Polished amethyst bead fragments
Amethyst, purple quartz (SiO₂)
gemstone
Category
Mixed
Browse mixed specimens identified by the Rock Identifier community.
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Mixed Rock Collection
Polylithic Geological Specimen Mix
sedimentary and igneous
Mixed Rock Collection
Polymineralic aggregate
sedimentary
Polished unakite pebble (likely)
Unakite: epidote, pink potassium feldspar, and quartz; composition varies
igneous
Mixed Rock and Mineral Collection
Various geological specimens
igneous, sedimentary, and metamorphic
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Asphalt fragment
Bituminous concrete
anthropogenic material
Mixed Rock Assortment
Polylithic geological specimens
sedimentary
Rock and Mineral Collection
Mixed Geological Specimens
mineral
River Rock
Mixed lithology clast
sedimentary
General river rock or weathered cobble
Mixed rock composition
igneous/metamorphic
Carved Stone Turtle
Mixed stone carving
carved stone
Chakra Crystal Bracelet
Mixed Mineral Assortment
gemstone
Migmatite
Migmatite (Mixed Rock)
metamorphic
Crushed Stone / Gravel
Aggregate (mixed lithology)
sedimentary
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Beach Pebbles and Shell Fragments
Polymictic Gravel and Bioclastic Sediments
sedimentary
Beach Pebbles and Shells
Mixed Lithology Sedimentary Clasts and Biogenic Carbonate
sedimentary
Mixed Rock and Mineral Collection
Multiple geological specimens
mineral
Mixed Tumbled Gemstones and Minerals
Various silicate and oxide minerals
mineral
Beach Pebbles and Quartz Aggregates
Quartz pebbles and biogenic fragments (SiO2, CaCO3)
sedimentary
Tumbled Mixed Gemstones and Rocks
Various mineral species including quartz (SiO2) and silicate minerals
mineral
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Quartz-rich rock fragment
Unidentified quartz–feldspar-rich rock; exact lithology cannot be determined from the image
igneous
Polished decorative stone spheres
Mixed material; individual spheres may be agate, jasper, quartz, or other ornamental minerals
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Crocodile Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Granite (likely)
Coarse-grained felsic intrusive igneous rock, principally quartz and feldspar with dark mica or amphibole
igneous
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Granite or Granitic Gneiss
Granitoid / Gneiss
Igneous / Metamorphic
River Pebbles
Polymictic Gravel
sedimentary
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Coarse sand with a small pebble
Unconsolidated siliciclastic sediment, chiefly quartz and rock fragments
sedimentary
Granite with Pegmatite Dike
Felsic intrusive igneous rock
igneous
Quartz-rich rock, likely granite or quartz-bearing metamorphic rock
Undetermined; possibly granitic rock composed mainly of quartz and feldspar, with mica or other dark minerals
igneous
Mixed stone-bead bracelet, likely agate/jasper and possibly sodalite or dyed quartz
Primarily microcrystalline quartz (SiO₂) varieties, with opaque iron-rich chalcedony/jasper and probable blue sodalite or dyed material
gemstone
Mixed Gemstone Rough
Various silicate and oxide minerals
mineral
Beach Pebbles and Jasper
Quartz / Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Fossil Assortment and Geological Specimens
Various (including Ammonoidea)
fossil
Red Jasper with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Gravel or Crushed Stone
Fragmented Aggregate Stone
sedimentary or igneous fragment