Painted Garden Rock (likely Granite or Limestone base)
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments
igneous or sedimentary (anthropogenic modification)
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
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Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Rounded weathered granite (granitoid cobble)
Granite, composed mainly of quartz, feldspar, and mica/amphibole
igneous
Tumbled quartz-rich agate/geode fragment
Microcrystalline quartz (SiO₂), likely chalcedony with crystalline quartz and possible iron-oxide inclusions
mineral
Pink granite (weathered, rounded cobble)
Granite; predominantly quartz, potassium feldspar, plagioclase, and mica/amphibole
igneous
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
André Landed Here Rock (Glacial Erratic)
Granodiorite / Diorite (compositional estimate)
igneous
Quartzite
Silicon Dioxide (SiO2)
metamorphic
Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
igneous and metamorphic
Jasper (likely Lake Superior Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary (silica-rich mineral variety)
River Cobble (likely Metasedimentary)
Metasedimentary Rock / Quartz-rich Sandstone
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartz Cluster (Likely Ferruginous)
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt (or Andesite) Pebble
Porphyritic Mafic Volcanic Rock
igneous
Sandstone
Arenite
sedimentary
Chert (River Siltstone/Quartzite)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 dominant staining)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Vesicular basalt (scoria-like volcanic rock)
Basalt, predominantly plagioclase + pyroxene ± olivine; vesicular variety
igneous
Weathered iron-rich basalt or volcanic breccia
Mafic volcanic rock, likely basalt; composition dominated by plagioclase and pyroxene with iron oxides
igneous
Polished pink banded agate
Microcrystalline quartz (chalcedony), SiO₂
mineral
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Orange Quartzite Pebble
Quartzite (SiO2)
metamorphic
Tumbled brown quartz/chalcedony (probable)
Quartz, SiO₂; possibly brown chalcedony or jasper
mineral
Calcite (likely chalky calcite fragment)
Calcite, calcium carbonate (CaCO₃)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
organic mineraloid
Tumbled black stone, likely basalt
Basalt; fine-grained plagioclase–pyroxene rock, possibly with magnetite
igneous
Greenstone / altered mafic rock
Likely chlorite–actinolite metabasalt (greenschist); exact identification requires testing
metamorphic
Likely vesicular basalt (scoria)
Basaltic scoria; chiefly plagioclase, pyroxene, and olivine with vesicles
igneous
Shale or Siltstone
Fine-grained siliciclastic sedimentary rock
sedimentary
Pale rounded quartz-rich pebble, likely quartzite
Quartzite (mostly microcrystalline SiO₂), possibly quartz-rich sandstone or vein quartz
metamorphic
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Ocellar Rhyolite
Rhyolite (featuring orbicular/ocellar quartz and feldspar textures)
igneous
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Quartz-rich rock, possibly milky quartz or quartzite
Quartz (SiO₂), potentially quartzite if the grainy texture is rock-wide
mineral
Weathered fine-grained stone, likely sandstone or quartzite
Quartz-rich sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂
sedimentary