Antropogenic (Man Made)

Tumbled chalcedony (likely blue-gray agate)

Cryptocrystalline quartz, SiO₂; chalcedony/agate variety

Carved smoky quartz (likely)

Quartz, silicon dioxide (SiO₂), smoky variety

Ruby-in-Fuchsite cabochon/tower

Corundum (ruby, Al₂O₃) in fuchsite-bearing mica schist; commonly with chromite and quartz

Clear quartz crystal pendant

Quartz (silicon dioxide, SiO₂)

Vesicular basalt (likely)

Basalt; chiefly plagioclase, clinopyroxene, and olivine, with possible iron-oxide alteration

Likely basalt

Mafic volcanic rock, chiefly plagioclase and pyroxene, commonly with minor olivine and magnetite

Yellow calcite (rough specimen)

Calcite, CaCO₃

Mother of Pearl (Nacre)

Calcium Carbonate (primarily aragonite, with conchiolin)

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Obsidian

Obsidian (volcanic glass, amorphous silica rich rock)

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Emerald (Rough)

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Iron-stained quartz-rich breccia (probable)

Hydrothermal quartz–iron oxide breccia; mainly SiO₂ quartz with iron oxides/hydroxides (hematite/goethite)

Mounted clear gemstone, likely cubic zirconia

Cubic zirconia (zirconium dioxide, ZrO₂), synthetic; exact stone cannot be confirmed from the image

Quartz geode

Quartz (SiO₂), likely a chalcedony-lined geode with druzy quartz

Iron-stained brecciated quartz vein rock

Quartz-rich hydrothermal breccia; predominantly SiO₂ with iron oxides/hydroxides (hematite, goethite) and likely minor host-rock minerals

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, with minor gray mica/graphite or accessory minerals

Rose Quartz (likely carved)

Rose Quartz (SiO2)

Vesicular basalt (likely weathered lava rock)

Vesicular basalt; primarily plagioclase feldspar, pyroxene, and volcanic glass, with possible iron-oxide alteration

Rose Quartz Carving

Quartum roseum (Variety of Quartz, SiO2)

Stainless Steel Spoon

Iron-Chromium Alloy (Fe + Cr + Ni)

Pumice

Pumice, a highly vesicular volcanic glass, commonly rhyolitic to dacitic in composition

Red Swirl Beads (Likely Resin or Glass, simulating Red Jasper or Agate)

N/A (for the beads as pictured); Red Jasper: SiO2 (Chert variety); Red Agate: SiO2 (Chalcedony variety)

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Mica schist (possibly garnet–mica schist)

Muscovite–biotite schist; chiefly quartz, feldspar, muscovite, and biotite

Goldstone

Not a natural mineral or rock. It is an ornamental glass.

Mica-rich schist

Muscovite–biotite schist, commonly quartz-bearing

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly phyllite; composition dominated by mica and quartz

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Scoria

Scoria (a vesicular basalt or andesite)

Yellow faceted gemstone, likely citrine or yellow sapphire

Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)

Fossilized gastropod (likely nerite or related sea snail)

Gastropoda; shell composed originally of aragonite/calcite, commonly replaced or infilled by calcite

Polished brown chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; iron oxides produce the brown coloration

Chert

Silicon dioxide (SiO2)

Rhodonite

Rhodonite (MnSiO3)

Lazulite

Lazulite (Mg,Fe2+)Al2(PO4)2(OH)2

Granite

Granite

Tumbled sodalite with white calcite veining

Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3

Tumbled serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximately Mg₃Si₂O₅(OH)₄

Chalcedony / milky quartz flake

Microcrystalline quartz (SiO₂), likely chalcedony; possibly a worked quartzite or chert fragment

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Polished white chalcedony or milky quartz pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly with iron-oxide staining or a minor mineral inclusion