Kimberlite
Kimberlite
igneous
Category
Igneous Rock
Browse igneous rock specimens identified by the Rock Identifier community.
Peridotite (with Olivine)
Peridotite (rich in Olivine, (Mg,Fe)2SiO4)
igneous
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Druzy Quartz on Vesicular Basalt
Silicon Dioxide (SiO2) in an extrusive Mafic igneous host rock
igneous
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Granite Pebble
Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Mica)
igneous
Greenstone
Greenschist (composed of actinolite, chlorite, and epidote)
metamorphic
Basalt with Epidote (Porphyry)
Basalt (with inclusions of Epidote/Feldspar)
igneous
Quartz (Druzy/Macro-crystalline)
Silicon Dioxide (SiO2)
mineral
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Carnelian Agate (with Quartz/Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Scoria (Lava Rock)
Vesicular Basalt / Scoria
Igneous
Scoria (Lava Rock)
Mafic extrusive volcanic rock (Scientific formula varies based on mineral content: primarily SiO2, MgO, and FeO)
igneous
Obsidian
Amorphous Volcanic Glass (primarily SiO2)
igneous
Basalt
Basalt (containing Pyroxene, Plagioclase Feldspar, and Olivine)
igneous
Basalt
Basalt
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
River Quartz (Milky and Smoky mix)
Silicon Dioxide (SiO2)
mineral
Red Scoria (Lava Rock)
Scoria (Vesicular Basalt/Andesite)
igneous
Quartz / Rock Crystal
Silicon Dioxide (SiO2)
mineral
Rough Star Sapphire (Corundum)
Al2O3 (Aluminum Oxide)
mineral
Granite
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Granodiorite
Granodiorite (Intermediate to Felsic Intrusive Rock)
igneous
Black Sand (Magnetite Sand)
Magnetite-rich Placers (Fe3O4)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Diabase
Diabase (also known as Dolerite)
igneous
Basalt with Quartz/Feldspar Inclusions
Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)
igneous
Amygdaloidal Basalt with Agate/Chalcedony Infills
Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Infilling (e.g., Agate, Quartz, or Zeolite)
igneous
Vesicular Basalt
Basalt
igneous
Basalt
Basalt (dominated by Plagioclase Feldspar and Pyroxene)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Basalt
Basalt
igneous
Basalt
Basalt (composition of Plagioclase feldspar and Pyroxene)
igneous
Basalt
Basalt
igneous
Basalt
Basalt (composition predominately plagioclase feldspar and pyroxene)
igneous
Decomposed Granite
Grano-diorite/Granite-residuum (SiO2 primary)
igneous