Vesicular Basalt (or Scoraceous Basalt)
Basalt (Vesicular texture)
igneous
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Learn about Mineral Based Composite in the encyclopedia
View all →
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Basalt with Quartz/Calcite Veins
Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)
igneous
Granite
Granite (composed primarily of Quartz SiO2, Orthoclase KAlSi3O8, and Plagioclase NaAlSi3O8 to CaAl2Si2O8)
Igneous
Muscovite Mica
Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2
Mineral
Basalt
Mafic Igneous Rock (composed primarily of pyroxene and calcium-rich plagioclase)
igneous
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
igneous
Basalt
Basalt
igneous
Basalt
Basalt
igneous
Basalt (River Cobble)
Mafic Igneous Basalt (composed primarily of Plagioclase feldspar, Pyroxene, and Olivine)
Igneous
Pink Granite
Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)
igneous
Basalt with Quartz Veining
Veined Basalt (composed primarily of plagioclase feldspar, pyroxene, and olivine with quartz/calcite infill)
igneous
Conglomerate
Conglomerate
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock, primarily SiO2)
sedimentary
Rounded basalt pebble
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine
igneous
Biotite Schist
Biotite Schist
metamorphic
Basalt with Olivine
Aphanitic Basalt with (Mg,Fe)2SiO4 phenocrysts
igneous
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Dendritic Agate
Silicon Dioxide with Manganese or Iron Oxide inclusions (SiO2 + Mn/Fe)
mineral
Sagenitic Agate (with Goethite/Rutile inclusions)
Silicon Dioxide (SiO2) with hydrous ferric oxide inclusions
mineral
Granite
Felsic Intrusive Igneous Rock
igneous
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Citrine
Silicon Dioxide (SiO2) - Macrocrystalline Quartz variety
mineral
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Pink Granite (Water-worn pebble)
Phaneritic Felsic Igneous Rock
igneous
Diorite
Intermediate plutonic igneous rock
Igneous
Diorite
Intermediate Phaneritic Igneous Rock (Diorite)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite (specifically Rapakivi Granite)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Chert (specifically Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) with Chlorite inclusions
Mineral variant
Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Chrysocolla on Quartz/Rhyolite matrix
Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Dendritic Agate (Montana Moss Agate)
Silicon Dioxide (SiO2) - Chalcedony with Manganese/Iron inclusions
mineral
River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)
Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)
Sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Basalt with Weathered Rind
Basalt (Extrusive Mafic Igneous Rock)
igneous
Chert (specifically Tan Chert)
Chert (SiO2)
sedimentary
Tree Agate
Silicon Dioxide (SiO2) with Chlorite/Manganese inclusions
sedimentary
Vesicular Basalt
Basalt with secondary mineral infilling (Amygdaloidal Basalt)
igneous
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Snowflake Obsidian
Obsidian with Cristobalite inclusions (mostly amorphous SiO2)
igneous