Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Metamorphic or Igneous (context dependent)
Category
Metamorphic Or Igneous (Context Dependent)
Browse metamorphic or igneous (context dependent) specimens identified by the Rock Identifier community.
Learn about Metamorphic Or Igneous (Context Dependent) in the encyclopedia
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Black Star Diopside
Diopside (CaMgSi2O6) with Magnetite inclusions
mineral
Unidentified gray stone
Likely quartz-rich stone; exact identification is not possible from the image
mineral
Milky Quartz
SiO2 (Silicon Dioxide)
mineral
Pyrite in Matrix (likely Quartz or Schist matrix)
Iron Sulfide (FeS2)
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Tiny amber-colored crystal fragment
Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral
mineral
Sapphire
Corundum (Al2O3)
mineral
Fuchsite or Green Mica Schist
K(Al,Cr)2(AlSi3O10)(OH)2
metamorphic
Scoria
Scoria
Igneous
Unidentified Rock Fragment
Unknown
Rock
Black Tourmaline (Schorl)
Schorl (Complex sodium iron aluminum borosilicate)
mineral
Greenstone / Greenschist
Greenschist (containing Chlorite, Epidote, Actinolite)
metamorphic
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Wishing Stone
Greenschist or Basalt with Quartz/Calcite Vein
metamorphic
Raw Garnet (Hessonite / Spessartine)
Silicate mineral group (X3Y2(SiO4)3)
gemstone
Citrine
Citrine (Silicon Dioxide, SiO2)
mineral
Quartz
Quartz (SiO2)
Mineral
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Quartz (Bull Quartz)
Silicon Dioxide (SiO2)
mineral
Greenstone
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Bronzite
Enstatite (magnesium iron silicate), (Mg,Fe2+)SiO3
mineral
Assorted Beach Rocks and Pebbles
Various (Granite, Basalt, Quartz, Conglomerate, etc.)
igneous, sedimentary, metamorphic
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Quartzite Arrowhead
Quartzite (SiO2 silicon dioxide)
metamorphic
Blue Aventurine
Quartz (SiO2) with inclusions
mineral
Greenschist
Chlorite Schist (Greenschist Facies)
metamorphic
Aventurine (Green Aventurine)
Silicon Dioxide with Fuchsite inclusions (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite and Sunstone
Iron Sulfide (FeS2) and Plagioclase Feldspar ((Ca,Na)Al(Al,Si)Si2O8)
mineral
Dark weathered igneous rock, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides
igneous
Granite
Granite
Igneous
Granodiorite (Gneissic Pebble)
Granodiorite displaying minor foliation
igneous/metamorphic
Greenstone
Greenschist (composed of chlorite, actinolite, and epidote)
metamorphic
Ruby (in costume jewelry context)
Corundum (Al2O3) with Chromium impurities
mineral
Likely serpentine pebble
Serpentinite; predominantly serpentine-group minerals, Mg₃Si₂O₅(OH)₄
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral