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

Heliotrope (Bloodstone)

Silicon dioxide (SiO2) with inclusions

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Sandstone (SiO2 with iron oxide inclusions)

Basalt River Stone

Basalt (Mafic volcanic rock, primarily Plagioclase and Pyroxene)

Granite

Granite (Phaneritic igneous rock)

Ferruginous Sandstone (Gerrit)

Arenite with Iron Oxide cementation

Quartzite River Rock

Quartzite

Glacial Cobble (likely Granitic or Gneissic)

Granite/Gneiss Glacial Erratic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Quartz (Milky Quartz Pebble)

Silicon Dioxide (SiO2)

Basalt (with possible Calcite/Quartz veining)

Afanitic Mafic Igneous Rock

Orange Calcite and White Calcite

Calcium Carbonate (CaCO3)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Rhodochrosite

Manganese Carbonate (MnCO3)

Basalt (Crushed Roadstone)

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Banded Calcite (often sold as Mexican Onyx)

Calcium Carbonate (CaCO3)

Ferruginous Quartz (Iron-stained Quartz)

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

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of iron oxide)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Quartzite (River Pebble)

Quartzite (SiO2)

Blue Apatite

Apatite group (Ca5(PO4)3(F,Cl,OH))

Fluorite (Rainbow, Purple-Blue Tumbled)

Calcium Fluoride (CaF2)

Jasper with Chalcedony

Silicon Dioxide (SiO2)

Sandstone (likely Ferruginous)

Arenite (SiO2 based with Fe2O3/FeO(OH) cement)

Limestone

Calcium Carbonate (CaCO3)

Gneiss (specifically a Banded Gneiss pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Quartzite

Quartzite (Primary mineral: Quartz, SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Granite

Granite (Phaneritic Igneous Rock)

Quartzite with Iron Inclusions

Quartzite (primarily SiO2)

Pink Granite

Granite (Phaneritic intrusive igneous rock dominated by Quartz and K-Feldspar)

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Conglomerate (or Breccia)

Clastic Sedimentary Rock (Conglomeratic)

Moqui Marble (Shaman Stone)

Ironstone Concretion (Fe2O3) - primarily Hematite or Goethite shell with Sandstone core

Graywacke (River Cobble)

Graywacke (Lithic Sandstone)

Quartzite

Quartzite (SiO2)

Chert (Quartzite-rich River Pebble)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Rose Quartz

Silicon Dioxide with traces of titanium, iron, or manganese (SiO2)

Basalt with Secondary Mineral Inclusions

Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Banded Onyx (Mexican Onyx / Travertine)

Calcite (CaCO3) - Banded Travertine