Mineral (Processed Metal)

Granite

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Bismuth crystal

Bismuth (Bi), commonly laboratory-grown

Granite

Phaneritic Felsic Intrusive Igneous Rock

Popcorn

Zea mays everta (P. Wilson) (Botanical name for the corn variety)

Bauxite

Bauxite (Al2O3·2H2O)

Native metal specimen, likely galena or metallic slag

Probably galena (lead sulfide, PbS); identification is uncertain from the image alone

Quartz Vein in Host Rock

Hydrothermal Quartz (SiO2) in Slates/Schists

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Granite

Granite (Intrusive Igneous Rock)

Gossan (Iron Hat)

Limonitic Gossan (predominantly FeO(OH)·nH2O)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Gossan / Iron Ore Rock

Hematite / Goethite / Limonite iron oxide assemblage

Rose Quartz

Silicon Dioxide (SiO2) with trace impurities of Titanium, Manganese, or Iron

Granite

Intrusive Igneous Rock (Felsic)

Quartz cabochon turtle pendant

Quartz (SiO₂), likely a translucent variety with natural inclusions

Yellow calcite cabochon

Calcite (calcium carbonate, CaCO₃), likely honey/yellow calcite

Polished amethyst-bearing quartz

Quartz, SiO₂; purple coloration from trace iron and irradiation, likely in an amethyst/quartz matrix

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Native Gold Flake

Gold (Au)

Banded sandstone pebble

Lithic or quartz-rich sandstone; exact composition requires testing

Quartz-rich hydrothermal ore rock, likely gold-bearing quartz vein

Milky quartz (SiO₂) with iron-oxide staining and probable sulfide minerals; host rock may be schist or altered granite

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2) with iron oxide inclusions

Tiger's Eye

Silicified Crocidolite Pseudomorph (SiO2 with iron oxides)

Quartzite

Quartzite (primarily SiO2)

Granite

Intrusive Igneous Rock

Milky quartz with possible mica or feldspar inclusions

Quartz (SiO₂), likely with minor inclusions

Red Granite

Phaneritic Felsic Intrusive Igneous Rock

Granite

Granite

Possible iron-rich meteorite or metallic sulfide-bearing rock

Unconfirmed; candidates include stony-iron meteorite, iron meteorite, or pyrite-bearing terrestrial rock

Lepidolite in Quartz (Lithium-bearing Ore)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Possible weathered metallic mineral specimen

Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

Earthy iron-rich clay or weathered laterite

Hydrated iron oxides and clay minerals, commonly goethite/hematite with kaolinite or illite

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Chalcopyrite-bearing Ore

Chalcopyrite (CuFeS2)

Beryl (Variety: Aquamarine)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Beryl (var. Heliodor or Aquamarine)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Celestine (Celestite)

Strontium sulfate (SrSO4)

Granite

Granite (felsic intrusive igneous rock)