Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
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Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Granodiorite (Riverbed Cobble)
Granodiorite
igneous
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Agate Geode
Chalcedony (SiO2 - Silicon Dioxide)
sedimentary (secondary mineral formation)
Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Turquoise (possible Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Ironstone (Limonite/Goethite Concretion)
Ferruginous Sedimentary Rock (composed of Goethite FeO(OH) and Limonite)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Lepidolite (likely)
K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)
Mineral
Sulfur
Native Sulfur (S8)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)
igneous
Sandstone (Banded)
Arenite
sedimentary
Orange Calcite
Calcite (CaCO3)
Mineral
Chert (specifically Green Chert/Jasper)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Chert (Iron-Stained)
Microcrystalline Silica (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Malachite
Copper carbonate hydroxide Cu2CO3(OH)2
mineral
Chrysocolla
Chrysocolla; (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Quartz Druzy on Matrix (likely Agate or Jasper)
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Chert nodules in Limestone
Microcrystalline Quartz (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Pink Quartz
Silicon Dioxide (SiO2) with trace inclusions
mineral
Carnelian (Red Chalcedony)
SiO2 (Silicon Dioxide) with Iron Oxide impurities
mineral
Chert (Flint nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide impurities (Hematite)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron inclusions
mineral
Flint or Chert
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Glass or Slag Glass
Amorphous Silica (Anthropogenic Glass)
mineral
Jasper with Chalcedony
Silicon Dioxide (SiO2)
mineral
Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Dendritic Agate or Spotted Quartzite
Silicon Dioxide (SiO2) with inclusions
metamorphic
Herkimer Diamond (Quartz Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral