Chert (often referred to as 'Jasper' when red)
Chert (microcrystalline quartz, SiO₂)
Sedimentary rock
Category
Sedimentary (Man Made)
Browse sedimentary (man made) specimens identified by the Rock Identifier community.
Fluorite (likely)
Calcium Fluoride (CaF2)
Mineral
Quartzite
Quartzite (SiO2)
Metamorphic
Garnet (likely Almandine, Pyrope, or a blend)
Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)
Mineral
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Crystal Quartz Beads (likely Clear Quartz)
Quartz (SiO₂)
Mineral
Epidote (or Epidote-rich rock)
Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).
Mineral, often found in metamorphic rocks but also in sedimentary and igneous rocks
Limonite (Iron Ore/Hydrated Iron Oxide)
Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))
Mineral
Chalk
Calcareous Ooze (composed primarily of coccoliths)
Sedimentary Rock
Jasper (likely a variety of Brecciated Jasper or a patterned variety)
Silicon dioxide (SiO2)
Mineral
Prasiolite and Quartz Crystal Cluster
Quartz (SiO2); Prasiolite is a variety of Quartz
mineral
Halite
Halite (NaCl)
Mineral
Quartzite
Quartzite (primarily composed of SiO O₂)
Sedimentary Rock
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Pyrite
Pyrite (FeS2)
Mineral
Quartz (Crystal/Druzy Quartz)
Quartz (SiO₂)
Mineral
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
Mineral
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
sedimentary (geologically classified as a variety of chalcedony/quartz)
Botryoidal Chalcedony
Chalcedony (SiO2)
Mineral
Banded Jasper (possibly "Picture Jasper")
Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)
Sedimentary rock (specifically a chemical sedimentary rock, or a chert if considered purely mineral aggregate)
Quartz
Silicon Dioxide (SiO₂)
Mineral
Quartz (likely)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz Crystal
Quartz (SiO₂)
Mineral
Quartz
Quartz (SiO2, Silicon Dioxide)
Mineral
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Puddingstone
Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)
Sedimentary
Quartz
Quartz (SiO2)
Mineral
Quartz (River Pebble)
Quartz (SiO₂ - Silicon Dioxide)
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 Agate (variety of Chalcedony)
Agate (SiO2)
mineral
Quartz (likely Jasper or Chert variety)
Quartz (SiO₂)
Mineral
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Clear Quartz (beads in a bracelet)
Quartz (SiO2)
Mineral
Aquamarine and clear quartz
Aquamarine (Be3Al2Si6O18), Quartz (SiO2)
Mineral
Red Chalcedony (likely dyed)
Chalcedony (a variety of Quartz), SiO2
Mineral (Cryptocrystalline Quartz)
Amethyst and Limestone
Amethyst (SiO2 - Silicon Dioxide) and Limestone (CaCO3 - Calcium Carbonate)
The purple specimen is a mineral (Amethyst); the white specimen is a sedimentary rock (Limestone or Marble).
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Petrified Wood
Silicified wood, primarily composed of Quartz (SiO2)
Mineral, often found in sedimentary deposits