Bloodstone
Variety SiO2
Also called Heliotrope
About it
Dark green chalcedony or jasper spotted with red iron oxide, like drops of blood. Most comes from India; a traditional March birthstone.
- Type
- Variety
- Group
- Quartz variety (chalcedony)
- Formula
- SiO2
- Hardness (Mohs)
- 6.5–7
- Specific gravity
- 2.57–2.64
- Streak
- white
- Lustre
- waxy, vitreous (glassy)
- Crystal system
- Trigonal
- Colours
- dark green with red spots
- Transparency
- opaque, translucent
- Cleavage and fracture
- none; conchoidal to uneven fracture
Typical values: real specimens vary. For more, see mindat.org.