Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
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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Travertine
Travertine (a terrestrial form of Limestone, CaCO3)
sedimentary
Anthracite Coal
Anthracite
metamorphic
Kyanite
Kyanite (Al2SiO5)
mineral
Slate with Quartz Vein
Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)
metamorphic
Hypersthene
Hypersthene (Enstatite variety), (Mg,Fe)SiO3
Mineral
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
mineral (impactite)
Sandstone (with possibly iron oxides and other minerals)
Sandstone
Sedimentary rock
Bivalve Fossil (Clam/Mollusk)
Class: Bivalvia (Order: Veneroida), Calcium Carbonate (CaCO3)
sedimentary
Black Opal
Amorphous hydrated silica (SiO2 nH2O)
mineral
Green Tiger's Eye
Silicified Crocidolite (Quartz variety, SiO2)
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Black Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Libyan Desert Glass
Libyan Desert Glass (Impactite / High-silica Lechatelierite)
mineral
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Bauxite
Aluminium ore consisting largely of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH)
sedimentary
Orthoclase Feldspar (Salmon variety)
Orthoclase, KAlSi3O8
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Serpentinite (often containing Jadeite/Nephrite)
Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4
metamorphic
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide); NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Nephrite Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Metamorphic
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Libyan Desert Glass
Libyan Desert Glass (Impactite)
meteorite
Libyan Desert Glass
Natural Silica Glass (SiO2 with minor iron and titanium)
mineraloid
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Yellow Sapphire
Corundum (Al2O3)
mineral
River Cobble (Quartzite or Weathered Sandstone)
Arenite / Metasandstone (SiO2)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Garden Pebble (Quartzite or Limestone fragment)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment
sedimentary
Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
igneous and metamorphic
Orange Quartz with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate hydroxide (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
mineral
Rough Ruby (Corundum) in Zoisite Matrix
Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)
mineral
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Slate
Foliated Metamorphic Rock (composed primarily of silica and alumina with iron and magnesium)
metamorphic
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Ruby in Zoisite
Ruby (α-Al2O3) embedded in Zoisite (Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (composed of multiple minerals)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rainbow Moonstone (White Labradorite)
White Labradorite (Feldspar variety, (Na,Ca)(Al,Si)4O8)
mineral
Quartz (specifically Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral