gemstone
Heliodor (Yellow Beryl)
Beryl (Be3Al2Si6O18 with iron impurities)
Hardness: 7.5-8.0 (Mohs). Color: Pale yellow to golden yellow. Luster: Vitreous. Crystal Structure: Hexagonal. Specific Gravity: 2.63-2.90. Cleavage: Imperfect basal.
- Hardness
- 7
- Color
- Pale yellow to golden yellow
- Luster
- Vitreous
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Physical properties
Hardness: 7.5-8.0 (Mohs). Color: Pale yellow to golden yellow. Luster: Vitreous. Crystal Structure: Hexagonal. Specific Gravity: 2.63-2.90. Cleavage: Imperfect basal.
Formation & geological history
Heliodor forms in granitic pegmatites and metamorphic rocks like mica schists. The yellow color is caused by trace amounts of Iron (Fe3+) ions replacing aluminum in the crystal lattice.
Uses & applications
Primarily used as a gemstone in high-end jewelry and as a sought-after mineral specimen for collectors.
Geological facts
The name 'Heliodor' is derived from the Greek words 'helios' (sun) and 'doron' (gift). It is in the same mineral family as Emerald and Aquamarine.
Field identification & locations
Identify by its high hardness, hexagonal crystal habits (when raw), and pale yellow color. Commonly found in Brazil, Namibia, Madagascar, and Russia.
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