Pegmatite

Main Elements:

Si, Al, K, Na, Li, O

Chemical Composition:

Similar to granite but enriched in rare elements like lithium, beryllium, and rare earth elements

Density:

2.6 – 2.8 g/cm³

Compressive Strength:

Variable

Melting Point:

650 – 800°C

Formation:

Forms in the final stages of magma cooling, allowing crystals to grow extremely large. Often found in dikes and veins.

Composition:

Composed of large crystals of quartz, feldspar, and mica, often with rare minerals like tourmaline, beryl, and spodumene.

Types:

• Simple Pegmatite
• Complex Pegmatite
• Rare-element Pegmatite

Etymology:

Derived from the Greek word "pegma" meaning "framework" or "structure", referring to its interlocking crystal structure.

Uses:

• Gemstone mining
• Lithium extraction
• Collector specimens
• Jewelry

Distribution:

Found in Brazil, Madagascar, United States, Russia, and other regions with granitic intrusions

Historical Use:

Mined for gemstones and rare elements. Some pegmatite crystals can grow over 10 meters long.

Symbolism:

Represents rarity, beauty, and Earth's hidden treasures

What makes pegmatite special?

Pegmatite is known for its extremely large crystals, some of which can grow over 10 meters long, making them the largest crystals on Earth.

What minerals are found in pegmatite?

Pegmatite often contains rare minerals like tourmaline, beryl, spodumene, and other gem-quality crystals.