Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Quartz Geode

Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Quartzite with inclusions

Metamorphosed Quartz-rich Rock (SiO2)

Copper Ore with Chrysocolla and Azurite

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / Cu3(CO3)2(OH)2 (Azurite)

Limestone (specifically Dolomitic/Crystalline Limestone)

Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)

Agate Nodule (partially vuggy Quartz)

Silicon Dioxide (SiO2)

Diabase (also known as Dolerite)

Diabase

Chrysocolla

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Chert (Arrowhead variety)

Chert (SiO2)

Brecciated Chert

Brecciated Chert (Microcrystalline Quartz, SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Banded Agate / Lace Agate

Agate (Silica/Quartz) - SiO2

Milky or Iron-Stained Quartz

Quartz (Silicon Dioxide, SiO2)

Basalt with Quartz Vein and Weathering Crust

Amygdaloidal or Porphyritic Basalt

Limonite (Bog Iron)

Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O

Quartz / Quartzite

Silicon Dioxide (SiO2)

Limonite (Yellow Ochre)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Chert (and Limestone)

Silicon Dioxide (SiO2)

Glauconitic Sandstone (Greensand pebble)

Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Granite Pebble (Weathered)

Phaneritic Felsic Igneous Rock

Agate

Silicon dioxide (SiO2) - variety Chalcedony

Blue Sapphire

Corundum (Al2O3)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Chert (Iron-stained)

Chert (SiO2)

Jasper

Quartz (SiO2) with impurities

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Pink Dyed Agate (Pink Agate Slice)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Rhodochrosite

Manganese carbonate (MnCO3)

Jasper River Stone

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

Chert (or Flint)

Chert (Sedimentary Cryptocrystalline Sio2)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - variety of Chalcedony

Malachite

Malachite (Copper Carbonate Hydroxide) - Cu2CO3(OH)2

Agate

Silicon dioxide (SiO2)

Basalt with Quartz/Feldspar Inclusion

Basalt (containing Silicate minerals such as SiO2 and (Ca,Na)(Al,Si)4O8)

Quartz Pebble (Citrine-colored or Stained Quartz)

Silicon Dioxide (SiO2)

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Vesicular Sandstone

Clastic Sedimentary Rock (Sandstone)

Quartz Pebble (with Iron Inclusions)

Silicon Dioxide (SiO2)

Quartz Pebble (Water-Worn)

Silicon Dioxide (SiO2)

Chert Pebble (Flint)

Microcrystalline/Cryptocrystalline Quartz (SiO2)