Sedimentary (Secondary Mineral) Within Igneous

Kyanite

Kyanite (Al2SiO5)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variously known as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pyrite

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Black Marble

Recrystallized Carbonate Rock (CaCO3)

Gneiss (specifically a water-worn pebble)

Gneiss

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Banded Agate Geode

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Amethyst

SiO2 (Silicon Dioxide)

Gneiss

High-grade metamorphic rock (Gneiss)

Chlorastrolite (Greenstone)

Chlorastrolite (variety of Pumpellyite) - Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2 · H2O

Prehnite

Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Gold Flakes in Oil (Novelty Specimen)

Native Gold (Au)

Quartz Pebble

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Milky Quartz with Epidote or Chlorite inclusions

Silicon Dioxide (SiO2) with inclusions of Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Pyrite

Iron Sulfide (FeS2)

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Jasper

Jasper (Silicified microcrystalline quartz) - SiO2

Fossilized Shark Tooth

Otodus obliquus (Mackerel Shark)

Amphibolite (specifically Hornblende Schist/Gneiss)

Amphibole-rich Metamorphic Rock

Banded Gneiss with Quartz Vein

Foliated Metamorphic Rock (Gneiss)

Moonstone

Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (variant Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Greenstone (Epidote/Chlorite Schist)

Metabasalt (composed primarily of Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH) and Chlorite (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)

Quartzite with Hematite staining

Quartzite (SiO2) with iron oxide inclusions

Gneiss

High-grade foliated metamorphic rock

Copper-bearing Quartz (likely Chrysocolla or Malachite staining)

Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock

Agate (specifically Botswana or Lake Superior style chalcedony)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Common Opal/Chalcedony mix)

Microcrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)

Chert (Nodule)

Cryptocrystalline Quartz (SiO2)