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

Sandstone with Bedding Planes

Arenite (Sedimentary rock composed primarily of sand-sized minerals)

Sandstone with Ironstone Banding

Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)

Granite

Granite (Phaneritic Igneous Rock)

Epidote with quartz/feldspar

Epidote, Ca2(Al,Fe)3(SiO4)3(OH)

Sandstone (with Feldspathic/Arkose qualities)

Arenite (primarily SiO2 with KAlSi3O8 components)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Banded Calcite (often sold as 'Ocean Jasper' or 'Caribbean Calcite' variant)

Calcium Carbonate (CaCO3) with potential Aragonite inclusions

Agate (Geode nodule fragment)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Sandstone (Ferruginous)

Arenite (Fe-rich)

Jasper Conglomerate (specifically Puddingstone)

Jasper Conglomerate (Siliceous sedimentary rock)

Quartz Druzy Geode

Silicon Dioxide (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Ocean Jasper

Silicon Dioxide (SiO2) with various inclusions

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Peridotite (Dunite)

Peridotite (mostly Olivine: (Mg,Fe)2SiO4)

Halite (Rock Salt)

Halite; NaCl (Sodium Chloride)

Quartz pebble

Silicon Dioxide (SiO2)

Banded Calcite (Mexican Onyx)

Calcite (CaCO3)

Granite

Granite (phaneritic felsic intrusive rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Collection of Minerals and Ores

Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)

Thunderegg

Agate-filled Rhyolitic Nodule (SiO2)

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Carnelian Agate Nodule

Silicon Dioxide (SiO2) - Carnelian Chalcedony

Quartz (specifically Milky Quartz/Quartzite)

Silicon Dioxide (SiO2)

Jasper and Chert Conglomerate

Ferruginous Microcrystalline Quartz (SiO2)

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix

Chert Pebble

Microcrystalline or cryptocrystalline Quartz (SiO2)

Ferruginous Quartz

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

Limestone

Calcium Carbonate (CaCO3)

Granite Cobble

Phaneritic Felsic Igneous Rock (Granite)

Limestone

Calcium Carbonate (CaCO3)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Granite Pegmatite

Phaneritic Plutonic Igneous Rock

Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert

Chert (microcrystalline quartz)

Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)