The Purple Specimen Is A Mineral (Amethyst); The White Specimen Is A Sedimentary Rock (Limestone Or Marble).

Yellow Jasper

Silicon dioxide (SiO2)

Travertine

Terrestrial Sedimentary Limestone (CaCO3)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Larimar

Blue Pectolite (NaCa2Si3O8(OH))

Jasper with Dendritic Inclusions

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Granite

Phaneritic plutonic rock (SiO2 + Al2O3)

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

Limonite after Marcasite (Propeller Conchoid)

Goethite/Limonite pseudomorph after Marcasite (FeO(OH)·nH2O)

Limestone Breccia

Sedimentary Breccia (Calcareous)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Corundum (Sapphire in Host Rock)

Corundum (Aluminum Oxide, Al2O3)

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (SiO2)

Chert (Jasper-rich)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Granite (Pink/Red)

Phaneritic Plutonic Felsic Rock (major minerals: Quartz, Orthoclase Feldspar, Plagioclase Feldspar)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Sandstone (Quartzose Sandstone)

Arenite

Granodiorite (Weathered)

Granodiorite

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Dragon Blood Jasper (Epidote with Piedmontite or Quartz)

Epidote-rich Quartzite / SiO2 with (Ca2(Al2,Fe)(Si2O7)(SiO4)O(OH))

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

White Onyx (Marble Onyx)

Calcite (CaCO3) - Banded Calcium Carbonate

Sandstone (Greywacke)

Clastic Sedimentary Rock (SiO2 with lithic fragments)

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Chert (Jasper variation)

Microcrystalline Quartz (SiO2)

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Granite

Granite (Felsic Intrusive Igneous Rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Gneiss (specifically Micaceous Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Yellow Quartzite (Onyx Pebble)

Silicon Dioxide (SiO2) - Quartzite

Banded Sandstone (Differential Weathering)

Clastic Sedimentary Rock (primarily SiO2)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Pink Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Granite Pebble (Weathered)

Phaneritic Felsic Igneous Rock

River Chalcedony / Agate

Chalcedony (Silicon Dioxide, SiO2)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)