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

mineral

Basalt (Vesicular) rock specimen

Basalt (Vesicular)

Extrusive mafic igneous rock

igneous

Arsenopyrite rock specimen

Arsenopyrite

Arsenopyrite (FeAsS)

mineral

Magnetite (Lodestone variety) rock specimen

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

mineral

Ferruginous Sandstone (Ironstone) rock specimen

Ferruginous Sandstone (Ironstone)

Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))

sedimentary

Basalt rock specimen

Basalt

Basalt (Mafic Extrusive Igneous Rock)

igneous