Gold
Aurum (Au)
Mineral (Metal)
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.
Amethyst (Variety of Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Basalt Beach Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Red Jasper (possibly Agatized Jasper)
Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)
sedimentary
Chert / Flint Nodules in Sandstone
Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock
sedimentary
Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartz-rich Pebble)
Arenite (primarily SiO2)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Metal Alloy (Likely Pewter or Sterling Silver)
Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).
Man-made material (metal)
Glauconitic Sandstone (or Greensand)
Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Basalt
Aphanitic mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Quartzite
Quartzite
Metamorphic rock
Amazonite with Smoky Quartz and Feldspar
Microcline (KAlSi3O8) with Quartz (SiO2)
mineral
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Snowflake Obsidian (Flower Jasper variant)
Vitreous volcanic silicate with cristobalite inclusions
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diorite (weathered)
Intermediate plutonic igneous rock
igneous
Banded Iron Formation (BIF) / Tiger Iron variety
Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz - SiO2 + Fe2O3)
sedimentary
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Chrysoprase
Chrysoprase (a variety of Chalcedony, SiO₂)
Mineral
Quartz Druzy Geode
Silicon Dioxide (SiO2)
mineral
Rough Diamond
Diamond (pure carbon / C)
mineral
Quartzite Cobble
Metamorphic Quartzite (SiO2)
metamorphic
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2)
metamorphic
Banded Sandstone (Wonderstone)
Sandstone with Liesegang Rings (SiO2 with Iron Oxides)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Graywacke (River Cobble)
Graywacke (Lithic Sandstone)
sedimentary
Blue Apatite
Fluoroapatite (Ca5(PO4)3F)
mineral
Greenschist
Greenschist
metamorphic
Sandstone (Ferruginous)
Arenite (with high iron oxide content)
sedimentary
Optical Calcite (Iceland Spar)
Calcium Carbonate (CaCO3)
mineral
Sandstone (Ferruginous/Banded)
Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)
sedimentary
Ferruginous Sandstone (with ripple marks)
Arenite with Iron-Oxide (Fe2O3) cement
sedimentary
Iron Meteorite
Siderite (Iron-Nickel Alloy), predominantly Kamacite and Taenite (Fe, Ni)
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral