Sedimentary (Chemically Precipitated Mineral)

Chert (Chert Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Yellow Jasper (Limonite-stained Chert)

Silicon Dioxide (SiO2) with Limonite/Goethite inclusions

Graphite

Graphite (Native Carbon, C)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Glauconitic Sandstone (Greensand)

Glauconitic Sandstone ((K, Na)(Fe3+, Al, Mg)2(Si, Al)4O10(OH)2)

Chert (Hagstone/Adder Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within a metamorphic matrix

White Salt Crystal Lamp (Halite)

Halite (Sodium Chloride, NaCl)

Mookaite Jasper

Siliceous (chert) sedimentary rock, a form of Jasper

Chert (Arrowhead Fragment)

Microcrystalline Quartz (SiO2)

Rough Quartz (or Quartzite pebble)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Green Fluorite

Calcium Fluoride (CaF2)

Septarian Nodule

Septarian Concretion

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Azurite Geode

Azurite (Cu3(CO3)2(OH)2)

Gold (in Opaque Matrix/Jewelry)

Native Gold (Au)

Azurite and Malachite on Matrix

Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)

Green Aura Quartz

Silicon Dioxide (SiO2) bonded with metallic vapors (typically Gold, Chromium, or Titanium)

Chert (Nodule)

Silicon Dioxide (SiO2)

Geodal Limestone / Calcite Druze

Calcium Carbonate (CaCO3)

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Limonite Pseudomorph after Pyrite

Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2

Blue Onyx (Dyed Agate)

Cryptocrystalline Quartz (SiO2) with artificial pigment

Honey Calcite (Yellow Calcite)

Calcium Carbonate (CaCO3)

Banded Sandstone

Arenite with Liesegang banding

Bauxite / Iron-rich Laterite

Laterite (principally Al(OH)3, Fe2O3, and SiO2)

Malachite

Copper carbonate hydroxide, Cu2CO3(OH)2

Quartz with Arsenopyrite

Silicon Dioxide (SiO2) with Iron Arsenic Sulfide (FeAsS)

Quartzite

Quartzite (Primary mineral: Silicon Dioxide, SiO2)

Chert (Green variety)

Microcrystalline Opaline/Quartz (SiO2)

Chert (variations include Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Uraninite (Pitchblende)

Uranium dioxide (UO2)

Malachite

Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite

Granite (Phaneritic Igneous Rock / Quartz, Feldspar, Mica)

Orange Calcite Sphere

Calcium Carbonate (CaCO3)

Quartz

Quartz (Silicon Dioxide - SiO2)

Banded Agate (River Stone)

Agate (Silicon Dioxide - SiO2)

Milky Quartz Vein with Iron Staining

Silicon Dioxide (SiO2)

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities