Chemical Composition : SiO2 Silicon Dioxide
Hardness : 7.0
Specific Gravity (Density) : 2.60 – 2.65 (g/cm3)
Refractive Index : 1.543 – 1.554 Uniaxial ( + )
Bloodstone, also known as Heliotrope, is a type of Chalcedony which is a type of cryptocrystaline, or fine-grained, Quartz with a fibrous microstructure. This type of material is also called Plasma. Plasma is a microfibrous type of Chalcedony colored various shades of green by densly packed fibrous Actinolite crystals and including blood-red to orange spots of iron oxides or red Jasper that resemble blood spots. This material is always opaque and usually found as cabochons but may also be faceted. It is very attractive with its “blood” spots on a deep green background.
Bloodstone is found in India, Brazil and South Africa and more recently very fine examples are coming from Madagascar.