Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral Within A Sedimentary Rock
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Chert (within Limestone)
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Glauconitic Sandstone
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Gneiss (Hornblende/Biotite Gneiss)
Foliated Metamorphic Rock (Quartz-Feldspar-Amphibole/Mica matrix)
metamorphic
Chert (and/or Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
![Turquoise (Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]) — mineral](https://media.rockidentification.com/8e928afb-bd26-4377-ab19-28fd017f7b9f-thumbnail.jpg)
Turquoise
Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]
mineral
Shale with Limonite/Hematite Staining
Argillaceous sedimentary rock with Iron Oxides (FeO(OH)·nH2O / Fe2O3)
sedimentary
Yellow Chert or Jasper
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Druzy Quartz Geode (Partially Open)
Silicon Dioxide (SiO2) within Sedimentary Host Rock
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Chert nodules in Limestone
Microcrystalline Quartz (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Pyrite Geode (Sparkling Druzy)
Iron Sulfide (FeS2) in Sedimentary Nodule
mineral
Jasper with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Mineral
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Shale
Laminated Mudstone (Shale)
sedimentary
River Stone (Basalt or Siltstone)
Mafic Volcanic Rock or Clastic Sedimentary Rock
igneous or sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert Nodules in Sedimentary Rock
Microcrystalline Quartz (SiO2) within Clastic Matrix
sedimentary
Quartz (Druzy or Crystalline)
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Citrine Geode
Silicon Dioxide (Quartz variety, often heat-treated amethyst): SiO2
mineral
Fossiliferous Limestone
Biogenic Limestone containing marine invertebrate fossils
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)
sedimentary
Metaconglomerate
Protolith: Conglomerate (comprising SiO2, Al2O3, etc.)
metamorphic
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Garnet Schist
Almandine-Muscovite Schist
metamorphic
Conglomerate
Conglomerate rock
sedimentary
Chert (Septarian Concretion/Nodule)
Microcrystalline silica (SiO2) with carbonate mineral veining
sedimentary
Xenolith in Basalt
Mafic Igneous Rock with Felsic Inclusion
igneous
Geode (Chert or Quartz Nodule)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate (with Jasper pebble)
Conglomerate / Microcrystalline Quartz (Jasper)
sedimentary
Sandstone Concretion
Clastic Sedimentary Rock - Quartz Arenite / Sandstone
sedimentary
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral