Man Made Object (Metal Alloy)

Native Gold

Gold (Au)

Iron Meteorite

Siderite (Iron-Nickel Alloy)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Tumbled serpentine

Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4

Sandstone

Arenite

Iron-Nickel Meteorite

Siderite (Meteoric Iron-Nickel alloy)

Pyrope Garnet (Bohemian Garnets)

Pyrope (from the group Mg3Al2(SiO4)3)

Actinolite (likely fibrous amphibole)

Actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; possibly an actinolite–tremolite specimen

Coral (Precious Coral)

Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).

Serpentine-rich metamorphic stone

Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile) with possible quartz, magnesite, and magnetite

Jade

There are two distinct minerals commonly known as Jade: Jadeite (NaAlSi2O6) and Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2). Based on the appearance, these spheres are likely Nephrite.

Red Jasper

Red Jasper (variety of Chalcedony, SiO₂)

Tumbled green-brown stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Limestone

Calcareous sedimentary rock (CaCO3)

Iron Meteorite

Siderite (Meteoric Iron-Nickel alloy)

Red Sandstone

Arenite (with Iron Oxide / Hematite staining)

Galena (likely)

Galena, lead sulfide (PbS)

Chert (Nodular Chert)

Microcrystalline Silica (SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Copper Ore (likely Chalcopyrite in Matrix)

Chalcopyrite (CuFeS2)

African Turquoise (Jasper)

Polychrome African Jasper (often marketed as 'African Turquoise' due to its color, but it is not true turquoise)

Green Aventurine

Aventurine (a variety of Quartz, SiO2 with fuchsite inclusions)

Mica-rich schist

Muscovite–biotite schist, commonly quartz-bearing

Hag Stone

Perforated Sedimentary Rock (Typically Limestone or Sandstone)

Dyed Blue Agate Slice

Silicon Dioxide (SiO2)

Raw galena specimen

Galena (lead sulfide, PbS)

Pale green tumbled mineral fragment, likely serpentine or green calcite

Probable serpentine-group mineral (Mg3Si2O5(OH)4) or, less likely, calcite (CaCO3); identification is uncertain from the photograph

Red Jasper or Chert

Jasper (SiO2, a variety of chalcedony with iron oxide impurities), Chert (SiO2)

Granite

Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)

Quartzite Pebble

Quartzite (SiO2)

Quartzite

Quartzite (SiO2 silicon dioxide)

Quartz (River-worn Pebble)

Quartz (SiO2)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Granite

Felsic intrusive igneous rock

Granite

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica)

Fluorite

Calcium Fluoride (CaF2)

Likely galena-bearing ore

Galena (PbS), possibly mixed with quartz or carbonate gangue

Portable Ceramic Space Heater

Polished Acrylonitrile Butadiene Styrene (ABS) Plastic with Ceramic Heating Elements

Onyx Marble (also commonly called Onyx)

Calcite (CaCO3), often with other mineral impurities