Citrine
Silicon dioxide (SiO2)
mineral
Category
Mineral (Specifically A Gemstone Variety)
Browse mineral (specifically a gemstone variety) specimens identified by the Rock Identifier community.
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Chalcedony
Chalcedony (SiO₂)
Mineral
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Garnet (Almandine variety)
Almandine, Fe3Al2(SiO4)3
Mineral
Orthoceras Fossil in Limestone
Orthoceras regulare (Class Cephalopoda; Order Orthocerida)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
African Turquoise
Teal Jasper (Macro-crystalline Quartz/Sio2 + Inclusions of Copper, Iron, and Manganese)
sedimentary
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Amphibolite (specifically Hornblende Schist/Gneiss)
Amphibole-rich Metamorphic Rock
metamorphic
Chalcedony (Banded/Mottled Variety)
Chalcedony (a cryptocrystalline variety of Quartz, SiO2)
Mineral
Gneiss (specifically a weathered or stream-worn specimen)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Yellow Jasper
Jasper (Silica-rich Microcrystalline Quartz, SiO2 with Iron impurities)
sedimentary
Chalcedony (Agate/Jasper mix in host rock)
Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)
mineral
Opalite
Synthetic Fluorescent Glass (SiO2 + impurities)
mineraloid (synthetic)
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
igneous
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Bowling Ball (Brunswick T-Zone Deep Space)
Polyester resin / Polyurethane polymer
Synthetic (not a natural rock)
Serpentine
Serpentinite (group of minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
mineral
Chert (variations include Flint/Chalcedony)
Chert (SiO2 - Silicon Dioxide)
sedimentary
Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
metamorphic
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (variety of Quartz)
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Beads (likely glass or man-made material)
N/A (artificial material)
Man-made material, not a natural rock or mineral specimen
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or iron oxide inclusions
sedimentary
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Hematite Beads
Hematite (Fe2O3)
Mineral
Banded Calcite (variety Honey Calcite / Chocolate Calcite)
Calcium Carbonate (CaCO3)
mineral
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Pink Granite
Granite (Alkali-feldspar granite)
igneous
Mahogany Obsidian Arrowhead
Obsidian (volcanic glass) with Hematite inclusions
igneous
Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)
Silicon Dioxide (SiO2) with iron inclusions
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary