Diamond Drill Core (Greenschist and Quartzite)
Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)
metamorphic
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Learn about Amorphous Solid in the encyclopedia
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Quartzite Pebble (River Rock)
Quartzite (mainly SiO2)
metamorphic
Gold Ore in Quartz/Matrix
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Bismuth Crystal
Bismuth (element symbol Bi, atomic number 83)
mineral
Meteorite (Chondrite)
Chondritic Meteorite (Undifferentiated extraterrestrial rock)
igneous
Vesicular Basalt (Scoria)
Basalt with vesicular texture
igneous
Scoria (Lava Rock)
Scoria (vesicular mafic igneous rock)
igneous
Vesicular Basalt / Scoria
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Porphyry (specifically Porphyritic Basalt or Andesite)
Porphyritic extrusive igneous rock (Mg,Fe)2SiO4 (Olivine inclusions/Plagioclase Feldspar)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Dendritic Agate
Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)
mineral
Banded Agate Geode
Silicon Dioxide (SiO2)
mineral
Andesite Porphyry
Andesite (extrusive volcanic rock)
igneous
Basalt
Basalt (extrusive volcanic rock)
igneous
Quartz Geode (Druzy)
Crystalline Silicon Dioxide (SiO2)
mineral
Basalt with Granite Inclusions (Xenolith)
Mafic Igneous Rock (Basalt) with Felsic Igneous Inclusion (Granite)
igneous
Basalt with Quartz/Calcite Veins
Basalt with hydrothermal vein infill
igneous
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Fossiliferous Sandstone (with Quartz patch)
Sedimentary Sandstone with Silicified Shell Fragments
sedimentary
Siltstone / Shale River Rock
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Sandstone (Quartzite texture)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Anthracite coal
Anthracite; predominantly carbon (C), with minor macerals, ash, sulfur, and trace minerals
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebbles
Quartzite (SiO2 silicon dioxide dominant)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Jasper (Milky/Cream Variety)
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary (chemical/biological)
Quartzite
Quartzite (SiO2)
metamorphic
Weathered, vesicular volcanic rock (likely scoria or altered basalt)
Vesicular basalt/scoria; predominantly plagioclase, pyroxene, olivine, and secondary iron oxides
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Blue Lace Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
River Stone (likely Siltstone or fine-grained Basalt)
Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)
sedimentary or igneous
Porphyritic Basalt
Porphyritic Basalt (containing Plagioclase phenocrysts)
igneous
Ferruginous Quartz
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3/FeO(OH))
mineral
Red Jasper
Silicon Dioxide (SiO2) - Chalcedony
mineral
Malachite and Azurite on Gossan (Ironstone Matrix)
Cu2CO3(OH)2 (Malachite) on FeO(OH)·nH2O (Limonite/Gossan)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Red vesicular volcanic rock, likely scoria
Scoria (vesicular basalt/andesite), composition mainly plagioclase, pyroxene, iron oxides, and volcanic glass
igneous
Scoria (Vesicular Basalt)
Scoria (Vesicular Igneous Rock)
igneous
Scoria (Lava Rock)
Scoria (Mafic Volcanic Rock)
igneous
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral