Mineral Description (Anthropogenic Material)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Granite Pebble

Granite

Sandstone

Arenite

Fossilized cylindrical shell or bone fragment

Indeterminate biogenic carbonate or phosphatic fossil; possible fragment of a tubular shell (e.g., scaphopod) or hollow bone

Chalcedony (Agate / Quartz Pebble)

Silicon Dioxide (SiO2)

Amber

Succinite (fossilized resin)

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂)

Tumbled white chalcedony (likely milky quartz)

Chalcedony, microcrystalline SiO₂; possibly milky quartz

Rose quartz (probable)

Quartz, SiO₂; pink coloration typically from trace inclusions or irradiation-related defects

Polished brecciated jasper

Silicified breccia, chiefly microcrystalline quartz (SiO₂) with iron-oxide staining

Tumbled yellow-brown translucent stones, likely quartz/chalcedony

Quartz (SiO₂) or microcrystalline quartz (chalcedony); exact identification requires testing

Tumbled quartz pebble

Quartz (SiO₂), likely milky or iron-stained quartz

Polished blue stone, likely sodalite or dyed agate

Sodalite: Na₈(Al₆Si₆O₂₄)Cl₂; exact identification requires testing

Quartz geode (likely amethyst-bearing geode)

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

Milky quartz (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Tumbled chalcedony (likely pale agate or quartz pebble)

Microcrystalline silica, SiO₂ (chalcedony; possibly quartz-rich agate)

Botryoidal chalcedony (possible seam agate)

Microcrystalline quartz, SiO₂; commonly with iron-oxide and clay inclusions

Sodalite

Na4Al3(SiO4)3Cl (Sodium Aluminum Silicate Chloride)

Green Serpentine

Serpentine group (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz River Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Howlite (Dyed Turquoise)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Olivine (Peridot)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Rhodonite

Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3

Milky Quartz with Dendritic Inclusions

Silicon Dioxide (SiO2)

Honey Calcite

Calcium Carbonate (CaCO3)

Olivine (Peridot when gem-quality)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Mica (Muscovite)

Muscovite (KAl2(AlSi3O10)(OH)2)

Honey Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Gold

Native Gold (Au)

Tree Agate

Silicon Dioxide (SiO2) with inclusions of manganese and iron oxides

Quartz River Pebble

Quartz (Silicon Dioxide, SiO2)

Aventurine (Green)

Aventurine Quartz (SiO2 + Fuchsite inclusions)

Quartz Pebble (Water-worn)

Silicon Dioxide (SiO2)

Quartz Fragment

Silicon Dioxide (SiO2)

Brown Agate

Cryptocrystalline Quartz (SiO2)