Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (CaCO3)
sedimentary
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
Prasiolite (Green Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Pink Quartzite
Quartzite (primarily SiO2)
metamorphic
Lapis Lazuli
Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Yellow Quartzite (River Cobble)
Quartzite (mainly SiO2)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Charoite
Charoite (Hydrated potassium, sodium, calcium, barium, strontium silicate hydroxide fluoride)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Red Quartzite / Ferruginous Quartzite
Quartzite (primarily SiO2 with Fe2O3 inclusions)
metamorphic
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Nephrite Jade (River Bed Pebble)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Light Grey / Flint variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Smoky Quartz (with possible Feldspar inclusions)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz in Matrix
Silicon dioxide (SiO2) within Pegmatite/Gneiss
igneous
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide); NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Aquamarine
Beryl (Be₃Al₂Si‑₆O₁₈)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium aluminum silicate)
mineral
Schorl (Black Tourmaline)
Sodium Iron Aluminum Borosilicate Hydroxide; NaFe2+3Al6Si6O18(BO3)3(OH)3OH
mineral
Moonstone (specifically Rainbow Moonstone / White Labradorite)
White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)
mineral
Black Opal
Hydrated Silica (SiO2·nH2O)
mineral
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Mineral
Siltstone
Siltstone (primarily composed of SiO2 with various clay minerals)
sedimentary
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz grains)
sedimentary
Mica Schist
Mica Schist (Quartz-Biotit-Muscovite Schist)
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Shale creek bed
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Anthracite
Anthracite Coal
sedimentary
Serpentine
Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)
Metamorphic rock
Ferruginous Sandstone
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Chert (Common Variety, Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper and Quartz River Pebble
Silicon Dioxide (SiO2) with impurities
sedimentary