Igneous, Metamorphic, And Sedimentary (Mixed Assemblage)

Lapis Lazuli

Lapis Lazuli (Rock containing lazurite, calcite, and pyrite)

Rough Gemstone Grains (Mixed Sapphires and Quartz)

Corundum (Al2O3) and Quartz (SiO2)

Natural gemstone and mineral collection

Mixed specimens, including turquoise, tiger’s eye, amethyst, fluorite, pyrite, garnet, rose quartz, lapis lazuli, obsidian, rhodonite, red corundum, labradorite, calcite, lepidolite, sodalite, apatite, and others

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Unakite

Epidotized Granite

Beach Pebbles and Jasper

Quartz / Microcrystalline Silicon Dioxide (SiO2)

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)

Pyrite-bearing sulfide ore (likely pyrite with iron oxides)

Pyrite, FeS₂, possibly mixed with limonite/goethite and other sulfides

Unakite

Unakite (Epidotized Granite)

Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation

SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)

Dark mafic rock, likely basalt

Basalt (fine-grained assemblage chiefly plagioclase and pyroxene, commonly with olivine and iron oxides)

Soil with Mineral Detritus and Quartz Fragments

Regolith / Silicate Mineral Aggregate

Sodalite

Na4Al3(SiO4)3Cl (Sodium Aluminum Silicate Chloride)

Unakite

Unakite (Epidotized Granite)

Gneiss

Banded gneiss; typically quartz–feldspar–mica assemblage

Gneiss (probable banded metamorphic rock)

Banded gneiss; typically quartz–feldspar–mica assemblage

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Quartz fragment

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Mica

Mica group (often Muscovite or Biotite)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite)

Feldspar-Quartz Rock (likely Pegmatite or Granite)

Feldspar-Quartz composite rock (KAlSi3O8 - SiO2)

Granite Pebble

Granite (composed of Quartz, Feldspar, and Mica)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Unakite

Epidotized Granite

Unakite

Epidotized Granite

Apatite

Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Blue Apatite

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

Lapis Lazuli

Lapis lazuli (complex rock composed of Lazurite, Calcite, and Pyrite)

Unakite

Unakite (Metasomatized Granodiorite)

Green aventurine / epidote-bearing metamorphic rock

Likely chlorite- and epidote-rich schist or altered amphibolite; exact identification requires testing

Gemstone bead necklace, likely mixed tourmaline and quartz

Probable schorl/dravite tourmaline with quartz or smoky quartz; exact identification requires testing

Quartz with Chlorite / Greenschist

Quartz vein in Greenschist (SiO2 with Chlorite group minerals)

Black tourmaline bead bracelet

Schorl tourmaline, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄

Smoky Quartz and Orthoclase Feldspar

Granitic Pegmatite (SiO2 + KAlSi3O8)

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Asphalt (Bituminous Rock)

Natural bitumen or Bituminous limestone/sandstone

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Caribbean Calcite

Calcite (CaCO3) with Aragonite (CaCO3)