Black Onyx
Cryptocrystalline quartz (SiO2)
gemstone
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Secondary Classification: Cryptocrystalline Quartz) in the encyclopedia
View all →
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (River Pebble)
Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite and Goethite (Ironstone)
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Geode Nodules / Keokuk Geode
Quartz / Chalcedony Geode (SiO2)
sedimentary
Variscite in Matrix
Variscite (AlPO4 · 2H2O)
mineral
Chalcedony (Quartz Pebbles)
Silicon Dioxide (SiO2)
mineral
Brown Chalcedony (Agate/Jasper)
Cryptocrystalline Quartz (SiO2)
mineral
Chert (Siltstone / Flint)
SiO2 (Cryptocrystalline Quartz)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within Sedimentary host rock
mineral
Yellow Jasper
Silicon dioxide (SiO2)
sedimentary
Chrysocolla
Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Red Jasper
Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Agate (specifically a Yellow/Honey Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / River Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Amygdaloidal Basalt (or Orbicular/Vesicular Basalt)
Basalt with quartz/agate amygdules
igneous
Chert
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert Concretion
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint with Chalk/Calcite)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Flint / Chert Nodule
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert / Flint (Brecciated or Fossiliferous Limestone with Silicification)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert (often called Flint when dark)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert / Jasper
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (v. Flint)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Agate
Sedimentary Cryptocrystalline Quartz (SiO2)
mineral
Chert (variably Oolitic or Fossiliferous)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Banded Chert
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary