Man Made Material (Jewelry, Metal Alloy)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Tumbled dark pebble

Indeterminate; likely basalt or fine-grained dark metamorphic rock

Likely vesicular basalt (scoria)

Basaltic volcanic rock, chiefly plagioclase, pyroxene, and possibly olivine

Polymict conglomerate with a projecting pebble

Conglomerate; clast-supported polymict conglomerate, dominated by quartz/feldspar and lithic fragments in a cemented matrix

Tumbled blue-green stone, likely chrysocolla-bearing jasper

Chrysocolla-rich chalcedony/jasper; commonly a mixture of chrysocolla (hydrated copper silicate, variable formula) and quartz (SiO₂)

Quartz geode or drusy quartz cluster

Quartz (silicon dioxide, SiO₂), likely microcrystalline quartz lining a cavity

Tumbled brown stone, likely jasper or iron-stained quartz

Microcrystalline quartz (SiO₂), possibly chalcedony/jasper with iron-oxide inclusions

Weathered sandstone (probable)

Quartz-rich sandstone, largely composed of cemented quartz grains (SiO₂)

Tumbled polymict breccia (probable quartz-rich breccia)

Clastic breccia composed mainly of quartz, feldspar, and iron-oxide-stained rock fragments

Ironstone / limonitic iron ore

Goethite–hematite–limonite aggregate, chiefly FeO(OH) and Fe₂O₃·nH₂O

Weathered granitic rock

Granite, likely biotite granodiorite

Tourmalinated quartz sphere

Quartz (SiO₂) with black schorl tourmaline inclusions

Fossil shell fragment

Likely a fossilized brachiopod or bivalve; exact taxon cannot be determined from the image

Tumbled nephrite jade (likely)

Nephrite jade; fibrous amphibole aggregate, chiefly actinolite–tremolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂

Rounded granitic pebble

Granite, likely biotite granite or granodiorite

Likely botryoidal malachite or chrysocolla specimen

Malachite, Cu₂CO₃(OH)₂; possibly chrysocolla, hydrated copper silicate

Tumbled yellow chalcedony (likely citrine or yellow quartz)

Quartz, SiO₂; potentially microcrystalline chalcedony

Rough Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Amber

Succinite (C10H16O)

Chrysocolla (with Malachite / Copper Ore Matrix)

Chrysocolla (Cu,Al)2H2Si2O5(OH)4·nH2O / Malachite Cu2CO3(OH)2

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Diorite (Dalmatian Stone)

Intermediate Phaneritic Igneous Rock

Rose Quartz

Quartz (Silicon Dioxide, SiO2) with traces of Titanium, Manganese, or Iron

Green Aventurine

Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Labradorite

Labradorite (Plagioclase Feldspar), (Ca,Na)(Al,Si)4O8

Chert (Flint/Jasper variety)

Silicon Dioxide (SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Garnetiferous Pegmatite

Pegmatite with Almandine Garnet and Muscovite

Diorite (Spotted or Dalmatian Stone pattern)

Diorite

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Olivine (in Peridotite/Dunite form)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Graphic Granite

Pegmatitic Granite (Quartz and Microcline K-Feldspar mixture)

Chert (Flint/Jasper variety)

Silicon Dioxide (SiO2)

Chert (Jasper influence)

Microcrystalline Quartz (SiO2)

Black Limestone with Calcite Veining

Limestone (CaCO3) with Calcite (CaCO3) inclusions

Precious Opal

Hydrated Silica (SiO2·nH2O)

Chert (Nodule)

Microcrystalline Quartz (SiO2)