River Pebbles and Quartz
Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)
mixed
Category
Mixed (Igneous, Sedimentary, Metamorphic, And Minerals)
Browse mixed (igneous, sedimentary, metamorphic, and minerals) specimens identified by the Rock Identifier community.
Learn about Mixed (Igneous, Sedimentary, Metamorphic, And Minerals) in the encyclopedia
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Pink and Green Tourmaline (Tumbled)
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Mixed polished river stones
Likely quartz, quartzite, chert/jasper, and possibly limestone or marble
mineral
Chakra Crystal Bracelet
Mixed Mineral Assortment
gemstone
Mixed rock fragments, likely granite and weathered metamorphic rock
Granite (quartz–feldspar–mica aggregate) with probable schist/gneiss fragments
igneous and metamorphic
Mixed Rock Collection
Polylithic Geological Specimen Mix
sedimentary and igneous
Greenstone / Diorite
Intermediate plutonic igneous rock
igneous
Granite Pebble
Granite (composed primarily of Quartz, Potassium Feldspar, Plagioclase, and Biotite/Amphibole)
igneous
Granodiorite (Weathered)
Granodiorite
igneous
Beach Pebbles and Quartz Aggregates
Quartz pebbles and biogenic fragments (SiO2, CaCO3)
sedimentary
Mixed river stones and gravel
Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate
igneous, sedimentary, metamorphic
Migmatite
Migmatite (Mixed metamorphic-igneous rock)
metamorphic
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Yellow Ochre (Limonite)
Limonite (FeO(OH)qnH2O)
sedimentary
Granite Pebble
Granite
igneous
Granite
Intrusive Igneous Rock
igneous
Bauxite
Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)
sedimentary
Graphite
Graphite (Carbon, C)
Mineral
Quartz with impurities or Host Rock
SiO2 (Silicon Dioxide) with mixed silicates
mineral
Mixed river-worn rock collection
Uncertain; likely quartzite, sandstone, basalt, and weathered granite or gneiss
igneous, sedimentary, metamorphic
Granite Pebble
Intrusive Igneous Rock (Felsic to Intermediate)
igneous
Sandstone with Desert Varnish
Arenite with Ferromanganese patina
sedimentary
Venetian Gold Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Quartz with Chlorite / Greenschist
Quartz vein in Greenschist (SiO2 with Chlorite group minerals)
metamorphic
Pink granite
Coarse-grained granitic rock, chiefly orthoclase microcline feldspar, quartz, and dark biotite/amphibole
igneous
Pegmatite with Lepidolite and Feldspar
Pegmatite (containing K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 and KAlSi3O8)
igneous
Mixed Gemstone and Mineral Collection
Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)
mineral
Eudialyte
Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)
mineral
Mineral and Rock Collection (Assorted)
Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine
mineral
Unidentified weathered rock fragments
Likely mixed silicate rocks; specific identification requires testing
mineral
Quartz with Inclusions
Silicon Dioxide (SiO2)
mineral
Epidote in Matrix (Unakite-like Rock Fragment)
Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) / Altered Metamorphic Pebble
metamorphic
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Sodalite and Calcite
Na8(Al6Si6O24)Cl2 (Sodalite) and CaCO3 (Calcite)
mineral
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Quartz Vein in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Pink Granite
Granite (Phaneritic Acidic Igneous Rock)
igneous
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Fuchsite on Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) with Chromium impurities
metamorphic
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous