Siltstone Pebble
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Category
Industrial Byproduct (Anthropogenic Material)
Browse industrial byproduct (anthropogenic material) specimens identified by the Rock Identifier community.
Learn about Industrial Byproduct (Anthropogenic Material) in the encyclopedia
View all →
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Jasper (Green Jasper/River Stone)
Silicon Dioxide (SiO2) with impurities
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - variety Jasper
sedimentary
Sandstone
Arenite (mainly SiO2 with varying cements)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (with Chert/Quartzite)
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Ammonite Fossil
Ammonoidea (primarily composed of Calcite, CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Glacial Erratic (Sandstone/Quartzite)
Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)
sedimentary or metamorphic
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone with Manganese Dendrites
Arenite (mostly SiO2) with Manganese Oxide inclusions (MnO2)
sedimentary
Siltstone Pebble
Siltstone
sedimentary
Marble (polished)
Recrystallized Calcite (CaCO3)
metamorphic
Olivine in Basalt
Peridotite / Forsterite ((Mg,Fe)2SiO4)
igneous
Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Amazonite
Microcline (KAlSi3O8) with trace lead (Pb)
mineral
Sunstone
(Ca,Na)(Al,Si)4O8 (Oligoclase or Andesine)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Asphalt / Bituminous Aggregate
Bituminous mixture (Hydrocarbon-based sediment)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Ironstone (Limonitic Sandstone)
Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)
sedimentary
Polished quartz-rich pebble, possibly jasper or quartzite
Quartzite or chalcedony-bearing jasper; predominantly SiO₂
metamorphic
Polished pink banded agate
Microcrystalline quartz (chalcedony), SiO₂
mineral
Polished agate (likely fire agate or carnelian-bearing agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide inclusions
gemstone
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides.
mineral
Granite Pegmatite
Pegmatite (Quartz, Feldspar, Mica)
igneous
Diamond
Carbon (C)
gemstone
Agate
Silicon Dioxide (SiO2)
mineral
Feldspar (Granite Pegmatite matrix)
Potassium Feldspar (KAlSi3O8) / Quartz Mixture
igneous
Limestone
Calcium Carbonate (CaCO3 - Calcite)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 dominated clastic sedimentary rock)
sedimentary
Milky Quartz with Chlorite / Mica inclusions
Silicon Dioxide (SiO2) with phyllosilicate inclusions
igneous
Tumbled brown stone, likely smoky quartz or brown jasper
Probable smoky quartz (SiO₂) or iron-rich jasper (microcrystalline SiO₂); image alone is insufficient for certainty
mineral
Pegmatite (Quartz and Feldspar with Dark Minerals)
Igneous Pegmatite
igneous