Drill Core Samples (Varied Lithology)
Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)
igneous, sedimentary, and metamorphic
Category
This Is Not A Rock Or Mineral
Browse this is not a rock or mineral specimens identified by the Rock Identifier community.
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Tiger's Eye (Brown/Dark variety)
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Vesicular Basalt (or Scoria)
Vesicular Basalt (Aphanitic-vesicular volcanic rock)
igneous
Agate
Agate (Silicon Dioxide, SiO2)
mineral
Basalt with Scoria
Amygdaloidal Basalt / Vesicular Basalt
igneous
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Unidentified Rock Fragment
Unknown
Rock
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
sedimentary
Gold-bearing Quartz with Iron Oxides
Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)
mineral
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Fluorite with Quartz coating
Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)
mineral
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Amygdaloidal Basalt with Epidote/Chlorite
Basalt (containing (Ca2(Al2Fe3+)(SiO4)(Si2O7)O(OH)))
igneous
Agate
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Felsic Igneous Rock
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
igneous
Mexican Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
mineral
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (with secondary mineral infilling)
igneous
Basalt with Quartz/Calcite Vein
Amygdaloidal Basalt (matrix) with Mineral Vein filling
igneous
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Shatter Cone
Impactite (Shatter Cone texture)
metamorphic
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Amygdaloidal Basalt
Amygdaloidal Mafic Volcanic Rock
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Calcite (Yellow/Orange variety - sometimes called Honey Calcite)
Calcite
Mineral
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)