Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Category
Mixed
Browse mixed specimens identified by the Rock Identifier community.
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Weathered quartz-rich pebble
Likely quartz-bearing granitoid or quartz-rich metamorphic rock; exact identification is uncertain from the image
igneous
Likely amphibolite
Amphibolite, composed chiefly of hornblende and plagioclase feldspar
metamorphic
Granitic Gravel and Soil
Regolith / Alluvial sediment
sedimentary
Mixed Pebbles
Polylithic Rock Fragments
sedimentary
Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
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
Soil with Mineral Detritus and Quartz Fragments
Regolith / Silicate Mineral Aggregate
sedimentary
Sodalite
Na8Al6Si6O24Cl2
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(5)nH2O
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Blue-green tumbled stone, possibly chrysocolla-bearing material
Uncertain from image; likely chrysocolla (hydrated copper silicate, variably written Cu₂H₂Si₂O₅(OH)₄·nH₂O), possibly mixed with quartz or other copper minerals
mineral
Polished carnelian agate
Microcrystalline quartz (SiO₂), chalcedony with iron-oxide coloration
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
River Pebble
Quartzite or mixed lithology rock
sedimentary
Landscape Pebbles
Mixed Quartz and Limestone Gravel
sedimentary
Chakra Crystal Pendant
Mixed Quartz and Chalcedony (SiO2)
gemstone
River Pebbles (Mixed Suite)
Mixed lithologies: Quartzite and Gneiss
metamorphic
River Pebble
Polished Quartzite or Mixed Lithology
sedimentary
Tumbled Gemstones Set
Mixed Quartz and Silicate Varieties
gemstone
Gravel (Crushed Stone Aggregates)
Mixed Siliciclastic / Carbonate Aggregate
sedimentary
Assorted rock and mineral specimens
Multiple unidentified specimens; individual mineral and rock names cannot be determined from this image
igneous
Amazonite
Microcline feldspar (KAlSi3O8)
mineral
Asphalt (Bituminous Rock)
Natural bitumen or Bituminous limestone/sandstone
sedimentary
Asphalt
Asphalt concrete
sedimentary
Tiffany Stone
Fluorite-bearing Opalized Breccia
Rock/Mineralized Nodule
Sea Glass
Man-made vitreous material
gemstone
Mixed Tumbled Rocks and Minerals Collection
Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)
mineral
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
Red Granite
Granite
igneous
Lapis Lazuli
Complex silicate rock (lazurite, calcite, pyrite)
metamorphic
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Crushed Granite and Quartz Gravel
Composite Igneous and Silicate Rock Aggregate
igneous
Quartz with Mica inclusions (Pegmatite)
Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions
igneous