Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Black Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Ironstone / Gossan with Quartz Inclusions
Limonite / Goethite rich Sandstone / Gossan
sedimentary
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Chert Conglomerate (Potomac Puddle Stone)
Sedimentary Conglomerate with Iron-Oxide matrix
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
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)
Citrine
Silicon dioxide (SiO2)
gemstone
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Serpentinite (often containing Jadeite/Nephrite)
Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4
metamorphic
Green schist (probable chlorite–actinolite schist)
Chlorite–actinolite schist; commonly composed of chlorite, actinolite, epidote, albite, and quartz
metamorphic
Galena
Lead Sulfide (PbS)
mineral
Glacial Erratic (Graywacke/Sandstone)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Quartzite River Cobble
Quartzite (SiO2)
metamorphic
Banded gneiss (likely garnet-biotite or quartz-feldspar gneiss)
Gneiss; predominantly quartz (SiO₂), feldspar, and dark biotite/amphibole
metamorphic
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz (Rose Quartz or Jasper variety)
Silicon Dioxide (SiO2)
mineral
Moqui Marry / Shaman Stone
Hematite-cemented Sandstone Concretion
mineral
Rough Ruby (Corundum) in Zoisite Matrix
Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Serpentinite-bearing quartz vein rock
Serpentinite (antigorite/lizardite) with milky quartz; possible chlorite or epidote alteration
metamorphic
Amphibolite
Amphibolite (rich in amphibole and plagioclase feldspar)
metamorphic
Quartz-rich metamorphic rock, possibly quartzite
Quartzite; primarily crystalline silicon dioxide (SiO₂), with minor feldspar, mica, or iron oxides
metamorphic
Black Tourmaline
Schorl (Sodium Iron Aluminum Borosilicate Hydroxide); NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Peach Moonstone
Potassium Aluminum Silicate (KAlSi3O8) with inclusions
mineral
Rounded white pebble, likely quartz or feldspar
Most consistent with milky quartz (SiO₂), though altered feldspar or calcite is possible from the image
mineral
Nephrite Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Metamorphic
Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
igneous and metamorphic
Gneiss
Gneiss (Metamorphic high-grade)
metamorphic
River Cobble (Quartzite or Weathered Sandstone)
Arenite / Metasandstone (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Schist (containing Muscovite Mica and Chlorite)
Mica Schist
metamorphic
Gneiss
Metamorphic Foliated Gneiss
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral