Banded 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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Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Polished/tumbled malachite–chrysocolla specimen (probable)
Malachite Cu2CO3(OH)2 with chrysocolla Cu2−xAlx(H2−xSi2O5)(OH)4·nH2O; possibly minor quartz or limonite
mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Yellow Quartz (Citrine Quartz / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Slate
Slate (Metamorphic rock)
metamorphic
Biotite schist (probable)
Mica schist; chiefly quartz, feldspar, and biotite mica
metamorphic
Ruby in Zoisite
Ruby (α-Al2O3) embedded in Zoisite (Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (composed of multiple minerals)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Quartzite River Cobble
Quartzite (SiO2)
metamorphic
Granitic gneiss
Banded quartz–feldspar–biotite gneiss; compositionally similar to granite
metamorphic
Gneiss
Gneiss
metamorphic
Iceland Spar (Optical Calcite)
Calcite (CaCO3)
mineral
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss with Quartz Vein
Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz (specifically Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Foliated Metamorphic Gneiss
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Crushed Limestone and Calcite
Calcium Carbonate (CaCO3)
sedimentary
Fossilized bivalve or brachiopod fragment
Indeterminate fossil shell, likely calcitic or aragonitic carbonate
fossil
Orange Quartz with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate hydroxide (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
mineral
Rounded quartz-rich pebble
Likely chert or quartzite; predominantly microcrystalline quartz (SiO₂)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Likely slate fragments
Slate, a fine-grained metamorphic rock composed chiefly of quartz, mica, and chlorite
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Polished tiger’s-eye
Tiger’s-eye quartz, chiefly SiO₂, with iron oxide (goethite/limonite) inclusions
metamorphic
Ruby (Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Weathered iron-rich rock, possibly limonite/goethite-bearing material
Limonite (hydrated iron oxides; commonly mixtures of goethite, hematite, and lepidocrocite)
mineral
Gneiss
Gneiss
metamorphic
Gneis
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic