Industrial Byproduct (Anthropogenic Material)

Planet Earth

Gaia (Silicate Terrestrial Planet)

Uncertain fine-grained rock or mineral-bearing specimen

Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains

Iron-stained quartz or quartzite fragment

Quartz (SiO₂), possibly iron-oxide-stained quartzite

Diamond

Carbon (C)

Iron-rich concretion or slag-like rock

Goethite–hematite limonite concretion, possibly iron slag

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Black glassy fragment, likely obsidian or industrial glass

Volcanic glass (obsidian), chiefly amorphous SiO₂; identification uncertain from image

Small pale stone fragment (undetermined)

Unidentified; the image lacks diagnostic detail for a reliable identification

Tumbled blue-gray pebble, likely blue aventurine or quartzite

Quartz-rich rock; exact identification is uncertain from appearance alone

Polished blue banded stone, likely sodalite or blue apatite

Probable sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue apatite, Ca₅(PO₄)₃(F,Cl,OH)

Iron-stained quartz-bearing rock fragment

Likely quartz with iron-oxide staining; exact rock type cannot be determined from the image

Limestone

Calcium Carbonate (CaCO3)

Common opal (rough opalized material)

Hydrated amorphous silica, SiO₂·nH₂O; likely common opal with dark mineral inclusions

Small weathered fossil or mineral fragment

Indeterminate; possibly fossilized shell, bone, or a pale carbonate mineral

Clear quartz crystal beads

Quartz (silicon dioxide, SiO₂)

Blue gemstone, likely tumbled sapphire or blue spinel

Corundum (Al₂O₃) if sapphire; alternatively spinel (MgAl₂O₄)

Iron-rich meteorite candidate

Unclassified meteoritic iron–stone material; possible stony-iron meteorite or terrestrial ironstone

Likely rough rose quartz

Quartz, silicon dioxide (SiO₂), with pink coloration

Quartzite

Quartzite (SiO2)

Vesicular volcanic rock, likely scoria

Scoria (vesicular basaltic to andesitic volcanic rock)

Iron meteorite fragment

Fe-Ni meteorite, likely an iron meteorite or stony-iron fragment

Small rounded pebble, likely quartz-rich stone

Unidentifiable from the image; possibly quartzite or quartz-bearing river pebble

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Opalite

Man-made Glass (SiO2 + additives)

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Quartz-rich pegmatitic rock with possible epidote or chlorite

Hydrothermal/pegmatitic quartz-bearing rock; identifiable minerals may include quartz (SiO₂), feldspar, and epidote/chlorite

Tumbled kiwi jasper (often sold as sesame jasper)

Trade name for a green, quartz-rich rock, commonly a mixture of quartz/chalcedony and dark mineral inclusions; not a single defined mineral species

Polished orbicular jasper (likely ocean jasper)

Orbicular jasper; chiefly microcrystalline quartz and chalcedony (SiO₂), with assorted mineral inclusions

Likely bituminous coal or carbon-rich shale fragment

Bituminous coal; predominantly carbon with macerals and minor clay/pyrite

Tumbled K2 stone (granite with blue azurite)

K2 granite, chiefly quartz–alkali feldspar–biotite with azurite inclusions

Diamond

Natural Diamond (Carbon, C)

Granite

Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Quartzite

Quartzite (SiO2)

Rose quartz

Quartz, silicon dioxide (SiO₂)

Diamond (Cut Gemstone)

Carbon (C)

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly a fragment of quartzite or silica-rich slag

Diamond

Carbon (C)

Orange calcite

Calcite (CaCO₃), likely honey/orange calcite

Polished dark stone, likely basalt or fine-grained mafic rock

Basalt (approximately; commonly plagioclase, pyroxene, and minor olivine/magnetite)

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide-rich inclusions

Diamond (Set in Jewelry)

Carbon (C)

Polished banded jasper (likely red-and-gray jasper)

Microcrystalline quartz (SiO₂), commonly termed jasper; exact variety cannot be confirmed from the photo