Dalmation Stone
Peralkaline Rock (mixed silicate minerals)
igneous
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Quartz Pebble (Hag Stone / Adder Stone)
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Sandstone Cobble with Liesegang Rings
Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Pyrite in Matrix (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Banded Agate (Pink/Peach Chalcedony)
Agate (Silicon Dioxide, SiO2)
mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz crystals on a Matrix base (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (likely a clear or rock crystal variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Amygdaloidal Basalt
Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)
igneous
Limonite (Ochreous)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Orange Quartzite (Tumbled)
Quartzite (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Banded Agate (Yellow Agate)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Chert (Fossiliferous)
Silicon Dioxide (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Kyanite in Quartz
Al2SiO5 in SiO2
metamorphic
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Sulfur
Native Sulfur (S8)
mineral
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Rock Crystal Quartz
Quartz (SiO₂)
Mineral
Chert (varieties: Flint or Chalcedony)
Microcrystalline silica (SiO2)
sedimentary
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
igneous
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Carnelian
Carnelian Agate (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper, possibly Brecciated Jasper or Ocean Jasper due to patterns and color
Silicon Dioxide (SiO2), a variety of Chalcedony
Sedimentary Rock
Chert (Agatized)
Silicon dioxide (SiO2)
sedimentary
Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral
River Stone (likely Quartzite or Chert)
Recrystallized Silicon Dioxide (SiO2)
metamorphic
River Rock (Quartzite/Chert conglomerate)
Quartzite (SiO2)
metamorphic