Quartzite
Quartzite (primarily SiO2)
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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Yellow Diamond (Faceted)
Diamond (C - Pure Carbon)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Emerald / Green Beryl
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Epidotite (Unakite-related Epidote)
Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)
Mica Schist with Quartz
Muscovite/Biotite Schist
metamorphic
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Epidote in Quartz (Epidosite)
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Rhodonite
Rhodonite (MnSiO3)
mineral
Diamond
Carbon (C)
mineral
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Garnet (Almandine variety)
Almandine, Fe3Al2(SiO4)3
Mineral
Heat-Treated Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Light Green Quartzite
Metamorphosed Quartz Sandstone (SiO2 with chlorite or mica inclusions)
metamorphic
Epidosite (Unakite-related)
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Greenstone / Diabase Porphyry
Porphyritic Diabase (Micro-gabbro)
Igneous
Fuchsite
Cr-bearing Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Red Quartzite
Quartzite (SiO2)
metamorphic
Nephrite Jade
Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2
Mineral
Limonite with Galena
FeO(OH)·nH2O (Limonite) and PbS (Galena)
mineral
Feldspar (Orthoclase)
Potassium Alveolar Silicate (KAlSi3O8)
mineral
Diamond
Carbon (C)
gemstone
Diamond
C (Carbon)
mineral
Diamond
Carbon (C)
mineral
Sandstone or Limestone
Sedimentary Rock
Sedimentary
Biotite Schist (likely)
Biotite Schist (rock), Biotite (mineral)
Metamorphic
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Quartzite
Quartzite (SiO2)
Metamorphic
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Sand (Construction Grade)
Unconsolidated siliciclastic sediment (primarily SiO2)
sedimentary
Beryl (likely var. Aquamarine or Goshenite) in Matrix
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Metamorphic Rock
Fairy Stone (Staurolite)
Staurolite (Fe2+2Al9Si4O22(OH)2)
mineral
Diamond (Faceted Colorless)
Diamond (Pure Carbon, C)
mineral
Turquoise (Dyed Howlite/Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (Target mineral) / MgCO3 (Magnesite substrate)
mineral
Conglomerate (Puddingstone)
Conglomerate (specifically, clastic sedimentary rock)
Sedimentary