Synthetic Polymer (Synthetic Material)

ABS Plastic (Acrylonitrile Butadiene Styrene)

(C8H8)x·(C4H6)y·(C3H3N)z

AI-generated identification · may be incorrect

Hardness: 1-2 (Mohs); Color: Multi-colored (pigmented); Luster: Glossy/Vitreous; Structure: Amorphous polymer; Specific Gravity: 1.04-1.12

Hardness: 1-2 (Mohs)
Color: Multi-colored (pigmented)
Luster: Glossy/Vitreous

Identified March 9, 2026More synthetic polymer (synthetic material) →

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Physical properties

Hardness: 1-2 (Mohs); Color: Multi-colored (pigmented); Luster: Glossy/Vitreous; Structure: Amorphous polymer; Specific Gravity: 1.04-1.12

Formation & geological history

Man-made through the polymerization of styrene and acrylonitrile in the presence of polybutadiene. Developed in the mid-20th century (Modern era).

Uses & applications

Used in the manufacturing of modular interlocking building bricks, toys, automotive components, and protective headgear.

Geological facts

While not a natural rock, it is highly durable and chemically stable. LEGO bricks have such high manufacturing precision that bricks from 1958 still fit with bricks made today.

Field identification & locations

Identify by 'LEGO' embossed on studs, interlocking tubes/pins on the underside, and distinct clicking sound. Found in households globally.

Other synthetic polymer (synthetic material) specimens

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Man-made Synthetic Material (Costume Faux Fur)

Synthetic Polymer (Polyester/Acrylic)

not a rock

Man-made Synthetic Material (Plastic/Composite)

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

Non-geological / Synthetic

Faceted Gemstone

Unknown transparent mineral, possibly Diamond (C), Cubic Zirconia (ZrO2), Quartz (SiO2), or Glass

gemstone

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

gemstone

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

Synthetic material (Not a rock or mineral)

Plastic Building Toy (Lego-style piece)

Acrylonitrile Butadiene Styrene (ABS)

not a rock/mineral