Heliodor
Variety Be3Al2Si6O18
Also called Golden beryl
About it
Yellow to greenish yellow beryl coloured by iron; some keep the name heliodor for greenish yellow and golden beryl for pure yellow. Sources include Ukraine, Brazil, Namibia, and Madagascar.
- Type
- Variety
- Group
- Beryl variety
- Formula
- Be3Al2Si6O18
- Hardness (Mohs)
- 7.5–8
- Specific gravity
- 2.67–2.9
- Streak
- white
- Lustre
- vitreous (glassy)
- Crystal system
- Hexagonal
- Colours
- yellow, golden yellow, greenish yellow
- Transparency
- transparent, translucent
- Cleavage and fracture
- imperfect basal; conchoidal to uneven fracture
Typical values: real specimens vary. For more, see mindat.org.