Boxwork Quartz / Septarian Jasper
Boxwork (SiO2 with iron oxide inclusions)
metamorphic
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Granite
Plutonic felsic igneous rock
igneous
Granite
Granite
Igneous
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Gneiss
Gneiss (a metamorphic rock)
Metamorphic
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone (Greywacke)
Arenite / Wacke (Mainly SiO2 with various lithic fragments)
sedimentary
Basalt
Mafic Igneous Rock
igneous
Basalt
Mafic Igneous Rock
igneous
Crinoid Fossil in Limestone
Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)
sedimentary
Basalt with Quartz Vein
Mafic Igneous Rock (SiO2 filling)
igneous
Basalt
Basalt
igneous
Basalt
Mafic volcanic rock (Primarily Plagioclase Feldspar and Pyroxene)
Igneous
Basalt
Extrusive mafic igneous rock
igneous
Granular Sandstone
Arenite (variable composition, primarily SiO2)
sedimentary
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Basalt
Extrusive Mafic Igneous Rock
igneous
Basalt River Cobble
Basalt (Composition primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt (River Cobble)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Quartz Crystal (specifically a Double-Terminated variety)
Silicon Dioxide (SiO2) - Low Quartz
mineral
Quartz in Host Rock
Silicon Dioxide (SiO2) in Rhyolite or Granite matrix
igneous
Basalt
Basalt
igneous
Thunderegg (Ate Agate/Jasper Geode)
Silicon Dioxide (SiO2) within Rhyolite/Perlite matrix
sedimentary/igneous intermediary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with FeO/Fe2O3)
sedimentary
Basalt
Mafic Igneous Rock
igneous
Gold in Quartz Matrix
Native Gold (Au) with Quartz (SiO2) and Slate/Shale
mineral
Biotite Schist
Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Sandstone (likely a river or beach pebble)
Sandstone (a clastic sedimentary rock)
Sedimentary Rock
Basalt
Mafic Igneous Rock
igneous
Basalt (River Stone)
Mafic volcanic rock
igneous