Plagioclase Feldspar
Plagioclase (NaAlSi3O8 - CaAl2Si2O8 series)
mineral
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
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Basalt
Afanitic Mafic Basalt
igneous
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Granite
Granite (Felsic Plutonic Rock)
Igneous
Boxwork Quartz / Septarian Jasper
Boxwork (SiO2 with iron oxide inclusions)
metamorphic
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2 (Tremolite-Actinolite series)
metamorphic
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Porphyritic Granite (Glacial Erratic)
Porphyritic Biotite Granite
igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Moss Agate and Hematite
Silica (SiO2) with fibrous inclusions of Manganese or Iron; Hematite (Fe2O3)
mineral
Emerald
Beryl (Be₃Al₂(SiO₃)₆) with Chromium or Vanadium impurities
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Corundum (Sapphire variant)
Aluminum Oxide (Al2O3)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, along with Calcite and Pyrite)
metamorphic
Corundum (Ruby variety)
Aluminium oxide (Al2O3)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Cobble
Quartz (Silicon Dioxide, SiO2)
Mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Crystalline Quartz (Rough)
Quartz (Silicon Dioxide, SiO2)
mineral
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Arsenopyrite
Arsenopyrite (FeAsS)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Diamond
Carbon (C)
mineral
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Limonite (Ironstone)
FeO(OH)·nH2O (Hydrous ferric oxides)
mineral
Basalt with Limonite stains
Extrusive mafic igneous rock; Limonite (FeO(OH)·nH2O)
igneous