Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
igneous
Category
Igneous Rock
Browse igneous rock specimens identified by the Rock Identifier community.
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Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Granodiorite
Granodiorite (Phaneritic intrusive igneous rock containing Plagioclase, Quartz, and Biotite/Amphibole)
igneous
Porphyritic Rhyolite or Andesite (Porphyry)
Porphyritic igneous rock (Composition depends on exact mineralogy, often Rhyolite or Andesite)
igneous
Granite
Phaneritic intrusive igneous rock (consisting mainly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Obsidian
Obsidian (volcanic glass), amorphous SiO2 + impurities
igneous
Que Sera Stone (Llanite)
Rhyolite Porphyry with Blue Quartz and Feldspar
igneous
Granite
Phaneritic intrusive igneous rock (composition: Quartz, Alkali Feldspar, Plagioclase Feldspar)
igneous
Pumice
Pumiceous volcanic glass
igneous
Milk Quartz (White) and Yellow Aventurine (Yellow)
Silicon Dioxide (SiO2)
mineral
Tree Agate (Dendritic Agate/Quartz)
Silicon Dioxide (SiO2) with trace Manganese or Iron oxide inclusions
mineral
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Granite
Phaneritic plutonic rock composed of Quartz, Feldspar, and Mica
igneous
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Crystalline Quartz (SiO2) with iron impurities
mineral
Granite Pebble
Granite (a phaneritic intrusive igneous rock consisting of quartz, alkali feldspar, and plagioclase)
igneous
Granite
Granite (a felsic intrusive igneous rock composed primarily of quartz, feldspar, and mica)
igneous
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Llanite (Rhyolite with Blue Quartz)
Porphyritic Rhyolite
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Granite Gneiss
Gneiss (quartz-feldspar dominated)
metamorphic
Granodiorite
Granodiorite (intermediate intrusive igneous rock containing plagioclase, quartz, and K-feldspar)
igneous
Red Granite
Phaneritic Felsic Intrusive Igneous Rock (primarily K-feldspar, Quartz, and Biotite)
igneous
Granite
Phaneritic Intrusive Igneous Rock (primarily composed of SiO2, Al2O3, K2O, Na2O)
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)
igneous
Pink Granite
Granite (Phaneritic igneous rock composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock consisting of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Pink Granite
Felsic Intrusive Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)
igneous
Granite
Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O
igneous
Granite
Phaneritic Igneous Rock (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Quartz
Silicon Dioxide with trace inclusions of dumortierite or titanium (SiO2)
mineral
Basalt
Basalt
igneous
Dalmatian Jasper (Dalmatian Stone)
Peralkaline rhyolite
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Peridotite
Peridotite (composed largely of Olivine (Mg,Fe)2SiO4 and Pyroxene)
igneous