Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Category
Mineral (Specifically, A Variety Of The Mineral Species Pyrope Almandine Garnet)
Browse mineral (specifically, a variety of the mineral species pyrope almandine garnet) specimens identified by the Rock Identifier community.
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Blue Lace Agate (Chert/Chalcedony)
Silicon dioxide (SiO2)
mineral
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
fossil
Granite
Granite (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase Feldspar)
igneous
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Sunstone
(Ca,Na)((Al,Si)2Si2O8) - Plagioclase Feldspar
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Buffalo Nickel (Indian Head Nickel)
Cupronickel (75% Copper, 25% Nickel)
mineral (processed alloy)
Milky Quartz
Silicon Dioxide (SiO₂)
mineral
Banded Agate (Onyx variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Super Seven (Melody Stone)
Quartz with inclusions (Amethyst, Cacoxenite, Goethite, Lepidocrosite, Rutile, Smoky Quartz, and Clear Quartz)
mineral
Limonite (often after Hematite or Goethite)
Limonite (FeO(OH)·nH2O)
mineral
Weathered iron-rich rock, likely limonite/goethite-bearing basalt or ironstone
Limonite (hydrated iron oxides; chiefly goethite, FeO(OH)) with probable silicate host rock
mineral
Amber (Burmite)
Fossilized tree resin (Succinite variant)
Organic mineraloid
Shark Tooth Fossil
Chondrichthyes (class) fossilized tooth
fossil
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Fossilized Bone
Permineralized Vertebrate Fossil
sedimentary
Jasper (specifically Owyhee or Picture Jasper variety)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Tumbled Moonstone
Feldspar (Orthoclase/Albite), KAlSi3O8
mineral
Satin Spar (Satin Spar Selenite)
Gypsum (CaSO4·2H2O)
mineral
Quartz-rich granitic pegmatite fragment
Pegmatite, composed mainly of quartz (SiO₂), feldspar, and mica
igneous
Muscovite Schist
Muscovite Schist (KAl2(AlSi3O10)(OH)2 matrix)
metamorphic
Moonstone
Orthoclase feldspar (KAlSi3O8)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Raw black tourmaline (likely schorl)
Schorl, a sodium–iron tourmaline; approximate formula NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Limonite/Goethite Iron Concretion
Hydrated iron oxide-hydroxide mixture (FeO(OH)·nH2O)
mineral
Black Veined Jasper (Spiderweb Jasper)
Silicon Dioxide (SiO2)
sedimentary
Banded Agate (specifically Carnelian Agate)
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond (Rough)
Diamond (C)
Mineral
Granite
Granitoid (composition typically SiO2, Al2O3, K2O, Na2O)
igneous
Agate (specifically a Blue Agate Geode Slice)
Chalcedony (cryptocrystalline variety of Quartz); SiO2
mineral
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Likely weathered metallic mineral or slag fragment
Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Serpentinite
Serpentinite (composed primarily of serpentine group minerals including antigorite, chrysotile, and lizardite)
metamorphic
K2 stone (azurite–granite)
Biotite granite hosting blue azurite (Cu₃(CO₃)₂(OH)₂), often with malachite and quartz
igneous
Tumbled Mixed Gemstones and Rocks
Various mineral species including quartz (SiO2) and silicate minerals
mineral