Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Category
Sedimentary Rock (Technically A Variety Of Chalcedony)
Browse sedimentary rock (technically a variety of chalcedony) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Technically A Variety Of Chalcedony) in the encyclopedia
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Blue Sapphire and Diamond (Set in Metal)
Corundum (Al2O3) and Diamond (C)
mineral
Jasper (likely Iron-stained)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Jasper (Green Jasper / Chert)
Silicon Dioxide (SiO2) with iron/clay inclusions
sedimentary
Raw rose quartz
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper (Quartz)
Silicon Dioxide (SiO2) with Iron impurities
sedimentary
Jasper
Silicon Dioxide (Quartz variety, SiO2)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Banded Calcite (often sold as 'Mexican Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Carnelian Agate
Carnelian (Silicon Dioxide: SiO2)
mineral
Tree Agate
Silicon Dioxide (SiO2) with dendritic inclusions
mineral
Riverstone Jasper (Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Brown Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Banded Jasper
Silicate Mineral (Microcrystalline Quartz / SiO2)
sedimentary
Black onyx or black agate cabochon
Cryptocrystalline chalcedony, SiO₂; likely black chalcedony/onyx, though dyed material is possible
gemstone
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite inclusions
sedimentary
Yellow Jasper
Silicon Dioxide with Limonite (SiO2 + FeO(OH)·nH2O)
sedimentary
Iron-rich chert or jasper
Microcrystalline quartz (SiO₂), commonly colored by hematite/goethite
sedimentary
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Agate (or Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert / Flint Nodule
Microcrystalline quartz (SiO2)
sedimentary
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Polished brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and pale silica-rich fragments
mineral
Blue Lace Agate (or similar Chalcedony)
SiO2 (Silicon Dioxide)
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Polished brecciated jasper
Jasper, a microcrystalline quartz variety (SiO₂), with iron-oxide staining and breccia fragments
mineral
Rainbow Moonstone (White Labradorite)
Labradorite (White varieties with Schiller effect), (Na,Ca)(Al,Si)4O8
gemstone
Chalcedony with Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Polished jasper pebble (possibly orbicular jasper)
Microcrystalline quartz (SiO₂), likely jasper; exact variety cannot be confirmed visually
igneous
Yellow Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral