Chalcedony (Yellow Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Category
Basalt
Browse basalt specimens identified by the Rock Identifier community.
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Green Apophyllite
Fluorapophyllite-(K), KCa4(Si8O20)(F,OH)·8H2O
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Chalcedony (specifically Blue Chalcedony or Common Opal variety)
Silicon Dioxide (SiO₂)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Greenschist (Greenstone)
Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)
metamorphic
Vesicular Basalt (Scoria)
Mafic extrusive igneous rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Pumice
Pumice (Highly vesicular felsic extrusive igneous rock; primarily SiO2)
igneous
Scoria (Lava Rock)
Scoria (vesicular basaltic rock)
igneous
Greenstone (Greenschist)
Greenschist (composed of Chlorite, Epidote, and Actinolite)
metamorphic
Rhyolite
Rhyolite
igneous
Vesicular Basalt (Scoria)
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Diabase (also known as Dolerite)
Diabase
igneous
Alkali Basalt with iron oxidation
Mafic Volcanic Rock (Fe-bearing Basalt)
igneous
Black Onyx
Silicon Dioxide (SiO2) with cryptocrystalline structure
mineral
Scoria (Lava Rock)
Scoria (Mafic Volcanic Rock)
igneous
Blue Chalcedony
Microcrystalline Quartz (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Peridot
Olivine ((Mg,Fe)2SiO4)
Mineral
Red Jasper (Silicate Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Basalt with Pahoehoe flow texture
Vesicular Basalt (Aphanitic Mafic Igneous Rock)
igneous
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Amethyst (Tumbled)
Amethyst (Silicon Dioxide with Iron impurities) - SiO2
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Basalt with Caliche Crust
Aphanitic Mafic Igneous Rock with Calcium Carbonate (CaCO3) coating
igneous
Quartz-veined Basalt
Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein
igneous
River Rock (Basalt/Greywacke)
Aphanitic Basalt or Lithic Sandstone (Greywacke)
igneous
Jasper and Basalt Mix (Dark Chert/Basalt River Pebble)
Silicon Dioxide (SiO2) or Mafic extrusive igneous rock
sedimentary or igneous
Basalt with Quartz/Calcite Vein
Amygdaloidal Basalt (matrix) with Mineral Vein filling
igneous
Scoria (Lava Rock)
Scoria (Vesicular Basaltic Rock)
Igneous
Conglomerate
Sedimentary Conglomerate with Basaltic Clast
sedimentary
Scoria
Scoria (Vesicular Basaltic Glass)
Igneous
Scoria (Red Lava Rock)
Scoria (Vesicular basaltic rock)
Igneous
Scoria (Volcanic Rock)
Scoria (often basaltic scoria)
Igneous
Scoria
Vesicular Basaltic Andesite/Scoria
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Epidote in Matrix
Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Amethyst
Amethyst (SiO2 with iron impurities)
mineral