Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Category
Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite)
Browse metamorphic rock (for nephrite and some jadeite); mineral (for jadeite) specimens identified by the Rock Identifier community.
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Quartz Geode
Silicon Dioxide (SiO2) in Geode form
sedimentary
Basalt (Weathered/River worn)
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
igneous
White marble (likely calcitic marble)
Calcite-rich marble; primarily calcium carbonate, CaCO₃
metamorphic
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)
sedimentary
Quartz Geode (Cracked)
Crystalline Silicon Dioxide (SiO2)
mineral
Garnet Schist
Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Conglomerate
Sedimentary Conglomerate with Basaltic Clast
sedimentary
Gneiss (with Quartz Vein / Pegmatite Banding)
Metamorphic Gneiss
metamorphic
Quartz with Mafic/Chlorite Veins
Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining
metamorphic
Magnetite
Magnetite (Fe3O4)
Mineral
Red Jasper
Jasper (Silicon Dioxide with iron oxide inclusions), SiO2
mineral
Amygdaloidal Basalt
Vesicular-Amygdaloidal Basalt (Mafic Extrusive)
igneous
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically Granitic Gneiss)
Gneiss
metamorphic
Serpentinite (Serpentine Rock)
Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.
Metamorphic Rock
Sunstone
Oligoclase or Andesine (Plagioclase Feldspar) - (Ca, Na)((Al, Si)2Si2O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Red Jasper
Silicon dioxide (SiO2) with iron oxide (Fe2O3) inclusions
sedimentary/mineral
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Milky Quartz with Chlorite Schist Inclusions
Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)
metamorphic
Blue Apatite
Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)
mineral
Granite Gneiss
Granitic Gneiss
Metamorphic
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Feldspar (Plagioclase / Orthoclase)
KAlSi3O8 / CaAl2Si2O8 - NaAlSi3O8
mineral
Quartz (Milky / Clear Quartz Fragment)
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Pink Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Serpentine (serpentinite)
Serpentine-group minerals, chiefly antigorite, lizardite, and chrysotile: Mg₃Si₂O₅(OH)₄
metamorphic
Eye Agate
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
mineral
Quartz Geode
Crystalline Silver Oxide (SiO2) in Calcareous Host
mineral