Mineral, Metal (Element)

Gold-bearing Quartz Ore

Auriferous Quartz (SiO2 with Au)

One Pound Coin (UK)

Nickel-Brass Alloy (Cu-Zn-Ni)

Granite

Felsic intrusive igneous rock

Beryl (likely Emerald or Aquamarine in matrix)

Beryllium aluminum silicate (Be3Al2Si6O18)

Beryl (Aquamarine)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite and Porphyry Pebbles

Intrusive Igneous Rock

Fluorite Bracelet

Calcium Fluoride (CaF2)

Native Copper (Penny specimen)

Native Copper (Cu)

Limonite and Goethite

Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))

Sandstone (Whetstone/Sharpening Stone)

Siliciclastic Sandstone (SiO2 dominant)

Vanadinite

Pb5(VO4)3Cl

Quartz Pebble

Silicon Dioxide (SiO2)

Small metallic meteorite fragment (probable stony-iron or iron meteorite)

Unclassified meteoritic material; exact classification requires chemical and petrographic testing

Granite

Intrusive Igneous Rock

Native Copper Nugget

Native Copper (Cu)

Polished banded agate (likely blue lace agate)

Chalcedony, microcrystalline SiO₂, with iron and other trace-element impurities

Red garnet cabochon-style earrings

Likely almandine garnet (Fe₃Al₂(SiO₄)₃); the image alone cannot confirm the stone or whether it is natural or synthetic.

Sunstone

Andesine-Labradorite Feldspar ((Ca,Na)(Al,Si)4O8)

Granite

Intrusive Igneous Rock

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Intrusive Igneous Rock

Weathered breccia or hydrothermal vein rock

Silicified polymict breccia, likely quartz–iron-oxide breccia

Lepidolite in Mica Schist

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

Quartz Vein in Matrix (Gneiss/Schist)

Silicon Dioxide (SiO2) in Metamorphic Rock Matrix

Serpentinite

Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Porphyritic Basalt or Porphyritic Andesite

Porphyritic Extrusive Igneous Rock

Quartz–calcite sulfide-bearing mineral specimen

Quartz (SiO₂) with likely calcite (CaCO₃) and iron sulfides, possibly pyrite (FeS₂); exact species requires testing

Native gold nuggets

Gold (Au), usually with minor silver and copper

Milky Quartz

Silicon Dioxide (SiO2)

Dyed Aura Quartz

Silicon Dioxide (SiO2) with metallic coating

Jasper

Silicon dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Mica-rich metamorphic rock, likely schist

Quartz–mica schist; commonly quartz with muscovite and/or biotite mica

Quartz vein in metamorphic rock

Crystalline Silicon Dioxide (SiO2) in Host Rock

Granite Pebble with Quartz Vein

Granite (Plutonic Igneous Rock) with Quartz (SiO2)

Lepidolite with Quartz

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

Bismuth

Bismuth (element Bi) with oxidized thin-film interference layer

Diamond-set letter “L” jewelry piece

Diamond (crystalline carbon, C) set in a metal mount; the metal is not identifiable from the image