Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Category
Basalt
Browse basalt specimens identified by the Rock Identifier community.
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Vesicular Basalt (Scoria)
Aphanitic Mafic Igneous Rock (Vesicular Basalt)
igneous
Porphyritic Amygdaloidal Basalt
Amygdaloidal Porphyritic Basalt (Mafic volcanic rock)
igneous
Eucrite Meteorite
Achondrite (Eucrite)
meteorite
Scoria
Extrusive Mafic Volcanic Rock
igneous
Dyed Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Larimar
Pectolite (NaCa2Si3O8(OH))
mineral
Sunstone
(Ca,Na)((Al,Si)2Si2O8) - Plagioclase Feldspar
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
mineral
Blue Lace Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Greenstone (Rough Jadeite or Nephrite)
Sodium aluminum silicate (Jadeite) / Calcium magnesium iron silicate (Nephrite)
metamorphic
Basalt with Quartz/Feldspar Inclusions
Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining
igneous
Scoria
Scoria (Extrusive Volcanic Rock)
igneous
Lake Superior Agate
Silicon Dioxide (SiO2) with impurities
mineral
Eclogite
Eclogite (Omphacite + Pyrope-Almandine Garnet)
metamorphic
Milky Quartz with Garnet/Hematite and Basalt
Silicon Dioxide (SiO2) with Almandine (Fe3Al2Si3O12) and Basalt
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Olivine-rich Basalt with Peridotite Xenoliths
Porphyritic Basalt containing Dunite/Peridotite (Mg,Fe)2SiO4
igneous
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Diorite
Diorite
igneous
Banded Agate (Gray/White)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca, Na)(Al, Si)4O8
mineral
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Sunstone
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Peridot (Gem-quality Olivine)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Larimar
Pectolite (NaCa2Si3O8(OH))
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Wishing Stone (Basalt or Chert with Quartz Veins)
Basalt or microcrystalline Quartz (Chert) with localized hydrothermal Quartz (SiO2) veining
igneous or sedimentary
Epidote
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8
mineral
Greenschist (Chlorite Schist)
Greenschist (containing chlorite, actinolite, and epidote)
metamorphic
Greenstone
Metabasalt / Greenschist facies rock
metamorphic
Oceanside Agate (Orbicular Agate)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Rough Amethyst Quartz
Silicon Dioxide with Iron impurities (SiO2)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)
mineral
Metagabbro / Epidote Gneiss
Epidote bearing Hornblende Gneiss
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Labradorite
Labradorite (Ca, Na)(Al, Si)4O8
igneous