Mineraloid (Human Made Geological Specimen)

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide, SiO2)

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Malachite

Copper Carbonate Hydroxide [Cu2CO3(OH)2]

Chert (or Flint)

SiO2 (predominantly microcrystalline quartz)

Brown Agate

Silicon Dioxide (SiO2)

Chert (Green variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Blue Lace Agate (Geode/Druzy variant)

Chalcedony (SiO2) with Quartz druzy

Chert (Jasper/Flint variant)

Microcrystalline Quartz (SiO2)

Chrysocolla on Quartz/Rhyolite matrix

Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O

Aura Quartz

Titanium/Titanium-Gold treated Silicon Dioxide (SiO2)

Glauconitic Sandstone (Greensand pebble)

Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Amethyst Geode/Cluster

Quartz (SiO2) - variety Amethyst

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Quartz (Druzy) in host rock

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

Granite

Phaneritic plutonic rock (SiO2 typically >69%)

Chert (Flint)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Granite

Granite (Mainly Quartz, Feldspar, and Mica/Amphibole)

Chert / Chalcedony

Microcrystalline Quartz (SiO2)

Chert (Flint Nodules)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Honey Calcite (Yellow Calcite)

Calcium Carbonate (CaCO3)

Fluorite (Blue)

Calcium Fluoride (CaF2)

Quartz

Silicon Dioxide (SiO₂)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert / Pink Chert

Silicon Dioxide (SiO2)

Fluorite in Matrix

Fluorite (CaF2) within a host rock matrix

Amazonite

K(AlSi3O8) - Microcline variant

Chert (Arrowhead Artifact)

Chert (SiO2)

Ironstone Concretion / Limonite-stained Siltstone

Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)

Wonderstone (Liesegang Sandstone)

Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))

Galena

Lead Sulfide (PbS)

Gold

Native Gold (Au)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Hematite)

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Pyrite

Iron Disulfide (FeS2)

Chert (Yellow Jasper/River Pebble)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) - Opaque Chalcedony

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)