Quartzite Pebble
Quartzite (SiO2)
metamorphic
Category
Man Made Rock (Technosol)
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
Learn about Man Made Rock (Technosol) in the encyclopedia
View all →
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Gastropod Shell
Gastropoda (Class)
sedimentary
River Rock
Sedimentary Rock (various compositions)
sedimentary
Geode or Concretion
Silica-filled nodule (likely SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper/Quartzite Pebble)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Uncertain small pale mineral fragment
Indeterminate; possibly calcite or a light-colored feldspar fragment
mineral
Rose Quartz
Rose Quartz (SiO2 with traces of Titanium, Iron, or Manganese)
mineral
Shale
Lutaceous Sedimentary Rock
sedimentary
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Quartz Geode
Crystalline Silver Oxide (SiO2) in Calcareous Host
mineral
Sandstone (likely Conglomerate or Gritstone)
Arenite (SiO2 based)
sedimentary
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Painted River Rock (likely Quartzite or Granite)
Quartzite or Granitic Gneiss (painted)
metamorphic
Migmatite
Migmatite (Mixed Rock)
metamorphic
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Basalt
Basalt (Ma-Fe Silicate)
igneous
Diorite (River Cobble)
Intermediate plutonic igneous rock
igneous
Shale
Argillaceous sedimentary rock
sedimentary
Rock Crystal Quartz
Silicon Dioxide (SiO2)
mineral
Biotite–quartz–feldspar gneiss
Gneiss, composed chiefly of quartz (SiO₂), feldspar, and dark mica, likely biotite
metamorphic
Peridotite (Olivine Rock)
Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)
igneous
Black basalt
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, pyroxene, and commonly olivine
igneous
Basalt
Extrusive Igneous Basalt (contains Plagioclase Feldspar and Pyroxene)
igneous
Quartz Vein Rock with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar
mineral
Basalt
Extrusive Igneous Rock
igneous
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Sandstone
Sandstone (various mineral compositions)
Sedimentary
Rounded weathered rock, likely basalt or andesite
Fine-grained mafic to intermediate volcanic rock; precise identification requires testing
igneous
Black Onyx
Chalcedony (SiO2)
gemstone
Black Tourmaline (Tumbled)
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Amethyst
Amethyst (SiO2 with Iron impurities)
mineral
Conglomerate
Polymictic clast-supported conglomerate, likely ferruginous
sedimentary
Amethyst Quartz Druse
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone
Arenite
sedimentary
Sandstone (lithic wacke/conglomerate mix)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Porphyritic Andesite
Andesite with Hornblende phenocrysts
igneous