mineral
Emerald / Fluorite
Beryl (Be3Al2Si6O18) / Fluorite (CaF2)
Hardness: 7.5-8 (Emerald), 4 (Fluorite). Color: Vivid green to dark green (Emerald), Green/Purple (Fluorite). Luster: Vitreous. Crystal structure: Hexagonal (Emerald), Isometric (Fluorite).
- Hardness
- 7
- Color
- Vivid green to dark green (Emerald), Green/Purple (Fluorite)
- Luster
- Vitreous
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Physical properties
Hardness: 7.5-8 (Emerald), 4 (Fluorite). Color: Vivid green to dark green (Emerald), Green/Purple (Fluorite). Luster: Vitreous. Crystal structure: Hexagonal (Emerald), Isometric (Fluorite).
Formation & geological history
Emeralds form in pegmatites or hydrothermal veins when beryllium is present alongside chromium or vanadium. Fluorite forms in hydrothermal veins through circulating hot water. Often associated with volcanic activity and metamorphic zones.
Uses & applications
Primary use is in high-end jewelry and gemstone collecting. Beryl is also an ore of beryllium, used in specialized aerospace alloys. Fluorite is used as a flux in steel making and for manufacturing hydrofluoric acid.
Geological facts
Emeralds are one of the 'Big Four' precious gemstones. The inclusion-heavy nature of emeralds is often referred to as 'jardin' (French for garden). Pure fluorite is colorless; its vibrant colors come from impurities.
Field identification & locations
Identify emerald by its specific green hue and inclusion patterns. Fluorite can be identified by its relative softness (scratched by glass) and perfect octahedral cleavage. Often found in Colombia, Zambia, and Brazil (Emerald) or China and Mexico (Fluorite).
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