Man Made Composite (Lithified Equivalent Of Sedimentary)

Limestone (Weathered)

Calcium Carbonate (CaCO3)

Chert (specifically Iron-stained or Jasperoid Chert)

Microcrystalline Quartz (SiO2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Rough Quartz (or Quartzite pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Banded Iron Formation (BIF)

Banded Iron Formation (Fe2O3 + SiO2)

Chert (Grey Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Oolitic Limestone

Oolitic Carbonate (CaCO3)

River Cobble (Quartzite-rich Sandstone)

Clastic Sedimentary Rock (Litharenite/Quartzite transition)

Breciated Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Sandstone (Red Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)

Zebra Jasper

Tumbled Opaque Chalcedony (SiO2)

Moss Agate

Agate (Silicon Dioxide, SiO2) with dendritic inclusions

Blue Calcite

Calcium Carbonate (CaCO3)

Limonite-pseudomorph after Pyrite (Prophecy Stone)

Goethite and Limonite secondary minerals (FeO(OH)·nH2O) replacing Pyrite (FeS2)

Desert Varnish (on Sandstone)

Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)

Dendritic Jasper

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Celestine (or Celestite)

Strontium sulfate (SrSO4)

Fancy Jasper

Silicon dioxide (SiO2)

Chert (Iron-stained)

Chert (SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and mineral impurities

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Chert (and its variety Flint)

Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Chert (Chert / Flint nodule)

Silicon Dioxide (SiO2)

Granite (weathered)

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Fluorite (Green Fluorite)

Fluorite (Calcium Fluoride, CaF2)

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Clear Quartz (Rock Crystal Fragments)

Silicon Dioxide (SiO2)

Blue Calcite

Calcite (CaCO3)

Chert (Nodular or Fossiliferous)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

White Quartz (Milky Quartz)

Quartz (Silicon Dioxide, SiO2)

Jasper (Red Jasper with Quartz veins)

Jasper (Silicon Dioxide, SiO2)

Tree Agate

Silicon Dioxide (SiO2) with Chlorite/Manganese inclusions

Echinoid Fossil (Sea Urchin)

Echinoidea (specifically likely Schizaster or similar genus), calcium carbonate (CaCO3)

Jasper (specifically Picture Jasper or Landscape Jasper)

Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Mexican Crazy Lace Agate

Silicon Dioxide (SiO2) with iron and aluminum inclusions