Anthropogenic (Man Made Product Subject To Geological Processes)

Yellow Calcite

Calcium Carbonate (CaCO3)

Ferruginous Quartz

Iron-stained Quartz (Silicon Dioxide, SiO2 with Fe2O3 inclusions)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Ferruginous Sandstone

Ferruginous Clastic Sedimentary Rock

Obsidian (specifically Mahogany Obsidian)

Volcanic glass (high silica content, SiO2)

Pyrite in Matrix (Commonly called Fool's Gold)

Iron Sulfide (FeS2)

Lepidolite

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

Epidote

Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Chert Pebble/Nodule

Chert (a microcrystalline or cryptocrystalline sedimentary form of quartz, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

Pyrite

Iron Disulfide (FeS2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Grey Quartzite Pebble

Quartzite (primarily SiO2)

Native Gold Nugget

Native Gold (Au)

Quartz Crystal with Inclusions

Silicon Dioxide (SiO2)

Quartz (Milky or Cloudy variety)

Silicon Dioxide (SiO2)

Aragonite / Calcite Geode

Calcium Carbonate (CaCO3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Crushed Limestone

Sedimentary Carbonate Rock (CaCO3)

Blue Calcite

Calcium Carbonate (CaCO3)

Siltstone

Siltstone (primarily composed of microcrystalline Quartz and Feldspar)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Blue Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Coarse-Grained Marble

Recrystallized Limestone (Major component: CaCO3)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)