Botryoidal Quartz Cluster (Druzy Stalactitic Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Yellow Calcite (Banded)
Calcium Carbonate (CaCO3)
mineral
Sandstone (likely Siltstone)
Arenite or Siltstone (high SiO2 content)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a secondary sedimentary structure
sedimentary
Smoky Quartz with Chert
Silicon Dioxide (SiO2)
mineral
Limestone with Chert
Sedimentary Rock (CaCO3 with SiO2 inclusions)
sedimentary
Tumbled green aventurine
Quartz variety, mainly SiO₂ with fuchsite or other mica inclusions
mineral
Pink Granite
Granite (composed primarily of potassium feldspar, quartz, plagioclase feldspar, and biotite/amphibole)
igneous
Flint (Chert Flake / Drill Tool)
SiO2 (Microcrystalline Quartz)
sedimentary
Small rounded stone, likely basalt or weathered mafic rock
Fine-grained basalt; exact identification requires testing
igneous
Polished brown mineral fragment, likely quartz-rich iron-stained material
Possibly quartz (SiO₂) with iron-oxide inclusions; exact identification is uncertain from the image
mineral
Biotite-rich granite or granitic gneiss
Granite, chiefly quartz + feldspar + biotite mica; possibly weakly gneissic
igneous
Quartz with Tourmaline Inclusions
Silicon Dioxide with complex boro-silicate (SiO2 + Na(Fe3+Al6)(BO3)3Si6O18(OH)4)
mineral
Granite
Granite
igneous
Quartz with Mica and Feldspar
Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)
igneous
Calcareous Tufa (or Travertine)
Calcium Carbonate (CaCO3)
sedimentary
Beryl (likely Aquamarine or Heliodor variant)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Fossilized Shell in Limestone
Carbonate sedimentary rock with Bivalvia or Brachiopoda remains
fossil
River Pebble (Quartzite/Chert)
Silicon Dioxide (SiO2)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Banded Chert / Cryptocrystalline Quartz
Silicon Dioxide (SiO2)
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz or Calcite Pebble
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Land Snail Shell
Gastropoda (Calcium Carbonate, CaCO3)
fossil
Granite (River-worn Pebble)
Phaneritic Igneous Rock (Granitic composition)
igneous
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
River Quartz Cobble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble with Chert
Silicon Dioxide (SiO2)
mineral
Chert / Fossiliferous Limestone
Sedimentary Chert (often containing CaCO3 or SiO2 replacements)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Banded Calcite (Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Potassium Feldspar (Orthoclase)
KAlSi3O8
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Riverstone Jasper (Chert variant)
Silicon Dioxide (SiO2) with impurities
sedimentary
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Granite (Pink/Red Granite)
Phaneritic Felsic Igneous Rock
igneous
Granite or Porphyritic Igneous Rock (weathered)
Granitoid
Igneous
Pink Granite
Granite (Phaneritic Igneous Rock, primarily SiO2)
igneous
Milky Quartz or Moonstone
Silicon Dioxide (SiO2) or Potassium Aluminum Silicate (KAlSi3O8)
mineral
Chalcedony (River Stone)
Microcrystalline Quartz (SiO2)
mineral
Kyawthuite
Kyawthuite (Bi3+Sb5+O4)
mineral