Orange Quartz / Peach Aventurine
Silicon Dioxide (SiO2)
mineral
Category
Igneous, Metamorphic, And Sedimentary (Mixed Assemblage)
Browse igneous, metamorphic, and sedimentary (mixed assemblage) specimens identified by the Rock Identifier community.
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Granite
Felsic intrusive igneous rock
igneous
Polygenetic Conglomerate (Puddingstone)
Conglomerate (SiO2 matrix with mixed clasts)
sedimentary
Gossan (Iron Cap)
Limonitic Gossan (Fe2O3·nH2O mixed)
sedimentary
Gravelly, weathered sediment (likely glacial till)
Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments
sedimentary
Pegmatite fragment
Granitic pegmatite, composed mainly of quartz, feldspar, and mica
igneous
Likely weathered granite or granitic gneiss
Granite: quartz + feldspar + mica; possibly gneiss if the faint banding is structural
igneous
Granite Pebble (Pegmatitic Quartz-Feldspar River Rock)
Granite / Quartz-Feldspar-Mica Aggregate
igneous
Red Granite
Granite (Felsic Plutonic Rock)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Greenstone (likely chlorite- or epidote-altered basalt)
Metamorphosed mafic volcanic rock; commonly chlorite–epidote–actinolite assemblage
metamorphic
Polished banded stone, likely gneiss
Banded gneiss (quartz–feldspar–mica assemblage; visual identification is provisional)
metamorphic
Weathered brown sandstone or quartzite cobble
Indeterminate sandstone; possibly quartz-rich quartzite
sedimentary
Gravel and Pavement Aggregates
Unconsolidated rock fragments / detrital sediments
sedimentary
Mixed landscaping gravel and rounded fieldstones
Lithologically mixed aggregate; likely quartzite, basalt, granite, and weathered sedimentary rocks
sedimentary
Quartz-rich feldspar rock, possibly pegmatitic granite
Granite or granitic pegmatite; mainly quartz (SiO₂) and feldspar, with possible mica
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 with Hematite/Magnetite inclusions)
igneous
Chert (with Epidote/Quartz veining)
Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions
sedimentary
Likely weathered limestone
Calcite-rich limestone (mostly CaCO₃), possibly dolomitic limestone
sedimentary
Jasp-Agate
Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions
sedimentary
Weathered sandstone or granitic rock fragment
Indeterminate siliciclastic rock; likely quartz–feldspar–mica aggregate
igneous
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Limonite
FeO(OH)•nH2O
mineral
Limonite
FeO(OH)·nH2O
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite Cube
Iron Sulfide (FeS2)
mineral
Feldspar
Feldspar (Orthoclase/Microcline)
mineral
Pyrite Nodules / Weathered Pyrite
Iron Sulfide (FeS2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Zoisite with Hornblende
Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions
metamorphic
Muscovite
KAl2(AlSi3O10)(OH)2
mineral
Quartz-rich conglomeratic breccia
Polymictic clast-supported conglomerate/breccia, dominated by quartz and feldspar
sedimentary
Unakite
Epidotized Granite
metamorphic
Banded gneiss
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2)
mineral
Granite
Coarse-grained felsic plutonic rock, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous