Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Or Mineraloid If Microcrystalline)
Browse mineral (or mineraloid if microcrystalline) specimens identified by the Rock Identifier community.
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Iron-rich jasper (likely rough jasper/chert)
Microcrystalline quartz (SiO₂), colored by iron oxides
mineral
Limonite / Ironstone
FeO(OH)·nH2O
sedimentary
Polished agate (likely moss or plume agate)
Microcrystalline quartz, SiO₂ (chalcedony)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Chert (Common Opal or Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Quartz with Mafic Inclusions
Silicon Dioxide (SiO2) with host igneous matrix
igneous
Yellow Aventurine
Quartz (SiO2) with inclusions
mineral
Red Jasper
SiO2
mineral
Chalcedony (Agate / Quartz Beach Pebble)
Silicon Dioxide (SiO2)
mineral
Dalmatian Jasper (Dalmatian Stone)
Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)
igneous
Jasper (likely river-worn)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Limestone with Calcite Veins
Calcium Carbonate (CaCO3)
sedimentary
Banded Agate
Silicon dioxide (SiO2) - variety of Chalcedony
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Calcite/Aragonite and Clay/Mudstone)
sedimentary
Orbicular jasper (likely ocean jasper)
Silicified volcanic rock composed chiefly of microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Polished jasper pebble
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic
Fossilized Tooth
Vertebrate Fossilized Tooth (Mineralized Biogenic Material)
fossil
Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)
Jasper, microcrystalline quartz (SiO₂)
Sedimentary Rock
Dyed Dalmatian Jasper (Dalmatian Stone)
Perthitic Feldspar with Arfvedsonite inclusions
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
mineral
Chert with Quartz Veining
Microcrystalline silica (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodule (Fossiliferous Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Flint (Chert Flake / Drill Tool)
SiO2 (Microcrystalline Quartz)
sedimentary
Chert Nodules
Microcrystalline Quartz (SiO2)
sedimentary
Green agate (polished bead)
Chalcedony, microcrystalline quartz (SiO₂)
gemstone
Limonite Ironstone
Goethite-Limonite concretion / Iron oxide
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Septarian Nodule (Brown)
Septarian Concretion (Calcite, Aragonite, Limestone, and Barite)
sedimentary
Petrified Wood
Silicon Dioxide (SiO2) - Calcified / Silicified Wood
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Polished agate or jasper nodule
Microcrystalline quartz, SiO₂, likely chalcedony with iron-oxide and other mineral inclusions
mineral