Man Made Material (Simulated Mineral)

Sandstone with Iron Staining

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Polished green moss agate cabochon

Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals

Yellow Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)

Amber

Succinite (fossilized resin, C10H16O)

Sandstone

Clastic sedimentary rock (Quartz arenite / Arkose)

Sandstone

Arenite (SiO2 principal)

Tumbled chalcedony (likely milky quartz)

Chalcedony, cryptocrystalline SiO₂; possibly quartz-rich chert

Red Sandstone

Arenite (Ferruginous Sandstone)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Polished black stone egg, probably black obsidian

Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements

Tumbled green-and-white stone, likely serpentine

Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite or talc

Blue chalcedony (likely dyed or polished)

Chalcedony, microcrystalline quartz (SiO₂)

Chalcedony (gray-white agate)

Microcrystalline quartz, SiO₂

Limonite Concretion (Goonie or Rattlestone)

Limonite (FeO(OH)·nH2O)

Vesicular basalt (likely amygdaloidal basalt)

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, clinopyroxene, and commonly olivine; vesicles are partly mineral-filled amygdules.

Rhodonite

Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix

Schist

Mica Schist

Polished brown mineral fragment, likely quartz-rich iron-stained material

Possibly quartz (SiO₂) with iron-oxide inclusions; exact identification is uncertain from the image

Travertine

Calcium Carbonate (CaCO3)

Polished pink feldspar or quartz pebble (uncertain)

Likely microcline feldspar (KAlSi₃O₈) or quartz (SiO₂), with iron-oxide inclusions

Milky Quartz / Chalcedony

Silicon Dioxide (SiO2)

Orange Calcite (Iron-Stained)

Calcium Carbonate (CaCO3)

Epidotite (Unakite-related Epidote)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Ocean Jasper

Orbicular Jasper (Silicon Dioxide with impurities), SiO2

Ocean Jasper

Orbicular Jasper / Chalcedony (SiO2)

Red Sandstone

Arenite (with iron oxide cement)

Fossilized wood fragment

Petrified wood; commonly silicified fossil wood (SiO₂ replacing organic tissue)

Conical fossil shell or shell fragment

Likely a gastropod shell fragment; exact taxon indeterminate from the image

Geode fragment, likely quartz-lined basalt or chalcedony nodule

Microcrystalline quartz (SiO₂), possibly with iron-oxide staining in a basaltic host

Vesicular quartz-rich rock, possibly weathered rhyolite or hydrothermal quartz

Likely quartz (SiO₂) with altered feldspar, iron oxides, and cavities; exact identification requires testing

Tumbled blue-gray stone beads, likely labradorite or dyed quartz

Probable labradorite (plagioclase feldspar; approximately NaAlSi₃O₈–CaAl₂Si₂O₈), though exact identification requires testing

Pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂)

Botryoidal iron-rich jasper

Ferruginous jasper/chalcedony, primarily microcrystalline quartz (SiO₂) with iron oxides and hydroxides

Pink-and-white quartz-rich rock, likely rose quartz matrix

Quartz (SiO₂), possibly intergrown with feldspar or chalcedony

Tumbled white quartz or quartzite pebble

Quartz (SiO₂), possibly massive quartzite

Rose Gold (Copper-Gold Alloy)

Aurum-Cuprum Alloy (Au-Cu)

Sandstone (Pebble)

Arenite (SiO2 based)

Schist

Mica schist, likely muscovite–biotite schist with quartz and feldspar

Diamond (or Diamond Simulant like Cubic Zirconia)

Carbon (C) - if Diamond; Zirconium dioxide (ZrO2) - if Cubic Zirconia

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)