Gneiss
Gneiss (Metamorphic rock)
metamorphic
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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Garnet-Bearing Schist
Almandine Garnet Schist
metamorphic
Chrome Diopside
Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities
mineral
Green Tourmaline
Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)4)
mineral
Gneiss (River Cobble)
Metamorphic Gneiss
metamorphic
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Gneiss (Augen Gneiss)
Augen Gneiss
metamorphic
Tumbled Rose Quartz
Quartz (Silicon Dioxide, SiO2 with trace amounts of titanium, iron, or manganese)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Flint or chert nodule
Microcrystalline quartz (SiO₂), commonly chalcedony with possible opal and impurities
sedimentary
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Gneiss (Green Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Conglomerate
Conglomerate Rock
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
metamorphic
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Cubic Zirconia (simulant) or Diamond
ZrO2 (Cubic Zirconia) or C (Diamond)
gemstone
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
sedimentary
Greenschist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Garnet in Schist
Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)
metamorphic
Garnet Schist
Almandine-mica schist
metamorphic
Green Aventurine
Aventurine (Silicon dioxide, SiO₂)
Mineral; variety of Quartz
Optical Calcite
CaCO3 (Calcium Carbonate)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gastropod Fossil (Snail Stone or Steinkern)
Class Gastropoda (Calcium Carbonate - CaCO3 / Silica - SiO2 replacing original shell)
sedimentary
Coal (Anthracite)
Anthracite (Carbon-based organic sedimentary/metamorphic rock)
metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Schist
Schist (metamorphic rock)
metamorphic
Agate (Chalcedony)
Cryptocrystalline Silica or Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Mica Schist
Mica Schist (Silicate rock)
metamorphic
Gneiss
Gneiss (High-Grade Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Mica Schist (Garnetiferous)
Garnet-Mica Schist
metamorphic
Polished pink quartzite (likely with chlorite inclusions)
Quartzite; predominantly quartz (SiO₂), with minor chlorite or amphibole inclusions
metamorphic