Massive Quartz
Silicon Dioxide (SiO2)
mineral
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 →
Sandstone
Arenite (SiO2 based)
sedimentary
Dark rock specimen (possibly slate or shale)
Unidentified fine-grained rock; slate is foliated metamorphosed shale, while shale is sedimentary mudrock
metamorphic
Red gemstone, likely ruby
Corundum (Al₂O₃), colored red by chromium; identity cannot be confirmed from the photo
gemstone
Fossil Snail
Gastropoda (fossilized)
fossil
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartz-rich)
Arenite (composed mainly of SiO2)
sedimentary
Ruby and Diamond Heart Pendant
Corundum (Al2O3) and Diamond (C)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
sedimentary
Pearl (incorporated into jewelry)
Aragonite and Calcite (CaCO3)
mineral
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Small metallic-gold mineral fragment, possibly pyrite
Pyrite (FeS₂), if confirmed
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)
sedimentary
Blue crystal pendant (likely blue glass or synthetic crystal)
Not identifiable from the image; possibly synthetic quartz or glass, rather than a natural mineral
gemstone
Possible iron meteorite
Fe–Ni iron meteorite, possibly an ordinary chondrite or weathered iron-rich specimen
meteorite
Polished orbicular jasper pendant
Orbicular jasper (microcrystalline quartz/chalcedony, SiO₂)
sedimentary
Tumbled quartz-rich carbonate rock
Likely massive quartz (SiO₂), possibly calcite-bearing marble or limestone
mineral
Unknown Rock Fragment
Unknown
unknown
Yellow Ocher (Iron-rich Silt/Clay)
Goethite-rich Limonite (FeO(OH)qnH2O)
sedimentary
Not a rock, mineral, or geological specimen
N/A
Sedimentary Pebble
Sedimentary Rock Fragment
sedimentary
Gold Nugget
Gold (Au)
mineral
Druzy quartz specimen
Quartz, SiO₂, with possible iron-oxide staining and minor associated minerals
mineral
Tumbled pale agate or chalcedony
Microcrystalline quartz (SiO₂), likely agate/chalcedony
mineral
Rough Diamond
Diamond (Native Carbon, C)
mineral
Sandstone (likely Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Basalt (River Rock/Cobble)
Basalt (no specific mineral formula as it's a rock)
Igneous
Sandstone or Limestone
Arenite or Calcareous Sedimentary Rock
Sedimentary
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Sandstone Concretion
Sedimentary concretion
Sedimentary
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Shale
Argillite / Shale
sedimentary
Blue cabochon gemstone ring
Uncertain; likely blue sapphire (corundum, Al₂O₃), blue topaz, or synthetic glass/spinel
gemstone
Faceted clear gemstone, likely glass or cubic zirconia
Undetermined; could be synthetic cubic zirconia (ZrO₂) or cut glass (silica-based)
gemstone
Orange Calcite Sphere
Calcium Carbonate (CaCO3)
mineral
Banded Sedimentary Rock
Sedimentary Rock with Quartz/Feldspar Vein
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary