Mineral

Amygdaloidal Basalt

Vesicular-Amygdaloidal Basalt (Mafic Extrusive)

Gneiss

Metamorphic Gneiss

Gneiss (with Quartzite and Mica)

Gneiss

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Diorite

Phaneritic plutonic rock (dominated by plagioclase feldspar and hornblende)

Malachite

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

Limonite Concretion

FeO(OH)·nH2O (Hydrated Iron Oxide)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Limonite (Ironstone Concretion)

Limonite: FeO(OH)·nH2O

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Limonite (Ironstone)

Limonite (mixture of hydrated iron(III) oxide-hydroxides)

Limonite (Iron Stone/Gossen)

Limonite (FeO(OH)·nH2O)

Bauxite

Bauxite (Al2O3·2H2O mixed with iron oxides)

Limonite

Limonite (Hydrated iron oxide mixture, FeO(OH)·nH2O)

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated Iron Oxide)

Limonite Concretion (Ironstone)

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

Limonite (vibrant yellowish-brown iron oxide)

Limonite (FeO(OH)·nH2O)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Limonite / Ironstone

Hydrated ferric oxide (FeO(OH)·nH2O)

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Desert Rose

Gypsum (variety Selenite) or Barite: CaSO4 · 2H2O

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

Pyrite

Iron Disulfide (FeS2)

Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)

Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)

Green Fluorite

Calcium Fluoride (CaF2)

Quartz Geode

Silicon dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Greenstone (Amygdaloidal Basalt)

Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)

Moss Agate

Chalcedony (Silicon Dioxide) with Chlorite or Iron/Manganese inclusions (SiO2)

Jadeite and Mixed Gemstones (Ruby, Sapphire, Emerald)

Jadeite (NaAlSi2O6), Corundum (Al2O3), Beryl (Be3Al2(Si6O18))

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Chrysocolla

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Quartzite

Quartzite (Primary mineral: Silicon Dioxide, SiO₂)

Sandstone (with potential mineral inclusions)

Clastic sedimentary rock (primarily Quartz, SiO2)

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Limonite Geode (Ironstone Concretion)

Limonite [FeO(OH)·nH2O] with possible Quartz or Calcite interior