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

Quartzite Cobble

Meta-quartzite (SiO2)

Sandstone with Quarzite clasts

Arenite (SiO2 based)

Limestone (with potential fossil inclusions)

Calcium Carbonate (CaCO3)

Sandstone (Banded)

Clastic sedimentary rock (primarily SiO2)

Chert (vuggy variety)

Microcrystalline silica (SiO2)

Quartz Veinated Sandstone or Siltstone

Silicon Dioxide (SiO2) within a clastic sedimentary matrix

Chert / Jasper

Sedimentary Cryptocrystalline Quartz (SiO2)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Bornite

Bornite (Cu5FeS4)

Note: No specimen visible

Druzy Quartz on Matrix

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Biogenic Inclusions

Septarian Nodule (Dragon Stone) sphere

Septarian concretion (Calcite, Aragonite, and Limestone)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)

Chert (or Flint)

SiO2 (predominantly microcrystalline quartz)

Clear Quartz (or Rock Crystal)

Quartz (SiO₂)

Corundum

Corundum (Al2O3)

Lapis Lazuli

Sodium aluminum silicate with sulfur (main component: Lazurite [(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2])

Amethyst

SiO2 (Silicon Dioxide)

Tree Agate

Dendritic Chalcedony (SiO2)

Limestone (River Pebble)

Calcium Carbonate (CaCO3)

Sandstone (Quartzite-rich Pebble)

Arenite (primarily SiO2)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Quartz

Silicon dioxide (SiO2)

Chert (specifically Flint or Jasper-Chert)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Amethyst Quartz (Tumbled)

Amethyst (Silicon Dioxide with iron impurities, SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Lapis Lazuli (polished cabochon)

Lazurite-rich rock (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2)

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Chert Pebble (Jasper/Quartz variety)

Microcrystalline Quartz (SiO2)

Banded Agate (Orca Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Chert (variations include Flint or Jasper)

Chert (Silicon Dioxide, SiO2)

Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert / Pink Chert

Silicon Dioxide (SiO2)

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Quartz

Quartz (SiO₂)

Fossiliferous Limestone (Crinoidal)

Calcium Carbonate (CaCO3) - Limestone containing bioclasts

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)