Gneiss
High-grade Metamorphic Gneiss
metamorphic
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
Learn about Mineralogical Specimen in the encyclopedia
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Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Granitoid (Granite/Granodiorite)
Plutonic igneous rock (variable composition, primarily SiO2)
igneous
Fluorite with Quartz coating
Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (Smoky/Milky variant)
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Stone/Ocher)
Limonite (FeO(OH)·nH2O)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Amber with inclusion
Amber (Fossilized Tree Resin)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (River Cobble)
Silicon Dioxide (SiO2)
mineral
Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with fossil inclusions
sedimentary
Calcite with iron staining
Calcium Carbonate (CaCO3)
mineral
Fossiliferous Limestone
Autochthonous Biogenic Sedimentary Rock (CaCO3)
sedimentary
Calcite with Quartz coating
Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2)
mineral
Quartzite Cobble with Quartz Vein
Metamorphic Quartzite (SiO2)
metamorphic
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (with Lichen)
Arenite (composed primarily of SiO2)
sedimentary
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Limestone (Ocherous)
Calcium Carbonate (CaCO3) with Iron Oxide (Limonite)
sedimentary
Chert (Jasper/Agate variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert with Quartz Vein
Microcrystalline Quartz (SiO2) with Macrocrystalline Quartz
sedimentary
Fossiliferous Limestone with Rugose Coral
Lithostrotionella (Limestone Matrix - CaCO3)
sedimentary
Granite
Phaneritic Igneous Rock (Granite)
igneous
Ferruginous Quartzite (Red Quartz)
Quartzite (SiO2 with Hematite/Iron impurities)
metamorphic
Agate (Plume/Moss variety)
Cryptocrystalline Quartz (SiO2) with iron/manganese inclusions
mineral
Fancy Jasper
Silicon Dioxide (SiO2) with impurities
mineral
Agate
Chalcendony (Silicon Dioxide, SiO2)
mineral
Quartzite Cobble
Metamorphic Quartzite (SiO2)
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Crinoid Fossil Marble
Crinoidal Limestone / Phylum Echinodermata
sedimentary
Ferruginous Sandstone (with ripple marks)
Arenite with Iron-Oxide (Fe2O3) cement
sedimentary
Quartzite (River Stone)
Quartzite (SiO2)
metamorphic
Fossiliferous Limestone (Shell Fragment)
Biogenic Limestone (Calcium Carbonate / CaCO3)
sedimentary
Amygdaloidal Basalt with Quartz/Zeolite Infill
Amygdaloidal Basalt (extrusive volcanic rock with SiO2 or CaAl2Si3O10·3H2O infill)
igneous
Gold Ore (in Quartz/Pyrite)
Native Gold (Au) with Quartz (SiO2) and Pyrite (FeS2)
mineral
Placer Gold Nugget
Native Gold (Au)
mineral
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Porphyritic Basalt (with Amygdules)
Amygdaloidal Porphyritic Basalt
igneous