Lapis Lazuli
Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)
Mineral, part of a rock
Category
Igneous Or Metamorphic
Browse igneous or metamorphic specimens identified by the Rock Identifier community.
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Metamorphic or Igneous (context dependent)
Amethyst
SiO2 (Silicon Dioxide)
Mineral
Kyanite
Kyanite (Al2SiO5)
Mineral
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
Mineral
Yellow Aventurine (Yellow Quartz)
Silicon Dioxide (SiO2) with inclusions of Muscovite or Mica
Mineral (variant of Quartz)
Green Quartz (Aventurine)
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Pyrite (or Fool's Gold)
Pyrite (FeS₂)
Mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
mineral
Quartz (likely milky/gray variety)
Quartz (SiO₂)
Mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar
mineral
Moonstone
Adularia (orthoclase) or Albite (plagioclase), a feldspar mineral (KAlSi3O8 or NaAlSi3O8 respectively, often a mixture)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Gold
Gold (Au)
Mineral
Greenstone (possibly Basalt or Greenschist)
Greenschist (composed primarily of chlorite, actinolite, and epidote)
Metamorphic (low-grade)
Rhodonite in Matrix
Rhodonite (Manganese Silicate) - (Mn2+,Fe2+,Mg,Ca)SiO3
mineral
Quartz with Mica (Micaceous Quartz)
Silicon Dioxide (SiO2) with Phyllosilicates
igneous/metamorphic
Peridot and Citrine Gemstones (in a ring setting)
Peridot (Olivine: (Mg,Fe)2SiO4), Citrine (Quartz: SiO2)
mineral
Sapphirine in Magnesian Schist
Sapphirine: (Mg,Al)8(Al,Si)6O20
metamorphic
Quartz
Silicon Dioxide (SiO2)
Mineral
Granitoid (Granite/Gneiss)
Granitoid silicate rock, primarily quartz and feldspar
igneous/metamorphic
Riverstone (Quartzite/Granite Cobble)
Silicon Dioxide (SiO2) based Quartzite or Silicate-rich Granite
metamorphic or igneous
Granodiorite (Gneissic Pebble)
Granodiorite displaying minor foliation
igneous/metamorphic
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Matrix
igneous/metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with fuchsite inclusions)
Mineral
Fluorite and Rose Quartz
Fluorite (CaF2), Rose Quartz (SiO2)
Mineral
Rhodonite
Manganese Inosilicate (MnSiO3), often with Ca, Fe, Mg, Zn
Mineral
Garnet (likely Pyrope or Almandine)
Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.
Mineral
Quartz (possibly milky quartz or quartz with inclusions)
SiO2 (Silicon Dioxide)
Mineral
Green Aventurine
Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral, often found as detrital grains in sedimentary rocks
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
Quartz
Silicon Dioxide (SiO₂)
Mineral
Rhodonite
Manganese Inosilicate (MnSiO3)
Mineral
Quartz Geode/Cluster
Quartz (SiO2)
mineral
Calcite
Calcite (CaCO₃)
Mineral
Quartz with Mica/Chlorite inclusions
Silicon Dioxide (SiO2) with phyllosilicate inclusions
igneous/metamorphic mineral specimen
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral