Mineral (Man Modified)

Gold Nugget

Native Gold (Au)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Limonite with Trace Fossils

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Greenstone

Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote

Polished septarian nodule

Calcite–aragonite–barite septarian concretion, commonly in a claystone or limestone matrix

Weathered brown rock fragment

Indeterminate; possibly ferruginous sandstone or weathered volcanic rock

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2

Polished Picasso jasper

Silicified carbonate rock, commonly marketed as Picasso jasper; composition varies and is not a single mineral species

Kambaba Jasper

Stromatolite / Fossilized Algae (Rhyolitic structure)

Agate

Agate (Silicon Dioxide, SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Unakite

Unakite (epidote-bearing altered granite; mainly pink potassium feldspar, green epidote, and quartz)

Granite

Granite (a common rock type, not a single mineral; composed primarily of Quartz, Feldspar (Orthoclase and Plagioclase), and Mica (Biotite and/or Muscovite) and/or Amphibole)

Obsidian

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

Quartz

Silicon Dioxide (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2

Fluorite

Calcium Fluoride (CaF2)

Green Fluorite

Calcium Fluoride (CaF2)

Fluorite (Durango Fluorite)

Calcium Fluoride (CaF2)

Gold Nugget

Native Gold (Au)

Tumbled quartz (likely milky quartz)

Quartz — silicon dioxide (SiO₂)

Greenstone, likely serpentinite

Serpentinite; predominantly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), possibly with chlorite, talc, magnetite, or antigorite

Limonite or Goethite (Ironstone)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Clear Quartz Geode

Crystalline Silicon Dioxide (SiO2)

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Likely tumbled quartz/chalcedony

Quartz (SiO₂), possibly milky quartz or pale chalcedony

Quartz geode (likely amethyst-bearing geode)

Microcrystalline quartz and drusy quartz; SiO₂, with possible iron-stained or amethyst quartz

Fluorite

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Fluorite (Green Fluorite)

Calcium Fluoride (CaF2)

Specular Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Polished greenstone (likely serpentine or nephrite-like material)

Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (actinolite–tremolite amphibole)

Likely petrified wood or silicified fossil fragment

Silicified wood; predominantly microcrystalline quartz (SiO₂)

Weathered sandstone

Quartz-rich clastic sandstone, commonly arkosic or feldspathic

Greenstone (Metabalt)

Chlorite-actinolite schist (Greenstone)

Milky Quartz

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Tumbled gray-green metamorphic rock, likely serpentinite or chlorite schist

Serpentinite/chlorite-rich ultramafic metamorphic rock; commonly dominated by antigorite, lizardite, or chlorite with minor magnetite and talc

Polished greenstone (likely serpentinite)

Serpentinite, chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄, possibly with magnetite