Man Made Object (Metal Alloy)

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Granite

Felsic intrusive igneous rock

Bauxite

Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))

Bauxite

Bauxite (mixture including Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))

Rose Quartz

Silicon Dioxide (SiO2)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Pink calcite (likely)

Calcite — calcium carbonate, CaCO₃

Turquoise

Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O

Silver Sheen Obsidian

Volcanic Glass (Amorphous Silicon Dioxide - SiO2 with impurities)

Fursuit (Synthetic Fur Specimen)

Canis anthropomorphus syntheticus

Chert (or Flint)

Chert (cryptocrystalline quartz), SiO2

Native Copper in Basalt

Cu

Optical Calcite

Calcium Carbonate (CaCO3)

Gold and Diamond Jewelry

Native Gold (Au) and Diamond (C)

Diamond

Carbon (C)

Magnetite

Magnetite (Fe3O4)

Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)

Jasper, microcrystalline quartz (SiO₂)

Diamond

Carbon (C)

Rose Quartz

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

Fluorite

Calcium Fluoride (CaF2)

Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Pyrite in Quartz Matrix

Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Rutilated Quartz

SiO2 (Quartz) with TiO2 (Rutile inclusions)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Fluorite

Calcium Fluoride (CaF2)

Vesicular Basalt (River Rock)

Afanitic Vesicular Basalt

Obsidian

Obsidian (Volcanic Glass, SiO2 > 70%)

Granite Boulder

Felsic Intrusive Igneous Rock

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Coal (most likely Bituminous or Anthracite)

Coal (primarily composed of carbon with varying amounts of other elements)

Likely tumbled quartz/chalcedony

Quartz (SiO₂), possibly milky quartz or pale chalcedony

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Chert (Flint)

Chert (SiO2)

Chert / Green Jasper

Silicon Dioxide (SiO2)

Quartz Sand

Silicon Dioxide (SiO2)

Likely black beach pebble

Undetermined; possibly basalt, chert, or dark slate

Green Fluorite

Calcium Fluoride (CaF2)

Hematite (Oolitic or Earthy variety)

Iron(III) oxide (Fe2O3)

Chert (Iron-Stained)

Microcrystalline Quartz (SiO2)