Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
sedimentary
Category
Mineral (Specifically A Variety Of Chalcedony, Which Is A Cryptocrystalline Quartz)
Browse mineral (specifically a variety of chalcedony, which is a cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Rose Quartz
Rose Quartz (SiO2 with traces of Titanium, Iron, or Manganese)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Grain
Silicon Dioxide (SiO2)
mineral
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Fairburn Agate
Cryptocrystalline Quartz (SiO2)
mineral
Geode (Unopened)
Chalcedony/Quartz Geode (SiO2)
sedimentary
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Mineral (Variety of Quartz)
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Banded Chert or Chert with Quartz Veins
Chert (SiO2)
Sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)
Metamorphic Rock
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Yellow Jade (Yellow Chalcedony/Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (specifically Red Sandstone)
Arenite (primarily Quartz, SiO2)
sedimentary
Jasper (Red/Brown Variety)
Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Milk Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Tan/Grey)
Chert (Silicon Dioxide, SiO2)
sedimentary
Quartz Pebble (Iron-Stained)
Quartz (Silicon Dioxide - SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Red/Pink Jasper subtype)
Silicon Dioxide (SiO2)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - Carnelian variety of Chalcedony
mineral
Carnelian
SiO2 (Silicon Dioxide) - Carnelian variety of Chalcedony
mineral
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Gneiss (specifically Biotite Gneiss)
Gneiss (high-grade metamorphic rock primarily composed of Silicates)
metamorphic
Agate Geode
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Citrine
Yellow Quartz (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebbles
Silicon Dioxide (SiO2)
mineral