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 and Mineral Collection
Various geological specimens
igneous, sedimentary, and metamorphic
Gravel and Sand Aggregate
Unconsolidated Clastic Sediment
sedimentary
Asphalt fragment
Bituminous concrete
anthropogenic material
Polished decorative stone spheres
Mixed material; individual spheres may be agate, jasper, quartz, or other ornamental 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
Crushed Stone / Gravel
Aggregate (mixed lithology)
sedimentary
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
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
Granite or Granitic Gneiss
Granitoid / Gneiss
Igneous / Metamorphic
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
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
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
Unidentified gravel and stone fragments
Mixed, indeterminate lithologies; likely quartz, feldspar, and weathered silicate rock fragments
sedimentary
Polished agate or jasper cabochon
Cryptocrystalline quartz, SiO₂, possibly iron-rich jasper inclusions
gemstone
Dark gray weathered pebble, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides
igneous
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Polished carnelian agate
Microcrystalline quartz (SiO₂), chalcedony with iron-oxide coloration
mineral
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
Sodalite
Na8Al6Si6O24Cl2
mineral
Smoky Quartz with Feldspar
SiO2 (Quartz) with KAlSi3O8 (Feldspar)
mineral
Mixed Mineral Collection
Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)
mineral
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Granite or Pegmatite with Quartz and Feldspar
Granitoid
igneous
Weathered quartz-rich pebble
Likely quartz-rich granitoid (quartz and feldspar); exact identification is uncertain from the image
igneous
Weathered conglomeratic volcanic rock
Likely basaltic volcanic breccia or agglomerate, with plagioclase, pyroxene, volcanic glass, and lithic fragments
igneous
Glacially transported granite and gneiss boulders
Granite (quartz–feldspar–mica); banded specimens likely gneiss
igneous and metamorphic
Mixed Tumbled Rocks and Minerals Collection
Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)
mineral
Asphalt
Asphalt concrete
sedimentary
Tiffany Stone
Fluorite-bearing Opalized Breccia
Rock/Mineralized Nodule
Asphalt (Bituminous Rock)
Natural bitumen or Bituminous limestone/sandstone
sedimentary
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral