Green Aventurine and Clear Quartz
Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)
Mineral
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
Basalt (Porphyritic)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Coal (most likely Bituminous or Anthracite)
Bituminous Coal (Grade of Coal), Anthracite (Grade of Coal)
Sedimentary Rock
Shungite
Non-crystalline carbonoid (Shungite)
metamorphic
Jade (Nephrite or Jadeite)
Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 (amphibole mineral); Jadeite: NaAlSi2O6 (pyroxene mineral)
Metamorphic Rock / Mineral
Chert (Field Stone/Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Jasper and Basalt (Mixed Breccia or Chert)
Silicon Dioxide (SiO2) with Ferromagnesian silicates
sedimentary and igneous (mixed)
Soapstone
Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2(SiO3)6) with chromium/vanadium traces
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with trace Fe2+)
Mineral
Granite (weathered cobble)
Granite
igneous
Garnet Schist or Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Jasper
Silicon dioxide (SiO2)
sedimentary
Granite
Granite (a felsic intrusive igneous rock)
Igneous
Coquina or Fossiliferous Limestone
Fossiliferous Calcarenite (CaCO3)
sedimentary
Granite Cobble
Granite (Felsic Intrusive)
igneous
Pyrite
Iron Disulfide (FeS2)
mineral
Emerald
Beryl (Be3Al2Si6O18), specifically the green variety colored by chromium or vanadium
Mineral (Gemstone variety of Beryl)
Basalt with Secondary Mineralization (Likely Zeolites or Calcite)
Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)
igneous
Eclogite
Eclogite (Omphacite + Pyrope)
metamorphic
Quartzite
Hydrothermal Quartz or Quartzite (SiO2)
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (often called Flint or Jasper based on color)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Coquina
Biogenic Limestone (Calcite, CaCO3)
sedimentary
Limestone (specifically Grainstone or Micrite)
Calcium Carbonate (CaCO3)
sedimentary
Quartzite (Milky Quartz Cobble)
Silicon Dioxide (SiO2)
Metamorphic
Tiger's Eye (likely variant or dark tumble)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Cream Marble (Speckled)
Metamorphosed Limestone (mainly CaCO3)
metamorphic
Smoky Quartz in Matrix
Silicon dioxide (SiO2) within Pegmatite/Gneiss
igneous
Cat's Eye Moonstone (Simulated/Synthetic or natural Cat's Eye Quartz/Glass)
There is no single scientific name. The appearance suggests either: Moonstone (feldspar group), Cat's Eye Quartz (SiO2), Apatite (Ca5(PO4)3(F,Cl,OH)), or most likely a synthetic material such as Fiber Optic Glass or 'Opalite' (a type of glass).
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Mixed Gemstone Bracelet
Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)
Mineral/Rock assemblage
Dumortierite Quartz
Al7(BO3)(SiO4)3O3
mineral
Schorl (Black Tourmaline)
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Quartz-veined Schist (or Metasandstone)
Metamorphic Rock with Quartz Veining (SiO2)
metamorphic
Quartz / Iron-Stained Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions/staining
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Citrine-tinted)
Silicon Dioxide (SiO2)
mineral