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Elbaite is a sodium-lithium-aluminum borosilicate mineral, a member of the tourmaline group. It is renowned for its exceptional color diversity, ranging from colorless (achroite) to pink (rubellite), red, green (verdelite), blue (indicolite), and multi-colored (watermelon tourmaline). Its prismatic crystals often exhibit characteristic striations parallel to the c-axis. Elbaite is a complex mineral with a variable chemical composition, leading to its wide array of colors and properties.
How to Identify
- Color
- Extremely variable: colorless (achroite), pink to red (rubellite), green (verdelite), blue (indicolite), yellow, brown, black, or multi-colored (e.g., watermelon tourmaline with pink core and green rim).
- Luster
- Vitreous (glassy) to resinous.
- Texture
- Typically smooth on crystal faces, but often exhibits prominent vertical striations on prismatic faces.
- Crystal Form
- Typically forms elongated, prismatic crystals with a characteristic triangular cross-section (due to the trigonal crystal system). Terminations can be complex, often hemimorphic (different forms at opposite ends of the crystal). Can also be massive or columnar.
- Cleavage
- Indistinct to poor basal cleavage {0001} and prismatic cleavage {1120}. Fracture is more common than cleavage.
- Geological Environment
- Primarily in granitic pegmatites, especially lithium-rich types. Also found in some metasomatized metamorphic rocks and hydrothermal veins.
Key Facts
- Hardness: 7-7.5 (Mohs scale)
- Specific Gravity: 2.90-3.10 g/cm³
- Crystal System: Trigonal
- Color: Colorless, pink, red, green, blue, yellow, brown, black, multi-colored
- Luster: Vitreous to resinous
- Transparency: Transparent to translucent
- Fracture: Conchoidal to uneven
- Cleavage: Indistinct to poor basal {0001} and prismatic {1120}
- Composition: Sodium lithium aluminum borosilicate
Quick Check
- Color: Highly variable (pink, green, blue, colorless, multi-colored are common)
- Luster: Vitreous (glassy)
- Streak: White
Physical Characteristics
- Crystal Habit: Prismatic, often elongated, with vertical striations on prism faces; triangular cross-section; hemimorphic terminations common. Also massive or columnar.
- Cleavage Type: Indistinct to poor basal {0001} and prismatic {1120}
- Fracture Type: Conchoidal to uneven
- Tenacity: Brittle
- Luster Type: Vitreous to resinous
Formation
Elbaite forms primarily in complex granitic pegmatites, which are late-stage differentiates of granitic magmas. It crystallizes from highly evolved, volatile-rich (B, F, H2O) melts that are also enriched in incompatible elements such as Li, Na, and Al. It can also occur in some metamorphic rocks, particularly those metasomatized by pegmatitic fluids, and in hydrothermal veins.
Usage
Elbaite is highly prized as a gemstone due to its wide range of vibrant colors and excellent clarity. Gem-quality elbaite is cut into various shapes for jewelry. It is also a significant source of lithium, though not typically mined for this purpose alone. Fine mineral specimens are highly sought after by collectors.
Age Distribution
Typically found in pegmatites, which can range from Precambrian to Cenozoic in age, with many significant deposits being Mesozoic to Cenozoic.
Where to Find
Minas Gerais, Brazil
World-renowned for producing exceptional gem-quality elbaite in a wide range of colors, including rubellite, indicolite, and verdelite, often in large crystals.
Pala District, San Diego County, California, USA
Famous for its pink (rubellite) and green (verdelite) elbaite, often found in association with lepidolite and other pegmatite minerals.
Mogok, Myanmar (Burma)
Known for fine rubellite and other colored tourmalines.
Afghanistan and Pakistan
Significant sources of high-quality elbaite, including multi-colored specimens and fine blue indicolite.
Madagascar
Produces a variety of elbaite colors, including pink, green, and blue.
Elba Island, Italy
The type locality for elbaite, though significant gem production is no longer active. Historically known for fine specimens.
Finding Tips
Target Pegmatites
Focus your search on granitic pegmatites, particularly those known to be lithium-rich. Look for quartz, feldspar, and mica as primary constituents, and then search for accessory minerals like beryl, spodumene, and other tourmaline varieties.
Look for Crystal Habit
Elbaite typically forms prismatic crystals with vertical striations. Its characteristic triangular cross-section can be a key identifier even in fractured pieces.
Color Variation
Be aware of the wide range of colors. Don't dismiss a specimen just because it's not the 'typical' pink or green. Color zoning is also common and a good indicator.
Hardness Test
Elbaite is relatively hard (7-7.5 on Mohs scale), so it will scratch glass and steel. This helps differentiate it from softer minerals.
Associated Minerals
Elbaite is often found with quartz, feldspar (albite, microcline), muscovite, lepidolite, beryl, spodumene, and sometimes tantalite-columbite minerals.
Similar Rocks
Schorl
Schorl
Also known as: Black Tourmaline
Dravite
Dravite
Also known as: Brown Tourmaline
Uvite
Uvite
Also known as: Calcium-Magnesium Tourmaline
Scientific Classification
- Mineral Class
- Silicates
- Group
- Tourmaline Group
- Crystal System
- Trigonal
- Chemical Formula
- Na(Li,Al)3Al6(Si6O18)(BO3)3(OH)4
- Composition
- Sodium lithium aluminum borosilicate with hydroxyl
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