Rock Identifier
Transit Token (RTD Denver) (Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)) — not a rock or mineral (anthropogenic material)
not a rock or mineral (anthropogenic material)

Transit Token (RTD Denver)

Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)

Hardness: 3.5-4 (Mohs); Color: Silvery-grey/metallic; Luster: Metallic; Structure: Man-made disc; Cleavage: None; Specific Gravity: Approx 8.5-8.9

Hardness
3
Color
Silvery-grey/metallic
Luster
Metallic
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Physical properties

Hardness: 3.5-4 (Mohs); Color: Silvery-grey/metallic; Luster: Metallic; Structure: Man-made disc; Cleavage: None; Specific Gravity: Approx 8.5-8.9

Formation & geological history

Manufactured via industrial minting processes (striking dies on metal blanks). These were specifically produced for the Regional Transportation District (RTD) in Denver, Colorado, primarily used from the 1970s through the early 2000s.

Uses & applications

Used as a pre-paid fare currency for public transportation (buses and light rail) in the Denver metropolitan area.

Geological facts

This specific token features the RTD logo. While they are no longer in active circulation for fare payment due to smart cards and mobile apps, they remain common pieces of local transit history.

Field identification & locations

Identified by the 'RTD' letters and the circular shape which is smaller than a US quarter. Found in old jars, coin collections, or occasionally in urban ground surveys in Colorado.

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