Granite (Pink/Red Orthoclase variety)
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
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.
Yellow Quartz (Citrinated Quartz)
Silicon Dioxide (SiO2)
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Emerald
Emerald (Beryl variety); Be3Al2(SiO3)6 with Chromium/Vanadium impurities
mineral
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Smoky Quartz
Quartz (SiO₂)
Mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Iridium sand or Osmium-Iridium nugget
Iridosmine / Osmiridium (Platinoid grouping)
mineral
Quartz (River Pebble)
Quartz (Silicon Dioxide - SiO2)
mineral
Chalcedony (Botryoidal Agate vein)
Chalcedony (Microcrystalline Quartz) - SiO2
mineral
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Diorite (River Pebble)
Phaneritic Intermediate Plutonic Rock (Diorite)
igneous
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Dyed Agate
Silicon Dioxide (SiO2) with synthetic dyes
mineral
Agate (specifically Botswana or Lake Superior style Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Concrete with Aggregate
Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)
anthropogenic (human-made) sedimentary-like material
Chert (Jasper)
Microcrystalline Silica (SiO2)
sedimentary
Basalt River Stone
Basalt
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Diamond
Diamond (C)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Jasper/Agate variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Felsic Intrusive Igneous Rock
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide) - SiO2
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Limonite (Ironstone Concretion)
Limonite (Hydrous Ferric Oxides mixed with Goethite)
sedimentary
Kimberlite
Kimberlite
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Celestine (or Celestite) on Matrix
Celestine (SrSO4)
mineral
Shale with Iron Oxide Staining
Fissile Mudstone (primarily clay minerals and quartz)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Quartz Druze on Matrix (Geode Fragment)
Quartz (Silicon Dioxide, SiO2)
mineral
Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)
Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Fossiliferous Shale (with Vertebrate Bones)
Laminated Mudstone containing Fossilized Bone (Apatite)
sedimentary
Ironstone (with possible Hematite/Limonite coating)
Ironstone (Fe-rich sedimentary rock)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)
sedimentary