Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Category
Mixed (Sedimentary, Igneous, And Metamorphic)
Browse mixed (sedimentary, igneous, and metamorphic) specimens identified by the Rock Identifier community.
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Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) with polymer resins
Sedimentary-like (Industrial Composite)
Pink Granite
Granite (Felsic Plutonic Igneous Rock)
igneous
Magnetite
Magnetite (Fe3O4)
mineral
Pink Granite
Phaneritic intrusive igneous rock with dominant Alkali Feldspar
igneous
Schist (Micaceous Schist)
Micaceous schist (Mainly Muscovite/Biotite mixed with Quartz)
metamorphic
Pink Granite
Felsic Plutonic Rock (Granite)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)
Igneous
Fossiliferous Limestone
Limestone (CaCO3 with Limonite/Goethite staining)
sedimentary
Pink Granite (Crystalline Granite)
Igneous Intrusive Rock (Felsic Plutonic)
igneous
Mixed Gemstones and Minerals
Mixed Silicates and Oxides (Quartz/Amethyst, Aventurine, Sodalite, Chert, Jasper)
mineral
Carnelian and Mixed Agates
Cryptocrystalline Quartz (SiO2 with Iron Oxide impurities)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone and Mixed Rock Assemblage
Clastic Sedimentary Rock / Quartz Arenite
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Feldspar (Plagioclase / Potassium Feldspar)
Feldspar Group (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)
Mineral-based Sedimentary/Silica
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Mixed Polished Gemstones (Tumbled Stones)
Mixed Silicates and Oxides (SiO2, KAlSi3O8, Ca2Al2Be3Si6O22, etc.)
mineral
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Pyrite Cube in Matrix
Iron Sulfide (FeS2)
mineral
Pegmatite with Quartz and Feldspar
Intrusive Igneous Rock
igneous
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Mixed tumbled stone collection
Assorted minerals, likely including quartz, jasper, agate, and possibly obsidian or hematite
mineral
Raw tourmaline crystal (probable schorl)
Tourmaline group; likely schorl, NaFe3+Al6(BO3)3Si6O18(OH)4
mineral
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Tumbled rhodonite
Rhodonite, manganese inosilicate (MnSiO₃), commonly mixed with quartz and manganese oxides
metamorphic
Banded Iron Formation (Jaspilite / Hematite Jasper)
SiO2 + Fe2O3 (Quartz with Hematite/Magnetite)
sedimentary
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Apatite
Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Petrified Wood and Mixed Rocks
Silicified Wood (SiO2)
fossil
Rhodonite
Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3
mineral
Mixed rock and mineral collection
Multiple specimens; visible examples may include quartz (SiO₂), amethyst (quartz), calcite (CaCO₃), and dark mafic rocks
mineral
Yellow Quartz (Citrine Quartz / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite: Na8(Al6Si6O24)Cl2
mineral
Tiffany Stone
Fluorite-bearing Opalized Breccia
Rock/Mineralized Nodule
Pea Gravel / River Gravel
Unconsolidated Clastic Sedimentary Aggregate
sedimentary
Colorless faceted gemstone (likely cubic zirconia)
Cubic zirconia, zirconium dioxide (ZrO₂); possibly synthetic quartz or glass imitation
gemstone