Metal (Elemental Mineral)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 inclusions)

Slag

Metallurgical Slag

Celestite (Celestine)

Strontium sulfate (SrSO4)

Likely weathered basalt with iron-oxide alteration

Basalt (fine-grained mafic volcanic rock), chiefly plagioclase and pyroxene with altered iron-bearing minerals

Milky or Iron-Stained Quartz

Quartz (Silicon Dioxide, SiO2)

Rose Quartz

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

Milky Quartz

Silicon Dioxide (SiO2)

Turquoise-and-coral silver jewelry brooch

Turquoise: hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; red cabochons appear to be coral, likely set in silver

Green Aura Quartz

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Coating

Opalite (Man-made Glass)

Fused glass (typically made of dolomite and metal opacifiers)

Likely quartz-rich igneous pebble

Uncertain; possibly granite or quartz-bearing pegmatite

Gold-bearing Quartz Vein in Mafic Rock

Hydrothermal Quartz Vein within Greenschist/Amphibolite facies (SiO2 with Au)

Lepidolite

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

Gold Flakes

Native Gold (Au)

Granite Boulder

Felsic Intrusive Igneous Rock

Blue-green agate bead bracelet

Chalcedony (microcrystalline quartz, SiO₂), likely dyed blue-green

Quartz crystal pendant

Quartz (silicon dioxide, SiO₂), likely rock crystal or milky quartz

Mixed gemstone jewelry collection

Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline

Zircon

Zircon (Zirconium Silicate, ZrSiO4)

Olivine (Peridot)

Magnesium Iron Silicate ((Mg, Fe)2SiO4)

Iron-rich sandstone (Gozan/Ironstone)

Ferruginous Sandstone (clastic sedimentary rock)

Metallic sulfide ore, possibly pyrite-rich

Pyrite (FeS₂), potentially mixed with chalcopyrite, galena, or iron oxides

Granite

Felsic intrusive igneous rock

Diamond jewelry pendant or cluster

Diamond, crystalline carbon (C), likely mounted in metal

Granite / Pegmatite with Quartz Vein

Granite (composed mainly of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)

Lepidolite on Quartz

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite) / SiO2 (Quartz)

Blue Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Olivine (Peridot Stone)

(Mg, Fe)2SiO4 (Magnesium Iron Silicate)

Milky Quartz

Silicon Dioxide (SiO2)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Sandstone

Arenite (SiO2 primarily)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (Intrusive Igneous Rock)

Pink Lepidolite

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

Granite

Intrusive Igneous Rock

Quartz–feldspar pegmatite fragment

Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with possible mica/amphibole

Faceted quartz crystal sphere (likely rock crystal)

Quartz, silicon dioxide (SiO₂)

Galena-rich sulfide specimen

Galena (lead sulfide, PbS), possibly with sphalerite or other sulfides

Native silver (likely)

Silver, Ag; possibly silver-bearing sulfide or mica contamination

Iron Gossan (Limonite/Goethite)

Hydrated Iron Oxides (FeO(OH)·nH2O) from oxidation zones

Pallasite Meteorite (likely Imilac or Brenham)

Stony-Iron Meteorite (Pallasite)