Yellow Jasper
Chalcedony (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Category
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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.
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite (riebeckite) that have been altered to limonite and then replaced by quartz
Mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Laterite
Laterite (primarily composed of hydrated oxides of iron and aluminum)
Sedimentary Rock (as a residual soil/rock, it's often considered a type of sedimentary rock due to its formation from weathering, though it can cross into soil science)
Agate (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Amethyst (Tumbled)
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Tree Agate
Silicon Dioxide (SiO2) with Dendritic Inclusions
Mineral
Coquina
Bioclastic Limestone (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)
mineral
Diamond in Gold Setting
Diamond (C - pure carbon)
mineral
Dragon Blood Jasper
Epidote-rich Quartzite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
River Pebble (Greywacke or Quartzite-rich Sandstone)
Lithic Sandstone (primarily SiO2 with rock fragments)
sedimentary
Schist
Mica Schist (primarily consisting of muscovite, biotite, and quartz)
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Amethyst
Silicon dioxide (SiO2) containing traces of iron and manganese
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Amethyst
Quartz (SiO2) with trace iron impurities
Mineral
Yellow Quartzite (River Pebble)
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Chert (Common Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Flint variety)
Chert (SiO2)
sedimentary
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Fluorite Tower
Fluorite (Calcium Fluoride - CaF2)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
mineral
Dalmatian Stone
Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock)
igneous
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Turquoise (likely Stabilized or Dyed Howlite/Magnesite)
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Dragon Stone
Argillaceous Sedimentary Rock (Ohko Stone)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst (Faceted Gemstone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Chert (variously known as Flint or River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary