Chert
Chert (microcrystalline quartz, SiO2)
sedimentary
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Secondary Classification: Cryptocrystalline Quartz) in the encyclopedia
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Green Moss Agate / Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz with Iron and Manganese inclusions
sedimentary
Jasper
SiO2
Sedimentary
Chrysocolla on Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Brecciated Chert
Sedimentary Chert (SiO2) with Calc-Silicate mineralization
sedimentary
Agate
Silicon dioxide (SiO2) - variety of chalcedony
sedimentary
Blue Sapphire
Corundum (Al2O3 with trace amounts of iron and titanium)
mineral
Amygdaloidal Basalt
Basalt with Secondary Mineral Infillings
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Limonite stained Sandstone
Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chrysocolla
Chrysocolla - (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Basalt with Quartz Veins
Basalt (SiO2 range 45-52%)
igneous
Limestone (with possible Manganese oxide inclusions)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Flower Agate
Chalcedony (SiO2) with Scolecite/Opaque inclusions
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Banded Agate
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Blue Sapphire (Tumbled/Polished)
Corundum (Al2O3)
mineral
Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Mineral (Sedimentary context)
Quartz Geode (with Agate banding)
Silicon Dioxide (SiO2)
Sedimentary or Igneous (secondary formation)
Chert (or possibly Flint)
Chert (variant: Flint)
Sedimentary
Limonitic Iron Ore / Goethite
Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Agate (specifically Chalcedony/Banded Agate)
Silicon Dioxide (SiO2)
sedimentary
Gold
Gold (Native Element); Au
mineral
Quartz with Chalcedony
Silicon dioxide (SiO2)
mineral
Botryoidal Hematite (Kidney Ore)
Hematite (Fe2O3)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Amber
Succinite
Mineraloid
Carnelian Agate
Silicon Dioxide (SiO2) with iron impurities
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Turquoise
Turquoise - CuAl6(PO4)4(OH)8·4H2O
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Chert (often referred to as 'Jasper' when red)
Chert (microcrystalline quartz, SiO₂)
Sedimentary rock
Amygdaloidal Basalt
Amygdaloidal Basalt (extrusive volcanic rock)
Igneous
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Basalt with Calcite Veins
Basalt (containing CaCO3 inclusions)
igneous
Blue Lace Agate (Geode/Druzy variant)
Chalcedony (SiO2) with Quartz druzy
mineral
River Pebbles and Quartz
Mixed Igneous, Sedimentary, and Metamorphic Rocks (Silicon Dioxide SiO2 dominant)
mixed