Tumbled yellow jasper or petrified wood fragment
Microcrystalline quartz (chalcedony), SiO₂, possibly iron-oxide-bearing jasper
mineral
Category
Mineral (Specifically A Variety Of Chalcedony, Which Is Microcrystalline Quartz)
Browse mineral (specifically a variety of chalcedony, which is microcrystalline quartz) specimens identified by the Rock Identifier community.
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Yellow Jasper
Silicon Dioxide (SiO2) with Iron inclusions
sedimentary
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Orbicular Jasper
Silicon Dioxide (SiO2), variety of Chalcedony
Mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Quartz Pebbles)
Silicon Dioxide (SiO2)
mineral
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Mineral/Sedimentary Rock Feature
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony (specifically Blue Chalcedony or Common Opal variety)
Silicon Dioxide (SiO₂)
mineral
Tree Agate (or Moss Agate), faceted into a crystal tower
Dendritic Agate (Silicon Dioxide, SiO2)
Mineral
Chrysoprase
Chalcedony (cryptocrystalline SiO2 variety)
Mineral
Jasper
Microcrystalline Quartz (SiO2)
Sedimentary/Mineral
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Chert / Flint
Cryptocrystalline Quartz (SiO2)
sedimentary
Chalcedony (specifically Agate or Carnelian variety)
Cryptocrystalline Silica (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions
sedimentary
Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
sedimentary
Chrysoprase-bearing Quartz
Silicon Dioxide with Nickel Inclusions (SiO2)
mineral
Banded Agate (specifically Lake Superior Agate style)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Banded Agate
Agate (chalcedony variety of Silicon Dioxide, SiO2)
mineral
Chalcedony (likely agate/chert fragment)
Microcrystalline quartz, SiO₂
mineral
Dalmatian Stone
Aplite (often incorrectly called Dalmatian Jasper)
igneous
Carnelian (red chalcedony)
Chalcedony, microcrystalline quartz (SiO₂), iron-oxide colored variety
gemstone
Dyed Agate Slice
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Blue Lace Agate
Chalcedony (SiO2) with trace minerals
mineral
Jasper (specifically Red or Brecciated Jasper variant)
Jasper (Microcrystalline Quartz - SiO2)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Polished brown jasper
Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich variety
mineral
Blue Chalcedony (Blue Lace Agate variety)
Silicon Dioxide (SiO₂)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Black Onyx
Silicon dioxide (SiO2)
mineral
Yellow Jasper
Silicon dioxide (SiO2)
sedimentary
Carnelian Agate
Chalcedony (SiO2 with Iron Oxides)
sedimentary
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Mineral (specifically a cryptocrystalline variety of Quartz)
Carnelian
Carnelian (a variety of Chalcedony, SiO2)
Mineral
Agate (specifically Botswana or Lake Superior style chalcedony)
Silicon Dioxide (SiO2)
mineral
Polished brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and pale silica-rich fragments
mineral
Jasper
Silicon dioxide (SiO2) with iron impurities
sedimentary
Rhyolitic jasper / brecciated jasper
Silica-rich volcanic rock, chiefly microcrystalline quartz (SiO₂), with iron-oxide and clay/mineral impurities
igneous
Yellow Jasper
Chalcedony (Silicon Dioxide, SiO2)
sedimentary