Okenite
Okenite, Ca3Si6O15·6H2O
mineral
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
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Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Variscite (or potentially a turquoise/variscite matrix cabochon, or an impression jasper)
AlPO4·2H2O (Variscite) or related phosphate/silicate material depending on exact composition
Mineral
Tumbled Moonstone
Feldspar (Orthoclase/Albite), KAlSi3O8
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)
Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)
mineral
Rounded weathered rock, likely basalt or andesite
Fine-grained mafic to intermediate volcanic rock; precise identification requires testing
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chrysocolla on Quartz
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) with Quartz (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Diamond
Carbon (C) with trace Boron
mineral
Jadeite
NaAlSi2O6; Jadeite silicate mineral
metamorphic
Obsidian
Obsidian (Volcanic Glass, ~70% SiO2)
igneous
Quartz (Drusy/Crystalline)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)
mineral
Lazulite
Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2
mineral
Quartz-rich rock with chlorite/epidote vein
Milky quartz with green chlorite or epidote; exact identification requires testing
metamorphic
Geode
Silicon dioxide (Quartz/Chalcedony) concretion
sedimentary
Fossil Snail
Gastropoda (fossilized)
fossil
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Selenite
Gypsum (CaSO4·2H2O)
mineral
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, Limestone, and Barite)
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Likely porphyritic igneous rock (possibly granite or rhyolite)
Quartz–feldspar–mica aggregate; exact identification requires a fresh surface and tests
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
sedimentary
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Polished orbicular jasper (likely ocean jasper)
Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions
mineral
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Quartz in Matrix
Silicon Dioxide (SiO2) in host rock matrix
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Mica Schist
Mica Schist (Muscovite subclass)
metamorphic