Mineral Precipitate (Anthropogenic Context)

Quartz Mineral

Silicon Dioxide (SiO2)

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

Limestone with Chert Nodules

Sedimentary Calcium Carbonate (CaCO3) with Microcrystalline Silica (SiO2) inclusions

Granite

Granite (composed of Quartz, Feldspar, and Mica)

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Mixed Mineral Collection

Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)

Quartz with Mineral Inclusions

Silicon Dioxide (SiO2) with accessory minerals

Quartz Mineral Specimens

Quartz (Silicon Dioxide, SiO2)

Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz Vein in Sedimentary Rock

Silicon Dioxide (SiO2) with host Chert or Limestone

Ruby (Raw Corundum)

Corundum (Al2O3) with Chromium traces

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

Rhodochrosite

Manganese Carbonate (MnCO3)

Gneiss (specifically Banded Gneiss)

Gneiss

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Pyrite

Iron Sulfide (FeS2)

Gold Ore (Lode Gold)

Native Gold (Au) in Matrix

Quartzite (with mineral vein)

Metamorphosed Quartz-rich Sandstone (SiO2)

Devil's Toenail (Fossil Oyster)

Gryphaea arcuata (Calcium Carbonate, CaCO3)

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Limonite Stained Basalt

Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Fluorite

Calcium fluoride (CaF2)

Diorite

Diorite (Intermediate intrusive igneous rock)

Sandstone

Arenite (composed primarily of SiO2)

Fluorite (Rainbow, Purple-Blue Tumbled)

Calcium Fluoride (CaF2)

Granite (Light-colored quartz/feldspar variety)

Granite (composed primarily of Quartz SiO2 and Feldspar KAlSi3O8)

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Granite Cobble

Granite

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH) (Calcium phosphate with Fluorine, Chlorine, or Hydroxyl)

Limonite (Ironstone)

Limonite (FeO(OH)·nH2O)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Granite

Granite (Felsic Plutonic Rock)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Peacock Ore (Chalcopyrite/Bornite)

Bornite (Cu5FeS4) or iridescent treated Chalcopyrite (CuFeS2)

Schist

Schist (various compositions)

Quartz Mineral

Silicon dioxide (SiO2)

Granite

Granite (Mainly Quartz SiO2 and Feldspar KAlSi3O8)

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)