Yellow Jasper
Chalcedony (SiO2) with Goethite/Iron oxide inclusions
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.
Chert (with Quartz vein)
Chert (Silicon Dioxide, SiO2)
sedimentary
Fossil Coral
Coral Limestone (a type of biogenic sedimentary rock)
Sedimentary
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Moonstone (Feldspar variety)
Orthoclase Feldspar (KAlSi3O8)
mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite (Alkali-feldspar granite)
igneous
Chert (Common Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Cryptocrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline silica (SiO2)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Apatite group (Ca5(PO4)3(F,Cl,OH))
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Amazonite
Amazonite (KAlSi3O8 – a variety of Microcline, a Potassium Feldspar)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Turritella Agate (Calligrapher Stone)
Silicified Elimia tenera (Chalcedony/Quartz)
sedimentary
Quartz (likely macrocrystalline variety)
Quartz (SiO₂)
Mineral
Chert (Flint Nodules)
Microcrystalline quartz (SiO2)
sedimentary
Amethyst
Quartz variety; SiO2 (Silicon Dioxide)
Mineral
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Green Jasper with Quartz veins
Jasper (Silicon Dioxide, SiO2)
sedimentary
Green Aventurine (Carved)
Silicon Dioxide (Quartz variant) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O(OH)2)
mineral
Chert / Flint
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (often referred to as Flint or Jasper when pigmented)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) - Opaque Impure Chalcedony
sedimentary
Agate (Fortification Agate)
Banded Chalcedony (SiO2)
mineral
Chert (specifically Flint or Common Opal)
Silicon Dioxide (SiO2)
sedimentary
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Chert / Flint
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Quartz (Clear / Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of organic matter)
sedimentary
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
mineral
River Cobble (likely Sandstone or Siltstone type)
Sandstone or Siltstone (common rock types that form river cobbles)
Sedimentary Rock (specifically a clastic sedimentary rock formed into a cobble)
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Red Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Quartz Veined Rock (Likely Graywacke or Quartzite)
Silicon Dioxide (SiO2) veins in Metasedimentary matrix
metamorphic