Unidentifiable Rock Fragment
Uncertain
Category
This Image Does Not Display A Rock, Mineral, Or Geological Specimen. It Shows A Human Hand Wearing A Ring.
Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Scoria
Scoria (a vesicular basalt or andesite)
igneous
Carnelian Agate
Carnelian (SiO2 with iron oxide impurities)
mineral
Chalcedony (Botryoidal/Agate nodule)
Microcrystalline Quartz (SiO2)
mineral
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Gold Ore in Matrix
Native Gold (Au) in Quartz/Host Rock
mineral
Gold (in Opaque Matrix/Jewelry)
Native Gold (Au)
mineral
Jade
Jadeite or Nephrite
Mineral/Mineraloid
Granite (Weathered)
Grano-diorite / Granite (SiO2 rich intrusive rock)
igneous
Banded Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz (on matrix)
Quartz (Silicon Dioxide, SiO₂)
Mineral
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Undetermined Due to Blur (Possible Flesh-Tone Mineral)
Unknown (Insufficient Visual Clarity)
Mineral
Sandstone with Quarzite clasts
Arenite (SiO2 based)
sedimentary
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Sandstone
Arenite (primarily SiO2)
sedimentary
Gastropod Fossil (Snail Internal Mold)
Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Granite Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).
Galena (PbS)
mineral
Carnelian
Carnelian (Chalcedony / SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
sedimentary
Carnelian
Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)
mineral
Granite (likely a river or beach pebble)
Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)
Igneous
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Granite Pegmatite
Phaneritic Plutonic Igneous Rock
igneous
Agate
Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony
Mineral
Carnelian (Orange Chalcedony)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Granite
Phaneritic Plutonic Felsic Rock (K-Feldspar + Quartz + Plagioclase)
igneous
Granite (Dioritic or Hornblende-rich)
Phaneritic Plutonic Felsic to Intermediate Igneous Rock
igneous
Amethyst
Quartz variety; SiO2 (Silicon Dioxide)
Mineral
Wonderstone
Banded Rhyolite (SiO2 with impurities)
igneous
Unable to Identify (Image Obscured)
Indeterminate
Sandstone (Weathered Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Sedimentary Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Granite Thin Section
Granitic rock (Phaneritic texture)
igneous
Sandstone (Pet Rock)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Botryoidal Chalcedony with Calcite
Chalcedony (SiO2 with accessory minerals, likely CaCO3)
Mineral
Basalt with Vesicular Surface
Basalt (Mafic Extrusive)
igneous