Sedimentary (Secondary Mineral) Within Igneous

Amethyst

Amethyst (Silicon Dioxide, SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Carnelian (Red-Orange Chalcedony)

Silicon Dioxide (SiO2)

Silver (Native Silver)

Native Silver (Ag)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Yellow Quartz (Citrine Quartz or Yellow Jasper)

Silicon Dioxide (SiO2) with iron impurities

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in a Geodic structure

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Labradorite

Labradorite (Ca,Na)(Al,Si)4O8

Ironstone Concretion (Moqui Marble variety)

Ferruginous Sandstone Concretion

Quartz (Druzy Quartz)

Silicon Dioxide (SiO2)

Ironstone (likely siderite or goethite-rich siltstone)

Ferruginous Siltstone

Red Rhyolite Porphyry

Rhyolite (Porphyritic texture)

Labradorite

Labradorite (Plagioclase Feldspar Series: (Ca,Na)(Al,Si)4O8)

Diabase (Greenstone)

Diabase or Dolerite

Pink Garnet (likely Almandine or Rhodolite)

Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Blue Calcite

Calcium Carbonate (CaCO3)

Fluorite

Fluoride (Calcium Fluoride - CaF2)

Pyrite

Iron Sulfide (FeS2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Milky Quartz (Water-worn pebble/nodule)

Quartz (Silicon Dioxide - SiO2)

Garnet Schist or Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Ironstone Concretion (Siderite Nodules)

Siderite (FeCO3) in Mudstone or Sandstone matrix

Milky Quartz

Silicon Dioxide (SiO2)

Moqui Marble

Ironstone Concretion (Goethite/Hematite shell with Sandstone core)

Quartz Mineral

Silicon Dioxide (SiO2)

Potassium Feldspar and Quartz

KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)

Yellow Ochre / Limonite

Limonite (inter-mixed iron oxides and hydroxides, primarily FeO(OH)·nH2O)

Turquoise

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

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3