Sandstone (Ferruginous)
Arenite (with Iron Oxides)
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.
Gold Flakes
Native Gold (Au)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Greenstone (Metabaltic/Greenschist)
Chlorite schist / Meta-basalt
metamorphic
Chert
Chert (Silicon Dioxide, SiO2)
sedimentary
Emerald (Beryl)
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Chert (Field Stone)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Peridot
Olivine (specific variety: gem-quality forsterite), (Mg,Fe)2SiO4
Mineral
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Smoky Quartz (Tumbled)
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Granite (Weathered River Rock)
Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Limonite (with goethite)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Basalt
Basalt (dominated by Plagioclase Feldspar and Pyroxene)
igneous
Ferruginous Sandstone (Ironstone)
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Jasper with Pyrite (Gold-colored inclusions)
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions
sedimentary (chemical/biological)
Orca Agate (Blue Chalcedony)
Silicon Dioxide (SiO2)
mineral
Garnet (likely Almandine or a blend)
Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.
Mineral
Blue Sapphire (Ceylon)
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Granite
Phaneritic plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Unakite (or Epidotized Granite)
Epidotized Granite (Composition: KAlSi3O8, Ca2(Al,Fe)3(SiO4)3(OH), SiO2)
metamorphic
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with included minerals (Fuchsite for green)
Metamorphic Rock / Mineral (Quartz Variety)
Red Jasper (Brecciated Jasper)
SiO2 (Silicon Dioxide) with Ferric Iron inclusions
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Pink Banded Onyx (Mexican Onyx / Calcite)
Calcite (CaCO3) - microcrystalline calcium carbonate
sedimentary
Galena
Lead(II) sulfide (PbS)
mineral
Banded Agate (specifically Mexican Lace Agate variety appearance)
Silicon Dioxide (SiO2 / Chalcedony)
mineral
Banded Agate (Yellow Agate)
Silicon Dioxide (SiO2)
mineral
Quartzite Cobble / Quartzite Pebble
Quartzite (SiO2)
metamorphic
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
mineral
Quartzite Pebble (River Rock)
Quartzite (SiO2)
metamorphic
Pink Granite (Gneissic Granite)
Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)
igneous
Opalite
Synthetic Fluorescent Glass (SiO2 + impurities)
mineraloid (synthetic)
Chert (Arrowhead Preform)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxide
mineral
Opalite
Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Stone)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Jasper River Pebble
Jasper (Silicon Dioxide, SiO2)
sedimentary (cryptocrystalline quartz)
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral