Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Mineral on Sedimentary Rock
Category
Sedimentary Rock Or Mineral (Depending On Origin And Purity)
Browse sedimentary rock or mineral (depending on origin and purity) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock Or Mineral (Depending On Origin And Purity) in the encyclopedia
View all →
Schist
Metamorphic Rock (Schist)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Quartzite Pebbler
Quartzite (primarily SiO2)
metamorphic
Pink faceted gemstone, likely synthetic ruby or pink sapphire
Corundum (Al₂O₃), possibly chromium-colored ruby; synthetic origin likely
gemstone
Quartz
Silicon dioxide (SiO2)
mineral
Granite
Intrusive igneous rock
igneous
Yellow Quartz (Chalcedony or Agate)
Silicon Dioxide (SiO2)
mineral
Likely weathered granite or granitic gneiss fragments
Granite: quartz–feldspar–mica aggregate; possibly biotite granite or weakly foliated gneiss
igneous
Possible black tourmaline (schorl)
Schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Sandstone (Pebble / Cobble)
Arenite / Sedimentary Rock (composed of quartz and feldspar)
sedimentary
Weathered Sedimentary Rock with Liesegang Rings
Sandstone or Siltstone with Iron Oxide Banding
sedimentary
Porphyritic volcanic rock (likely basaltic andesite)
Porphyritic basaltic andesite; exact identification requires testing
igneous
Rounded stream cobble
Lithology indeterminate; likely weathered sandstone, quartzite, or granitic rock
sedimentary
Note: Item is not a geological specimen
Guitar Components (Steel, Nickel, Plastic, Wood)
Synthetic/Consumer Product
Green serpentine (likely serpentine-rich stone)
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; composition approximately Mg₃Si₂O₅(OH)₄
metamorphic
River Rock
Polished Siliceous Rock / Quartzite Pebble
sedimentary
Quartz vein in host rock
Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist
metamorphic
Diamond
Diamond (pure Carbon, C)
mineral
Omarolluk (Omar)
Siliceous greywacke concretion
sedimentary
Jet
Lignite (Anthracite-grade compact coal)
sedimentary
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Sandstone (River Pebble)
Arenite (SiO2 based)
sedimentary
Native gold nugget or flake
Native gold (Au), possibly with minor silver/electrum
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Fossilized Coral
Rugosa / Scleractinia (Agatized or Calcitized Coral)
fossil
Fossilized Echinoid / Sea Urchin Internal Mold
Echinoidea internal cast (steinkern)
fossil
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Gravel and Pebbles
Unconsolidated rock fragments (clastic sediment)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary
Amber Dragonfly Brooch
Succinited (Baltic Amber)
fossil
Sandstone
Arenite (primarily SiO2)
sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Sandstone
Arenite
sedimentary
Blue sapphire ring
Corundum, Al₂O₃; blue color typically from trace iron and titanium
gemstone
Likely quartz cabochon in a ring
Quartz (SiO₂), possibly clear or milky quartz; identification is uncertain from the photograph
mineral
Mica Schist (with Muscovite mica)
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Quartz Crystal Rock
Silicon Dioxide (SiO2)
mineral
Faceted gemstone ring, likely smoky quartz or garnet in a metal setting
Not determinable from the photograph; possible quartz (SiO₂) or garnet-group silicate
gemstone
Sandstone
Clastic sedimentary rock composed mainly of quartz sand
sedimentary