Pegmatite
Granitic Pegmatite
igneous
Category
Minerals
Browse minerals specimens identified by the Rock Identifier community.
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Kimberlite
Kimberlite (Potassic ultramafic volcanic rock)
igneous
Septarian Nodule
Septarian Nodule (Mixture of Calcite, Aragonite, and Limestone/Clay)
sedimentary
Greenstone
Greenschist
metamorphic
Mica Schist
Muscovite/Biotite Schist
metamorphic
Sandstone (with Iron Staining)
Arenite
sedimentary
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Granite
Granite (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist (Group of medium-grade metamorphic rocks)
metamorphic
Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)
Metamorphic Rock
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
sedimentary
Limonite
Limonite (Hydrated iron(III) oxide-hydroxide) FeO(OH)·nH2O
mineral
Ferruginous Quartzite (also known as Ironstone or Gossan)
Ferruginous Quartzite with Goethite/Hematite staining
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Garnet Gneiss
Gneiss containing almandine-pyrope garnet
metamorphic
Quartz (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Oyster Shell (Aragonite/Calcite)
Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Sunstone (Feldspar)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8 with inclusions of Hematite/Goethite
mineral
Orange Quartz (or Tumbled Carnelian)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Kunzite (variety of Spodumene)
Lithium Aluminum Silicate (LiAlSi2O6)
mineral
Amygdaloidal Basalt with Quartz Infill
Basalt (SiO2 for the quartz inclusion)
igneous
Jasper in Basalt Matrix
Silicon Dioxide (SiO2) with impurities; Chalcedony
sedimentary (secondary mineral) within igneous
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2)
igneous
Calcite with Quartz coating
Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2)
mineral
Amethyst (Purple), Sulfur (Yellow), and Blue Apatite
SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)
mineral
Limonite Concretion
Limonite (FeO(OH)·nH2O)
sedimentary
Snowflake Obsidian
Obsidian with Cristobalite inclusions
igneous
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Bauxite
Bauxite (Mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Limonite (Ironstone)
Limonite (FeO(OH)·nH2O)
mineral
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)
metamorphic
Goethite/Limonite Iron Ore Node
Goethite (FeO(OH)) or Limonite (mixture of hydrated iron oxides)
mineral