Granite
Granite (phaneitic intrusive igneous rock)
igneous
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Granite Gneiss
Felsic Gneiss (composed of Quartz, Feldspar, and Biotite)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Dragon Blood Jasper
Microcrystalline Quartz (Chalcedony) with Epidote and Piemontite
sedimentary
Granite
Intrusive igneous rock
igneous
Diorite Gneiss
Foliated Diorite Gneiss
metamorphic
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
igneous
Limonite (Ironstone Concretion)
Limonite (Hydrous Ferric Oxides mixed with Goethite)
sedimentary
Banded Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Dragon Blood Jasper
Quartz (SiO2) with Epidote and Piedmontite inclusions
sedimentary
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral
Limonite with Quartz
FeO(OH)·nH2O (Limonite) with SiO2 (Quartz)
mineral
Granite
Granite (Plutonic Igneous Rock)
igneous
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Granite (Alkali-feldspar, Quartz, and Plagioclase composition)
igneous
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
metamorphic
Tumbled Slate or Basalt Pebble
Metamorphic fine-grained rock / Slate or Phyllite
metamorphic
Cat's Eye Moonstone (Feldspar)
Orthoclase (KAlSi3O8) with Albite (NaAlSi3O8) inclusions
mineral
Jasper and Greenstone Pebble
Siliceous rock / Metamorphic pebble
metamorphic
Gabbro
Gabbro (composed mainly of calcium-rich plagioclase feldspar and pyroxene)
igneous
Gossan with Copper Carbonate (Chrysocolla/Malachite)
Ferruginous Oxide (Gossan) with Cu2CO3(OH)2 (Malachite) or (Cu,Al)2H2Si2O5(OH)4 (Chrysocolla)
Mineral/Sedimentary Interface
Weathered porphyritic volcanic rock
Likely andesite or dacite, with feldspar phenocrysts in a fine-grained groundmass
igneous
Unakite (likely)
Epidote–pink feldspar–quartz rock; commonly termed unakite
metamorphic
Dark mafic rock, likely basalt
Basalt; primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides
igneous
Porphyritic polymictic breccia (likely volcanic breccia)
Volcanic breccia; probable polymictic andesite–dacite breccia with quartz/feldspar clasts
igneous
Weathered iron-rich sandstone or ironstone cobble
Ferruginous sandstone/ironstone, chiefly quartz (SiO₂) cemented or stained by iron oxides and hydroxides
sedimentary
Serpentinized ultramafic rock with magnesite
Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with likely magnesite (MgCO₃) and minor chromite/magnetite
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Granite (Felsic intrusive igneous rock)
igneous
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2 with minor Fe2O3)
sedimentary