Sedimentary (Secondary Classification For A Weathered Mineral Specimen)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Dioptase

Dioptase (CuSiO3 · H2O)

Chert (Iron-stained)

Microcrystalline silica (SiO2) with trace Iron oxide (Fe2O3)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Banded Agate (River Stone)

Agate (Silicon Dioxide - SiO2)

Quartz (Milky or Pink-tinged)

Silicon Dioxide (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Granite Pebble

Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)

Banded Chert

Cryptocrystalline Quartz (SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Quartz Pebble (with Mica or Iron staining)

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone Clast

Arenite (primarily SiO2)

Granitic Quartz (with Feldspar inclusions)

Quartz (SiO2) with Potassium Feldspar (KAlSi3O8)

Azurite and Malachite

Azurite (Cu3(CO3)2(OH)2) and Malachite (Cu2(CO3)(OH)2)

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Chert (specifically Pink/Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Sandstone Cobble with Liesegang Rings

Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Green Jasper

Silicon Dioxide (SiO2) with iron silicate inclusions

Jasper and Basalt (Mixed Breccia or Chert)

Silicon Dioxide (SiO2) with Ferromagnesian silicates

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartz Druse (on Chalcedony/Agate base)

Silicon Dioxide (SiO2)

Ferruginous Quartzite (also known as Ironstone or Gossan)

Ferruginous Quartzite with Goethite/Hematite staining

Chert (Yellow or Ochre Jasper variant)

Microcrystalline Quartz (SiO2)

Chert (River Pebble)

Microcrystalline silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Chert Nodule/Flint)

Chert (Silicon Dioxide, SiO2)

Azurite

Azurite (Cu3(CO3)2(OH)2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Argetine Blue Agate (Chalcendony variant)

Silicon Dioxide (SiO₂)

Chert (with Iron Staining)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Iron-stained or Jasperoid Chert)

Microcrystalline Quartz (SiO2)

Blue Calcite

Calcium Carbonate (CaCO3)

Quartz (Microcrystalline/Macro crystalline variety)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Chert Pebble

Microcrystalline or cryptocrystalline Quartz (SiO2)