Jasper Pebble
Microcrystalline Quartz (SiO2)
Category
Browse man made composite (lithified equivalent of sedimentary) specimens identified by the Rock Identifier community.
Jasper Pebble
Microcrystalline Quartz (SiO2)
Granite
Granite (Felsic intrusive igneous rock)
Quartz
Silicon Dioxide (SiO2)
Quartz Heart or Arrowhead Shape
Silicon Dioxide (SiO2)
Black Agate
Silicon Dioxide (SiO2) with carbon/iron inclusions
Hematite Mineral Ore
Iron(III) oxide (Fe2O3)
Rugose Coral (Horn Coral) Fossil in Limestone
Order Rugosa (commonly Grewingkia or Zaphrentis genus)
Sandstone
Arenite (SiO2 with minor iron oxides)
Potassium Feldspar
Orthoclase (KAlSi3O8)
Banded Iron Formation (BIF)
Banded Iron Formation (BIF), SiO2 / Fe2O3
Quartz Pebble
Silicon Dioxide (SiO2)
Magnetite (Iron Ore)
Magnetite (Fe3O4)
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
Tumbled pale green mineral specimen, likely calcite
Calcite (CaCO₃), tentative identification
Biotite-rich gneiss (probable)
Foliated quartz–feldspar–biotite gneiss; composition commonly includes quartz (SiO₂), feldspar, and biotite mica
Chert / Flint (a variety of Chert)
Chert (SiO2)
Fossiliferous Limestone
Carbonate Rock (CaCO3 with organic inclusions)
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
Sandstone (River Rock)
Arenite (SiO2 principal component)
Emerald (Rough)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
Fluorite
Calcium Fluoride (CaF2)
Fluorite on Matrix
Calcium Fluoride (CaF2)
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
Pink Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeO oxides)
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
Dalmatian Jasper
Peralkaline Quartz Feldspar Porphyry
Chert
Chert (SiO2)
Rock salt (Halite)
Halite (Sodium Chloride, NaCl)
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
Massive White Quartz
Silicon Dioxide (SiO2)
Quartz (Grain)
Silicon Dioxide (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Chert (Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
Chert with Asphaltum (or Tar)
Silica (SiO2) with natural Bitumen/Asphaltum
Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Selenite (Satin Spar)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
Sandstone with Dendritic Inclusions
Quartzose Sandstone
Bornite
Bornite (Cu5FeS4)
Hematite
Hematite (Iron (III) oxide, Fe2O3)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)