Mineral Like (Anthropogenic)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Nuummite

Antophyllite-Gedrite (Orthorhombic amphiboles)

Banded Iron Formation (BIF)

Banded Iron Formation

Granite

Granite (Mainly Quartz, Feldspar, and Mica)

Red Vanadinite on Matrix

Vanadinite (Pb5(VO4)3Cl)

Plume Agate

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Serpentinite

Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)

Quartzite

Quartzite (Primary mineral: SiO2)

Chert (specifically Jasper/Carnelian Agate)

Microcrystalline Quartz (SiO2)

Basalt

Extrusive mafic igneous rock

Eudialyte

Na15Ca6Fe3Zr3Si26O72(OH,Cl)2 (Eudialyte Group)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides

Quartzite (Milky Quartz pebble)

Silicon Dioxide (SiO2)

Mahogany Obsidian

Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2

Schist (Graphite or Mica rich)

Crystalline Schist (often containing Muscovite, Biotite, or Graphite)

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Marble

Recrystallized Calcite Rock (CaCO3)

Quartz with Mica/Chlorite inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Smoky Quartz (Chlorite Inclusions)

Silicon Dioxide (SiO2) with trace Aluminum and Natural Irradiation

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Pegmatite with Smoky Quartz and Feldspar

Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8)

Quartz (Chert/Chalcedony variant)

Silicon dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Quartz (Chert/Chalcedony flake)

Silicon Dioxide (SiO2)

Desert Rose

Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O) or Barite (Barium Sulfate, BaSO4)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide with Iron Oxide (SiO2 with traces of Fe2O3/FeO(OH))

Milky Quartz

Silicon Dioxide (SiO2)

Specular Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Limonite-pseudomorph after Pyrite (Prophecy Stone)

Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Oxides

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Potassium Feldspar (Orthoclase)

KAlSi3O8 (Potassium Aluminum Silicate)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Banded Agate (specifically Chalcedony nodule)

Agate (Silicon Dioxide, SiO2)

Chrysoprase

Silicon dioxide with nickel impurities (SiO2 + Ni)