fools gold,

🗣 SL提问: fools gold

✍️ Ai批改: Fool's gold is a common nickname for iron pyrite, a mineral with the chemical formula FeS₂ (iron disulfide)、It earned this name because its metallic luster and pale brass-yellow color often resemble real gold, tricking inexperienced prospectors into thinking they’ve found gold.

Key Differences Between Pyrite and Gold:
1、Color & Shine:
Pyrite: Brassy yellow, often with a greenish or grayish tint; more reflective、
Gold: Warmer, richer yellow with a softer luster (does not sparkle as much)、

2、Hardness:
Pyrite is harder (6–6.5 on the Mohs scale) and brittle、
Gold is soft (2.5–3 on Mohs) and malleable (can be dented with a fingernail or knife)、

3、Streak Test:
Pyrite leaves a greenish-black or brownish streak when rubbed on unglazed porcelain、
Gold leaves a golden-yellow streak、

4、Density:
Gold is much denser (19.3 g/cm³) and feels heavier for its size、
Pyrite is lighter (4.8–5 g/cm³)、

5、Crystal Structure:
Pyrite often forms cubic or octahedral crystals、
Gold typically appears as nuggets or flakes、

Why Does Pyrite Form?
Pyrite commonly occurs in sedimentary rocks, hydrothermal veins, and metamorphic environments、It forms in low-oxygen conditions where sulfur reacts with iron、

Fun Fact:
Pyrite was once used to spark early firearms (like flintlock guns) because it produces sparks when struck against steel、

Is Fool’s Gold Worth Anything?
While not valuable like gold, pyrite is sometimes sold as a collector’s mineral or used in jewelry (though it can tarnish over time)、It’s also a source of sulfur in industrial processes、

Pro Tip: If you’re unsure whether you’ve found gold, try the streak test or consult a geologist!