Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
gemstone
Category
Mineral_rock
Browse mineral_rock specimens identified by the Rock Identifier community.
Learn about Mineral_rock in the encyclopedia
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Quartz with Calcite / Geode Fragment
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)
mineral
Bicolor or Tricolor Tourmaline
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Weathered mafic rock, likely basalt or greenstone
Fine-grained basaltic rock; possibly altered basalt (metabasalt/greenstone)
igneous
Chert (Sedimentary Rock)
Silicon Dioxide (SiO2)
sedimentary
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
Iron-Stained Quartz (Red Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Green Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Quartzite Pebble
Metamorphic Rock (rich in SiO2)
metamorphic
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Native Copper in Basalt
Amygdaloidal Basalt with Native Copper (Cu)
metamorphic
Smoky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Fossilized Bone Fragment
Vertebrate Fossil Material (Apatite/Calcium Phosphate)
fossil
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Amazonite
Amazonite (Microcline Feldspar) - KAlSi3O8
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Pyrite Schist
Metamorphic rock containing FeS2 (Pyrite) with mica and quartz
metamorphic
Labradorite (Raw)
(Ca, Na)(Al, Si)4O8
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Granite
Felsic intrusive igneous rock
igneous
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Likely weathered iron-rich rock
Probable basalt or limonite/goethite-stained mafic rock; exact identification requires testing
igneous
Red Sandstone
Arenite (typically with iron oxide/hematite cement)
sedimentary
Tiger's Eye (Brown/Golden)
Silicon dioxide (Quartz pseudomorph after crocidolite), SiO2
mineral
Bornite
Bornite (Cu5FeS4)
mineral
Limonite / Goethite pseudomorph
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Satin Spar (often marketed as Selenite)
Gypsum (CaSO4·2H2O)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Specular Hematite
Hematite (Fe2O3)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Basalt with Quartz/Calcite Veins
Extrusive mafic igneous rock with hydrothermal mineralization
igneous
Vesicular Basalt
Basalt with secondary mineral infilling (Amygdaloidal Basalt)
igneous
Gneiss
High-grade regional metamorphic rock
metamorphic
Granite
Phaneritic plutonic rock (Silica-rich)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Smooth river pebble
Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert
sedimentary
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic