Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Category
Minerals
Browse minerals specimens identified by the Rock Identifier community.
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Quartz (Milky/Clear)
Silicon Dioxide (SiO2)
mineral
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Feldspar (Orthoclase)
Potassium Alveolar Silicate (KAlSi3O8)
mineral
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Malachite
Copper Carbonate Hydroxide (Cu2CO3(OH)2)
mineral
Limonite (Ochreous Sandstone)
Hydrous ferric oxides (FeO(OH)qnH2O)
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Sandstone / Chert Gravel
SiO2 (Silicon Dioxide based clastic sedimentary rock)
sedimentary
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Shale
Shale
sedimentary
Green Aventurine and Clear Quartz
Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)
Mineral
Limonite
FeO(OH)·nH2O
mineral
Planet Earth
Gaia (Silicate Terrestrial Planet)
metamorphic
Schist
Schist
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Azurite and Malachite
Copper Carbonates: Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Granite or Granitic Gneiss River Rock
Granite
igneous
Granite
Granite (High-silica plutonic rock)
igneous
Diamond
Native Carbon (C)
gemstone
Granite
Felsic intrusive igneous rock
igneous
Granite Boulder
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss with Orthoclase Feldspar
Gneissic Metamorphic Rock with K-Feldspar inclusions
metamorphic
Ruby (varieties of Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Greenstone / Greenschist
Chlorite schist / Epidiorite
metamorphic
Quartz on Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
igneous
Mixed polished gemstones and minerals
Likely agate/chalcedony (SiO₂), quartz, jasper, and possibly aventurine or obsidian; exact identification requires individual testing.
gemstone
Mixed mineral and shell specimen assortment
Primarily unidentified quartz-/feldspar-like pebbles with possible dark basalt or iron-rich fragments; white pieces may include shell or calcite
mineral
Vesicular basalt
Basalt, commonly composed of plagioclase feldspar, pyroxene, and often olivine
igneous
Unidentified dark rock fragment
Likely fine-grained mafic mineral aggregate; exact identification requires testing
mineral
Greenschist
Greenschist (containing Chlorite, Epidote, and Actinolite)
metamorphic
Quartz with inclusions (likely Chlorite or Hornblende) and country rock
SiO2 (Quartz) with associated ferromagnesian minerals
Mineral/Igneous/Metamorphic association
Gneiss
Gneiss
metamorphic
Quartz Druzy on Matrix (with Copper Mineralization)
Silicon Dioxide (SiO2) with Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O)
mineral
Tumbled basalt pebble
Basalt (fine-grained mafic volcanic rock; commonly plagioclase, pyroxene, and iron-titanium oxides)
igneous
Limonite Sandstone
Ferruginous Sandstone (Hydrated Iron Oxide)
sedimentary