Rock Identifier
ABS Plastic (Acrylonitrile Butadiene Styrene) ((C8H8)x·(C4H6)y·(C3H3N)z) — Synthetic Polymer (Synthetic Material)
Synthetic Polymer (Synthetic Material)

ABS Plastic (Acrylonitrile Butadiene Styrene)

(C8H8)x·(C4H6)y·(C3H3N)z

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
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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.

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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

Man-made Synthetic Material (Plastic/Composite)

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

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Bouncy Ball (Synthetic Rubber Polymer) (Polybutadiene / Ethylene Vinyl Acetate (EVA)) — Synthetic material (Not a rock or mineral)

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

Plastic Building Toy (Lego-style piece)

Acrylonitrile Butadiene Styrene (ABS)

not a rock/mineral
Note: Item is not a geological specimen (Polyester mesh and Ethylene-vinyl acetate (EVA) polymer) — Synthetic / Anthropogenic Material

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Synthetic / Anthropogenic Material
Man-made Synthetic Material (Not a rock or mineral) (Polyester (Polyethylene terephthalate) / Faux Fur) — Synthetic / Textile

Man-made Synthetic Material (Not a rock or mineral)

Polyester (Polyethylene terephthalate) / Faux Fur

Synthetic / Textile