Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Category
Mineral (Variety Of Chalcedony)
Browse mineral (variety of chalcedony) specimens identified by the Rock Identifier community.
Learn about Mineral (Variety Of Chalcedony) in the encyclopedia
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Yellow Chalcedony / Carnelian
Silicon Dioxide (SiO2)
mineral
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Quartz geode
Microcrystalline quartz and drusy quartz (SiO₂), commonly lining a chalcedony-rich cavity
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Chert (Chalcedony nodule)
Silicon Dioxide (SiO2)
sedimentary
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
mineral
Orange Calcite
Calcite (CaCO3)
Mineral
Ocean Jasper
Orbicular Quartz (SiO2)
Mineral
Tree Agate
Dendritic Chalcedony (SiO2)
sedimentary
Polished banded agate slab or agate-look decorative stone
Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image
gemstone
Tree Agate
Silicon Dioxide (SiO2) with inclusions of Chlorite or Manganese
mineral
Polished ocean jasper / orbicular jasper
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
mineral
White Quartz Star
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood / Permineralized wood (SiO2)
fossil
Turritella Fossil
Turritella (Class Gastropoda, Family Turritellidae)
fossil
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Tree Agate
Dendritic Agate (Silicon Dioxide, SiO2 with chlorite inclusions)
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Flint / Chert Nodules in Limestone
Cryptocrystalline Quartz (SiO2) within Carbonate Rock
sedimentary
Tumbled jasper (likely ocean or orbicular jasper)
Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and dark accessory minerals
mineral
Jasper
Opaque Cryptocrystalline Quartz (SiO2)
sedimentary
Mixed Gemstone Bracelet
Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)
Mineral/Rock assemblage
Dendritic Agate
Chalcedony (Silicon Dioxide) with Manganese or Iron Oxide inclusions
mineral
Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)
N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)
Organic (if resin) or Synthetic (if glass); simulating Sedimentary or Metamorphic (for natural stones)
Chrysocolla (with Quartz and Malachite)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Amygdaloidal Basalt
Basalt (with filled vesicles/amygdules)
igneous
Agate (Fortification Agate)
Banded Chalcedony (SiO2)
mineral
Chert (Jasper/Chalcedony Pebble)
Silicon Dioxide (SiO2)
sedimentary
Moss Agate
Chalcedony (SiO2 with inclusions)
mineral
Milky Quartz Geode / Chalcedony Nodule
Quartz (Silicon Dioxide - SiO2)
mineral
Chalcedony / Agate with Botryoidal Quartz
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Agate (Dyed)
Silicon Dioxide (SiO2)
Sedimentary (formed from silica deposits)
Amethyst or Smoky Quartz Geode Slice
Crystalline Silicon Dioxide (SiO2) with iron impurities
mineral
Tumbled black-and-white stone, likely dendritic agate or jasper
Cryptocrystalline quartz (SiO₂), possibly chalcedony with manganese-oxide dendrites
mineral
Moss Agate / Green Jasper
Silicon Dioxide (SiO2) with chlorite/hornblende inclusions
mineral
Tumbled carnelian (red-orange chalcedony)
Carnelian, a cryptocrystalline variety of quartz: SiO₂
gemstone
Quartz / Chert
Silicon Dioxide (SiO2)
Mineral / Sedimentary