Aragonite (Onyx Marble)
Aragonite / Calcium Carbonate (CaCO3)
mineral
Category
Sedimentary (Chemical)
Browse sedimentary (chemical) specimens identified by the Rock Identifier community.
Quartzite
Quartzite (SiO2)
metamorphic
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Marble (Calcitic)
Metamorphosed Limestone (CaCO3)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Brown Quartzite Pebble
Metadiagenetic Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble (Yellow/Cloudy Quartz)
Silicon Dioxide (SiO2) - Recrystallized Sandstone
metamorphic
Diorite (River Cobble)
Intermediate plutonic igneous rock
igneous
Dyed Pink Agate (Crackled)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Gold
Native Gold (Au)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Rough Quartz (Milky Quartz Pebbles)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Dyed Purple Agate
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz (Quarzite or Massive Quartz vein)
Silicon Dioxide (SiO2)
metamorphic
Andesite Porphyry
Andesite (extrusive volcanic rock)
igneous
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Fluorite (Durango Fluorite)
Calcium Fluoride (CaF2)
mineral
White Agate (Tumbled)
Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony
mineral
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Banded Agate (Lake Superior Agate type)
Agate (Cryptocrystalline Variety of Quartz, SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
mineral
Grey Agate (Banded Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Agate (Sliced Nodule)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Soapstone / Steatite
Steatite (primarily Talc, Mg3Si4O10(OH)2)
metamorphic
Rose Quartz (tumbled)
Rose Quartz (variety of Quartz, chemical formula SiO₂)
Mineral
Banded Agate (Polished Slice)
Chalcedony (cryptocrystalline Quartz), SiO2
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Cobaltoan Calcite / Pink Dolomite (Possible)
Cobaltoan Calcite: (Ca,Co)CO3; Pink Dolomite (or Thulite): CaMg(CO3)2 or Mn-Dolomite / (Thulite: Mn2+3Al2(Si2O7)(SiO4)O(OH))
Mineral / Rock (depending on purity)
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
Vesicular Basalt with Oxidation
Scoriaceous Olivine Basalt (Mafic volcanic rock)
igneous
Quartzite (Water-worn Cobble)
Quartzite (Composition: 90%+ SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Bull Quartz (Milky Quartz)
Quartz (Silicon Dioxide - SiO2)
mineral
Quartzite (River Pebble)
Metamorphosed sandstone (SiO2)
metamorphic
Quartz (Fieldstone/Pebble)
Silicon Dioxide (SiO2)
mineral