Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
Mineral
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
Learn about Metamorphic Or Sedimentary Depending On Local Grade in the encyclopedia
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Shiva Lingam
Cryptocrystalline Quartz (Jasproid/Sandstone) with Iron Oxide (Fe2O3)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Gneiss
Gneiss
metamorphic
Gneissic River Pebble
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Schist (specifically Chlorite/Greenschist)
Chlorite Schist
metamorphic
Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Breccia
Clastic Breccia
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Banded Iron Formation (Red Jasper and Hematite Chert)
Banded Iron Formation (BIF); Fe2O3 (Hematite) + SiO2 (Quartz/Jasper)
sedimentary
Muscovite Schist
Muscovite Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Greenstone / Metagraywacke
Metamorphosed basaltic or sedimentary rock (Complex Silicate)
metamorphic
Gneiss with Orthoclase Feldspar
Gneissic Metamorphic Rock with K-Feldspar inclusions
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss with Quartz Veining
Gneiss (High-grade regional metamorphic rock)
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
River Quartzite Siltstone
Quartz-rich Meta-siltstone (SiO2 dominated)
metamorphic
Mixed Quartz Bracelet (Rose Quartz and Larimar-colored beads)
Silicon Dioxide (SiO2) with various inclusions
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Granite Gneiss
Gneiss (derived from granitic protolith)
metamorphic
Emerald (Faceted Gemstone)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
Mineral
Gneiss (Metamorphic Cobble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Puddingstone
Conglomerate
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone and Quartzite Specimens
SiO2 with varying mineral/clastic inclusions
sedimentary/metamorphic
Greenstone / Greenschist
Greenschist (containing Chlorite, Epidote, Actinolite)
metamorphic
Greenschist
Greenschist (containing Chlorite, Epidote, and Actinolite)
metamorphic
Eclogite
Eclogite (Omphacite-Garnet Rock)
metamorphic
Greenschist
Chlorite schist
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Specular Hematite
Hematite (Fe2O3)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic