Pink Anthracite Coal (dyed)

Hardness: 2.5-3.0 (Mohs). Color: Naturally black with a submetallic to metallic luster. The specimen shown has been artificially colored pink/purple. Luster: Vitreous to submetallic. Crystal Structure: Amorphous (non-crystalline). Cleavage: None, generally conchoidal fracture. Specific Gravity: 1.3-1.8.

Original anthracite coal forms from the compression and heating of plant matter (peat) over millions of years, typically in ancient swamps and bogs. This specific pink coloration is not natural to anthracite and is the result of artificial dyeing or painting, likely for decorative purposes. The original coal would be Late Carboniferous to Permian in age (around 300-250 million years old).

Naturally, anthracite coal is primarily used as a high-quality, clean-burning fuel due to its high carbon content. It is also used in water filtration, as an abrasive, and in electrodes. When artificially colored, its purpose shifts entirely to decorative uses, such as landscaping, crafts, or educational display.

Anthracite is the highest rank of coal, containing 92-98% carbon. It burns cleaner and hotter than other coal types. The pink coloration seen in the image is not a natural geological occurrence. While some minerals can exhibit pink hues (e.g., rhodochrosite, pink quartz, tourmaline), this particular specimen, with its dull to slightly submetallic luster and rock-like texture (rather than crystalline), strongly suggests an artificially colored coal due to the overall appearance and unusual color for a natural rock of this texture.

To identify natural anthracite in the field, look for a jet-black color, a submetallic to metallic luster, and a relatively light weight for its size. It often breaks with a conchoidal fracture. It will not scratch easily with a knife but can be relatively brittle. The key identifier in this photo suggesting altered coal is the bright, uniform, and unnatural pink/purple color, which is not characteristic of any common natural mineral or rock that would look like this. If it were a naturally colored mineral, it would likely exhibit crystalline forms or a different luster and hardness. A simple scratch test (a streak test would reveal a black streak) or chemical analysis would confirm it is not a natural pink mineral but rather dyed coal. Common locations for natural anthracite include Pennsylvania (USA), Wales, and parts of China.