Man Made Object (Metalwork)

Moonstone

Orthoclase Feldspar (formula: (K,Na)AlSi3O8)

Chert

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Diamond (as set in a metal alloy ring)

Diamond (Pure Carbon, C)

Grey Granite

Phaneritic Felsic Intrusive Igneous Rock

Pearl (Biogenic)

Nacre / Calcium Carbonate (CaCO3)

Obsidian

Volcanic Glass (Amorphous SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Fossilized Shark Tooth

Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

Pyrite

Iron Sulfide (FeS2)

Sunstone

Aventurine Feldspar (Plagioclase Feldspar with inclusions)

Diamond

Carbon (C)

Calcite

Calcium Carbonate (CaCO3)

Polished orbicular jasper (likely ocean jasper)

Jasper, microcrystalline quartz (SiO₂), colored by iron oxides and other inclusions

Polished brecciated jasper

Jasper (microcrystalline quartz, SiO₂), likely brecciated and iron-stained

Polished Picasso jasper

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

Polished leopard-skin jasper

Jasper, a microcrystalline quartz variety (SiO₂), with iron-oxide and other mineral impurities

Tumbled turquoise

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Red jasper (tumbled)

Jasper, microcrystalline quartz/chalcedony (SiO₂) colored mainly by iron oxides

Tumbled carnelian (orange-red chalcedony)

Carnelian, a microcrystalline variety of quartz (SiO₂)

Tumbled unakite

Unakite (epidote + pink K-feldspar + quartz)

Polished brown jasper

Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich variety

Tumbled jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions

Red jasper (likely tumbled)

Jasper, microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides

Polished Ocean Jasper (orbicular jasper)

Siliceous microcrystalline quartz/chalcedony, mainly SiO₂, with iron- and manganese-rich inclusions

Orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony with iron-oxide and feldspar inclusions; commonly marketed as Ocean Jasper

Red cabochon gemstone, likely carnelian

Carnelian: orange-red chalcedony, microcrystalline quartz (SiO₂)

Red jasper (likely rough jasper/chert)

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Polished orbicular jasper (likely ocean jasper)

Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions

Polished/tumbled jasper, likely ocean jasper or brecciated jasper

Jasper: microcrystalline quartz (SiO₂) with iron oxides and other silicate impurities

Tumbled agate (likely Botswana or fortification agate)

Microcrystalline quartz, SiO₂ (chalcedony with banded impurities)

Tumbled turquoise-like stone

Likely turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Agate

Silicon Dioxide (Chalcedony), SiO2

Petoskey Stone

Hexagonaria percarinata (Fossilized rugose coral)

Unakite

Granite (altered hydrothermal)

Tumbled carnelian (likely orange chalcedony)

Carnelian, a cryptocrystalline variety of quartz; SiO₂, commonly colored by iron oxides

Agate

Silicon Dioxide (Chalcedony), SiO2

Rhodonite

Inosilicate (Manganese Iron Magnesium Calcium Silicate, (Mn,Fe,Mg,Ca)SiO3)

Petoskey Stone

Hexagonaria percarinata

Polished banded agate (likely carnelian/onyx variety)

Microcrystalline quartz, SiO₂ (chalcedony with iron-oxide bands)

Polished dendritic jasper or agate slab

Microcrystalline quartz (SiO₂), likely jasper with chalcedony and iron/manganese dendrites