Sedimentary (Secondary Mineral) Within Igneous

Sunstone

Plagioclase Feldspar (containing (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions)

Pyrite

Iron Sulfide (FeS2)

Dendritic Agate or Manganese Nodule in Chert/Limestone

Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions

Porphyry

Porphyritic Igneous Rock

Flint

Silicon dioxide (SiO2)

Quartz Boulder

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Banded Agate (Tumbled)

Cryptocrystalline Quartz (SiO2)

Banded Chert / Chalcedony

Silicon Dioxide (SiO2)

Pyrite Concretion (Grapestone)

Iron Sulfide (FeS2) Concretion

Sandstone Cobble

Arenite (Secondary classification based on grain size)

Ironstone Concretion (Iron-rich Mudstone)

Siderite / Geothite concretion (FeCO3 / FeO(OH))

Malachite

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

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Turquoise

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

Amethyst Geode

Amethyst/Purple Quartz (SiO2)

Chalcedony / Agate Pebble

Silicon Dioxide (SiO2)

Porphyritic Igneous Pebble / Porphyry

Porphyritic Igneous Rock

Limonite (Yellow Ochre)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Chrysocolla

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

Chrysocolla (with Hematite/Iron Oxides)

Chrysocolla: (Cu, Al)2H2Si2O5(OH)4 · nH2O

Agate

Silicon dioxide (SiO2) - variety Chalcedony

Banded Agate

Silicon Dioxide (SiO2)

Amazonite

Microcline (KAlSi3O8) with Pb trace impurities

Larimar

Pectolite [NaCa2Si3O8(OH)] with copper substitution

Aventurine

Aventurine Quartz (SiO2 + Fuchsite mica)

Sunstone

Plagioclase Feldspar (Na, Ca)(Al, Si)4O8 with Hematite or Copper inclusions

Sandstone (Quartz-rich)

Arenite (SiO2)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Dalmatian Jasper (Dalmatian Stone)

Perthitic Feldspar with Arfvedsonite/Riebeckite

Ironstone concretion

Siderite or Limonite concretion (FeCO3 or FeO(OH)·nH2O)

Sandstone Concretion

Arenaceous concretion (primarily SiO2 with Fe2O3 staining)

Ironstone Concretion

Siderite or Hematite Concretion (FeCO3 or Fe2O3)

Bivalve Fossil (Internal Mold/Steinkern)

Class Bivalvia (Fossilized Mold)

Chert (and Fossiliferous Chert)

Silicon Dioxide (SiO2)

Fossilized Dinosaur Skull (Tyrannosaurus rex)

Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica

Purpurite

Manganese Iron Phosphate, Mn3+(PO4)

Chrysocolla

Cu2-xAlx(H2O)n(H2Si2O5)5 · nH2O (Hydrated copper aluminum silicate)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Brimstone (Native Sulfur)

Native Sulfur (S)