Sedimentary And Metamorphic Minerals

White Quartz (Milky Quartz)

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Druzy Geode fragment)

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide with Hematite/Limonite inclusions (SiO2 + Fe2O3)

Limonite (Iron Ore)

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

Limonite (Iron Ore)

Limonite (Iron oxide-hydroxide mixture, FeO(OH)·nH2O)

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Hematite inclusions

Rhodonite

Manganese Inosilicate (MnSiO3), often with Ca, Fe, Mg, Zn

Orange Calcite

Calcium Carbonate (CaCO3)

Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Chalcopyrite

Chalcopyrite (CuFeS2)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Phyllite

Phyllite

Marble (White)

Metamorphosed Limestone (mainly CaCO3)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Quartz Geode (Smoky Quartz)

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (Hydrous ferric oxides), generic formula FeO(OH)·nH2O

Rough Dark Green Sapphire

Corundum (Al2O3)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2) matrix

Muscovite Schist with Quartz

KAl2(AlSi3O10)(OH)2 in Schistose matrix

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Blue Apatite

Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Silicon dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limonite (Iron Ore)

Limonite (̑FeO(OH)·nH₂O)

Chert (specifically Jasper or Flint variant)

Cryptocrystalline Quartz (SiO2)

Limestone with Quartz or Calcite Veining

Calcium Carbonate (CaCO3) matrix with SiO2 or CaCO3 inclusions

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2) with impurities of Hematite or Goethite

Fossilized Crab Carapace (Concretion)

Decapoda (fossil), typically preserved in calcite or siderite concretion

Geode (Unopened)

Silica-rich Concretion (primarily SiO2)

Pyrite

Iron Disulfide (FeS2)

Jade (Nephrite or Jadeite)

Nephrite: Ca2(Mg,Fe)5Si8O22(OH)2 (amphibole mineral); Jadeite: NaAlSi2O6 (pyroxene mineral)

Turquoise (possible Dyed Howlite or Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Turquoise)

Turquoise

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

Turquoise

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

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Limonite with Iron Inclusions

Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)

Chert (often called Flint when dark or found in chalk)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper (Yellow Jasper)

Silicon Dioxide (SiO2) with iron inclusions