Mineral, Jewelry

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Likely metallic mineral specimen

Probably galena (lead sulfide, PbS), though visual identification is uncertain

Pyrite

Iron Sulfide (FeS2)

Carnelian Agate

Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Diamond

Carbon (C)

Moss Agate

Chalcedony (SiO2 with inclusions)

Milky Quartz with Tourmaline and Iron Oxides

Silicon Dioxide (SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Carnelian (Tumbled)

Carnelian (Chalcedony / Silicon Dioxide, SiO2)

Agate (or Quartz with Agate banding)

Silicon dioxide (SiO2)

Gemstones (Emerald and Yellow Topaz or Citrine)

Beryl (Be3Al2Si6O18) and Quartz (SiO2) or Topaz (Al2SiO4(F,OH)2)

Turquoise

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

Turquoise

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

Turquoise

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

Tiger's Eye

Silicon Dioxide (Quartz pseudomorph after crocidolite) - SiO2

Garnet

Pyrope or Almandine (X3Y2(SiO4)3)

Eudialyte

Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2

Moonstone

Orthoclase (Potassium Feldspar) - (K,Na)AlSi3O8

Granite

Granite (a common term for a felsic intrusive igneous rock)

Garnet in Matrix (likely Almandine in Quartz/Mica Schist)

Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock

Polished black mineral or volcanic glass fragment

Indeterminate; possibly obsidian or black tourmaline

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Satin Spar (Gypsum)

Hydrous calcium sulfate (CaSO4·2H2O)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Quartz (Drusy/Crystalline)

Silicon Dioxide (SiO2)

Prehnite

Prehnite (Ca2Al2Si3O10(OH)2)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Dragon Blood Jasper

Epidote with Pietersite or Red Jasper (Ca2Al2Fe3+[Si2O7][SiO4]O(OH))

Carnelian (a variety of Chalcedony)

SiO2 (Silicon Dioxide) primarily colored by iron oxide (Hematite)

Pyrite

Iron Sulfide (FeS2)

Malachite

Copper carbonate hydroxide, Cu2CO3(OH)2

Pyrite (Fool's Gold) in Matrix

Iron Disulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende, chlorite, or manganese/iron oxides

Ruby / Red Tourmaline

Corundum (Al2O3) or Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)4)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Hematite

Iron(III) oxide (Fe2O3)

Chrysocolla

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

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Carnelian

Carnelian (Cryptocrystalline Quartz, SiO2)