Sunstone
Plagioclase feldspar (with Copper or Hematite inclusions)
mineral
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
Learn about Metamorphic Or Sedimentary Depending On Local Grade in the encyclopedia
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Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Jadeite (Nephrite-Jadeite blend)
Jadeite (NaAlSi2O6)
metamorphic
Amethyst Geode
Amethyst (Silicon Dioxide, SiO2)
mineral
Yellow Jasper
Jasper (Silicon Dioxide with Iron Oxide impurities, SiO2)
sedimentary
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gold Ore
Native Gold (Au)
mineral
Citrine
Silicon Dioxide (SiO₂)
mineral
Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)
Jadeite (NaAlSi2O6), Corundum (Al2O3), Beryl (Be3Al2(Si6O18))
mineral
Labradorite (likely)
(Ca,Na)(Al,Si)4O8
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gossan (Iron Hat)
Limonitic Gossan (Fe-oxide/hydroxide complex)
igneous
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with included minerals (Fuchsite for green)
Metamorphic Rock / Mineral (Quartz Variety)
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper/River Stone)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Tiger's Eye
Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2
mineral
Black Sand (Magnetite Sand)
Magnetite (Fe3O4)
mineral
Dyed Magnesite (Howlite imitation)
Magnesium carbonate (MgCO3) with dye
mineral
Anthracite Coal
Anthracite
sedimentary
Anthracite Coal
Anthracite (Carbon-rich Sedimentary Rock)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Fossiliferous Limestone (Coral Fossil)
Scleractinian Coral in Calcium Carbonate (CaCO3)
sedimentary
Red Garnet (Pyrope or Almandine)
Garnet Group (A3B2(SiO4)3)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Serpentine Jade (New Jade/Olive Jade)
Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite
Mineral
Green Aventurine
Aventurine (variety of Quartz - SiO2)
Mineral_Rock
Orange Calcite (likely polished specimen)
Calcite
Mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Asphalt (Bituminous Concrete)
Bituminous mix containing aggregates and petroleum-based binder (CnH2n+2)
not a rock (anthropogenic material/technofossil)
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Conglomerate
Clastic Sedimentary Conglomerate
sedimentary
Yellow Sapphire
Corundum (Al2O3) with iron impurities
mineral
Turquoise (likely Sleeping Beauty variety or treated Howlite imitation)
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Agate with Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Purple Jasper
Silica-rich Microcrystalline Quartz (SiO2)
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
sedimentary
Greenstone / Greenstone Pebble
Greenschist (metamorphosed basalt or gabbro)
metamorphic
Quartzite Pebble
Quartzite (composed primarily of SiO2)
metamorphic