Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
Category
Browse sedimentary (physico chemical precipitate) specimens identified by the Rock Identifier community.
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Chert (with Liesegang Banding)
Microcrystalline quartz (SiO2)
Dinosaur Bone
Agatized Dinosaur Bone
Red Jasper or Ironstone concretion
SiO2 or Fe2O3
Quartz
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Green Opal
Hydrated Silica (SiO2·nH2O)
Chert (specifically Zebra Chert/Flint)
Silicon Dioxide (SiO2)
Yellow Calcite
Calcium Carbonate (CaCO3)
Quartz
Silicon Dioxide (SiO2)
Milky quartz crystal cluster
Quartz (silicon dioxide, SiO₂)
Quartz
Quartz (SiO2 - Silicon Dioxide)
Blue Agate (likely dyed)
Silicon Dioxide (SiO2)
Cave (botryoidal) aragonite or calcite specimen
Aragonite (CaCO₃), possibly mixed with calcite and iron-oxide inclusions
Jasper
Silicon Dioxide (SiO2), Microcrystalline Quartz
Travertine (often colloquially called Tufa)
Chemical Sedimentary Calcium Carbonate (CaCO3)
Fluorite, Turquoise, and Calcite set
Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)
Quartz Pebble
Silicon Dioxide (SiO2)
Quartz (Small Grains)
Silicon Dioxide (SiO2)
Quartz crystal cluster
Quartz, silicon dioxide (SiO₂), likely milky quartz with drusy crystals
Quartz (Chert/Quartzite variant)
Silicon Dioxide (SiO2)
Quartz (Clear or Milky)
Silicon Dioxide (SiO2)
Quartz Geode
Silicon Dioxide (SiO2)
Agate and Amethyst (Quartz variants)
Silicon Dioxide (SiO2) - Microcrystalline Quartz and Crystalline Quartz
Celestite Geode
Celestine (Strontium Sulfate, SrSO4)
Quartz
Silicon Dioxide (SiO2)
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
Agate (Geode nodule)
Cryptocrystalline Quartz (SiO2)
Chert (Jasper/Flint variety)
Sedimentary silica (SiO2)
Chert (Flint Nodule)
Silicon Dioxide (SiO2)
Chert Nodule or Concretion
Microcrystalline Quartz / Sedimentary Nodule
Quartz Pebble
Silicon Dioxide (SiO2)
Orange calcite crystal
Calcite, calcium carbonate (CaCO₃)
Quartz (Milky/Clear)
Silicon Dioxide (SiO2)
Quartz Geode
Silicon Dioxide (SiO2)
Geode (Unopened)
Silica-rich Concretion (SiO2)
Flint
Chert (SiO2)
Jasper / Chert nodule
Microcrystalline Quartz (SiO2)
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)