Tag Archives: Hardness

The Mohs Scale of Mineral Hardness


The Mohs Scale of Mineral Hardness

The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals, through the ability of a harder material to scratch a softer one and not be scratched by it. While the varying hardness of stones was likely first explored around 300 BCE, German mineralogist Friedrich Mohs devised his scale in 1812. It uses 10 standards ranging from talc, the softest, with a value of 1, to diamond, the hardest, with a value of 10. Where does a fingernail fall on the Mohs scale? More… Discuss

ARTICLE: PYRITE: “FOOL’S GOLD”


Pyrite: “Fool’s Gold”

Widely known in the English-speaking world as “fool’s gold” because it has often been mistaken for the precious metal but is vastly less valuable, pyrite is a gold-colored mineral made of iron and sulfur. Despite its nickname and reputation, it does sometimes contain small amounts of real gold. Pyrite is useful in electronics because of its semiconducting properties, but its chief use is as a source of sulfur in the manufacture of sulfuric acid. What are the hazards of mining pyrite? More…Discuss

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