Diorite
Intermediate Phaneritic Igneous Rock
igneous
Category
Mixed (Predominantly Sedimentary And Igneous)
Browse mixed (predominantly sedimentary and igneous) specimens identified by the Rock Identifier community.
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Granite (Pink/Red)
Phaneritic Igneous Rock (Rich in K-Feldspar)
igneous
K2 Jasper (K2 Granite)
Azulite in Granite (Quartz + Feldspar + Biotite + Azurite)
igneous
Mineral and Rock Collection (Assorted)
Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine
mineral
River gravel and cobbles
Mixed alluvial clasts, likely including granite, basalt, quartzite, and sandstone
sedimentary
Leopard Skin Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Graywacke
Graywacke Sandstone
sedimentary
Amethyst
Amethyst (SiO2 - Silicon Dioxide with iron impurities)
mineral
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Epidote in Quartz
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH)) / Quartz (SiO2)
metamorphic
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Epidote (Unakite variety)
Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Polished brown jasper
Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich variety
mineral
Amazonite (Microcline Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Polygenetic Conglomerate (Puddingstone)
Conglomerate (SiO2 matrix with mixed clasts)
sedimentary
Gossan (Iron Cap)
Limonitic Gossan (Fe2O3·nH2O mixed)
sedimentary
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Mixed Mineral Bead Bracelet
Polycrystalline and Monocrystalline Silicates/Oxides (Quartz, Howlite, Hematite)
gemstone
Epidote in Matrix (Unakite-like Rock Fragment)
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) / Altered Metamorphic Pebble
metamorphic
Dalmatian Jasper (Dalmatian Stone)
Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)
igneous
River-rounded landscaping pebbles
Mixed alluvial gravel; commonly quartzite, granite, basalt, sandstone, and quartz
sedimentary
Gravel and Pebbles
Unconsolidated rock fragments (clastic sediment)
sedimentary
Mookaite Jasper
Silicified radiolarite (SiO2)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Graphite
Graphite (Native Carbon, C)
metamorphic
Polymictic conglomerate
Lithified polymictic conglomerate; clasts likely quartzite, granite, and volcanic rock in a dark matrix
sedimentary
Bauxite (Iron-stained Chert / Ironstone Aggregate)
Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Granite Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Gabbro
Gabbro
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock
igneous
Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Unidentified polished stone fragments
Indeterminate; likely mixed lapidary specimens, possibly jasper, agate, or quartz-bearing rock
mineral
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Conglomerate
Conglomerate (Clastic sedimentary rock)
sedimentary
Amethyst with Marcasite accents
Amethyst (Silicon Dioxide SiO2) and Marcasite (Iron Sulfide FeS2)
mineral
Jasper-Quartz Conglomerate / Chert
Siliceous Sedimentary Rock (SiO2)
sedimentary
Jasper Rose Quarts / Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary