Sedimentary (Secondary Mineral Formation)

Turquoise color-bead and Hematite necklace

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

Green Quartz (including Prase or Aventurine variants)

Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Sandstone (with secondary weathering/concretion)

Arenite (composed primarily of Quartz, SiO2)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Quartz with Calcite / Geode Fragment

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)

Lepidolite

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Jasper

SiO2 (Cryptocrystalline quartz)

Likely hematite-rich iron ore

Hematite (Fe₂O₃), possibly with magnetite and/or goethite

Limonite (Iron Ore)

FeO(OH)·nH2O

Orange Calcite

Calcium Carbonate (CaCO3)

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide with inclusions (SiO2)

Vesicular basalt (likely weathered volcanic rock)

Basalt; primarily plagioclase feldspar, pyroxene, and sometimes olivine

Pink Granite

Granite (Felsic Plutonic Igneous Rock)

Banded Chert / Agate

Silicon Dioxide (SiO2)

Limonite with Quartz

Hydrated Iron Oxide Hydroxide with Silicon Dioxide (FeO(OH)·nH2O + SiO2)

Mineral and Rock Collection (Assorted)

Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Limonite (Ironstone)

Goethite/Limonite (Hydrated iron(III) oxide-hydroxide)

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Malachite

Copper carbonate hydroxide, Cu2CO3(OH)2

Botryoidal goethite/limonite specimen

Goethite (α-FeO(OH)), commonly mixed with limonite and iron oxides

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite

Blue Aragonite

Aragonite (Calcium Carbonate, CaCO3)

Yellow Ochre / Limonite

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Limonite or Goethite (Ironstone)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Kaolinite (China Clay)

Kaolinite (Al2Si2O5(OH)4)

Limonite

FeO(OH)•nH2O

Botryoidal Chalcedony

Chalcedony (SiO2)

Yellow Ocher (Iron-rich Silt/Clay)

Goethite-rich Limonite (FeO(OH)qnH2O)

Iron-rich weathered rock (likely limonite/goethite concretion)

Limonite–goethite mixture; chiefly FeO(OH)·nH₂O

Agate

Silicon Dioxide (SiO2)

Red Jasper

SiO2 (Silicon Dioxide) with Fe2O3 (Hematite)

Limonite (Ironstone)

Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))

Limonite / Goethite (Iron Ore Mineral nodule)

FeO(OH)·nH2O / FeO(OH)

Limonite

FeO(OH)•nH2O

Chrysocolla on Limonite Matrix

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

Manganese Ore (Psilomelane/Pyrolusite)

Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)