Platinum
Native platinum (Pt)
A dense, durable, silvery-white precious metal that resists corrosion, used in fine jewelry and catalytic converters.
- Mohs hardness
- 4-4.5
- Color
- Silvery white to steel gray
- Type
- mineral
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Overview
Platinum is a native metallic element (chemical symbol Pt), a dense, silvery-white precious metal valued for its rarity, durability, and resistance to tarnish and corrosion. In nature it usually occurs as small grains, flakes, or nuggets, often alloyed with other platinum-group metals and iron.
Platinum is heavier than gold, chemically inert, and highly resistant to heat and chemical attack. Unlike silver, it does not tarnish, keeping its bright white color indefinitely.
These qualities make platinum highly desirable for fine jewelry and essential in many industrial and chemical applications, particularly as a catalyst.
Formation & geology
Platinum forms primarily in mafic and ultramafic igneous rocks, where it crystallizes from cooling magma rich in platinum-group elements. The most famous source is the Bushveld Complex in South Africa, a vast layered intrusion.
When platinum-bearing rocks weather and erode, the dense metal concentrates in placer deposits in rivers and gravels, historically an important source, as in Russia's Ural Mountains and Colombia.
Platinum is also recovered as a byproduct of nickel and copper sulfide mining. Major producers include South Africa, Russia, Zimbabwe, and Canada.
How to identify it
Platinum is identified by its silvery-white to steel-gray metallic color, very high density (notably heavier than silver or steel), and its failure to tarnish or corrode. Its streak is silvery-white to gray.
It is harder than gold and silver (hardness 4-4.5) yet still malleable. Distinguish it from silver (softer, tarnishes dark) and from white metals like steel (platinum is far denser and chemically inert). Native platinum often occurs as small heavy grains rather than large masses.
Its extreme density, resistance to acids, and non-tarnishing brightness are the most reliable identifiers; formal testing confirms purity.
Uses & significance
Platinum is prized in fine jewelry for its durable, non-tarnishing white luster, often used for engagement rings and high-end settings. It is also a recognized investment metal.
Industrially, platinum is vital as a catalyst, most notably in automotive catalytic converters that reduce harmful emissions, and in chemical and petroleum refining. It is also used in electronics, laboratory equipment, medical devices, and dentistry.
Its rarity, far greater than gold, combined with its broad industrial demand makes platinum a strategically and economically important metal.
Frequently asked questions
Is platinum rarer than gold?
Yes, platinum is considerably rarer than gold, with far less mined each year, though prices fluctuate with industrial demand.
Does platinum tarnish?
No. Platinum is chemically inert and resistant to corrosion, so it keeps its bright white color without tarnishing.
How is platinum different from white gold?
Platinum is a naturally white, dense pure metal, while white gold is gold alloyed with other metals and usually plated with rhodium to look white.
What is platinum used for besides jewelry?
It is widely used as a catalyst in catalytic converters and chemical refining, plus electronics, laboratory equipment, and medical applications.
Platinum guides
In-depth guides for identifying, valuing, and understanding Platinum.
