Sunstone (Heliolite)
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Category
Basalt
Browse basalt specimens identified by the Rock Identifier community.
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Greenstone with Epidote or Quartz Vein
Epidiorite or Metabasalt (composed largely of Chlorite, Epidote, and Amphibole)
metamorphic
Ruby
Corundum (Al2O3) with Chromium traces
mineral
Agate (specifically Botswana or Banded Agate variety)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Ruby (Raw Corundum)
Corundum (Al2O3:Cr)
mineral
Labradorite
Labradorite ((Ca,Na)(Al,Si)4O8)
mineral
Greenschist
Greenschist (chlorite-epidote schist)
metamorphic
Sunstone
Heliolite (Oligoclase or Orthoclase Feldspar), (Ca,Na)(Al,Si)4O8
mineral
Greenshist / Chlorite Schist
Chlorite schist (contains (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
metamorphic
Labradorite
Labradorite, (Ca, Na)(Al, Si)4O8
mineral
Ruby
Corundum (Al2O3 with Chromium trace elements)
mineral
Ruby
Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)
mineral
Ruby
Corundum (Al2O3 with Chromium)
mineral
Agate
Agate (Silicon Dioxide - SiO2)
mineral
Chalcedony (Yellow Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
mineral
Druzy Quartz on Chalcedony Matrix
Silicon Dioxide (SiO2)
mineral
River Cobble (likely Basalt or Greenstone)
Mafic Igneous Rock (with possible chloritic alteration)
igneous
Peridotite
Ultramafic intrusive rock (Peridotite)
Igneous
Chlorastrolite (Isle Royale Greenstone)
Chlorastrolite (Pumpellyite-(Mg,Al)), formula: Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2∙H2O
mineral
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt (primarily SiO2, MgO, FeO, and CaO)
Igneous
Vesicular Basalt (or Scoria)
Mafic extrusive igneous rock with vesicles
igneous
Basalt with Quartz/Feldspar Vein
Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)
igneous
Carnelian
Carnelian (Microcrystalline Quartz, SiO2 with Fe2O3 impurities)
mineral
Olivine (Peridotite)
Magnesium Iron Silicate - (Mg, Fe)2SiO4
igneous
Flower Agate
Chalcedony with Opaque Spherulitic Inclusions (SiO2)
Mineral
Peridotite (Olivine)
Peridotite (comprising (Mg,Fe)2SiO4)
igneous
Carnelian Agate
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Basalt with Quartz Veins
Amygdaloidal Basalt (matrix) with Crystalline SiO2 (veins)
igneous
Epidote and Quartz in Basalt Porpohyry
Epidote bearing Porphyritic Basalt with Quartz Veins
igneous
Stilbite
Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)
mineral
Greenstone with Magnetite Veins
Metabasalt (Greenstone)
metamorphic
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety
Mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Greenschist (containing Epidote and Quartz)
Greenschist (Epidote-Chlorite-Actinolite Schist)
metamorphic
Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Green Schist
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
metamorphic
Gabbro
Phaneritic Mafic Igneous Rock
igneous
Labradorite
Labradorite (Plagioclase Feldspar Series: (Ca,Na)(Al,Si)4O8)
mineral
Ruby (Raw/Rough)
Corundum (Al2O3 with Chromium trace)
mineral