Bloodstone is a dark green to dark bluish-green variety of Chalcedony
that is speckled with red or brown spots. The spotting appears similar to blood stains, as is indicative of the name of this gemstone. The spots may be very sparse to almost non-existent, or they may be very dense and interwoven. Bloodstone may also have red markings as stripes or veins, though spotting is the most prevalent and desirable habit.
| Chemical Formula | SiO2 |
| Color | Red, Green, Brown, Multicolored |
| Hardness | 7 |
| Crystal System | Hexagonal |
| Refractive Index | 1.54Â -Â 1.55 |
| SG | 2.63Â -Â 2.65 |
| Transparency | Opaque |
| Double Refraction | .009 |
| Luster | Vitreous |
| Cleavage | Indiscernible |
| Mineral Class | Quartz (Chalcedony) |
that is speckled with red or brown spots. The spotting appears similar to blood stains, as is indicative of the name of this gemstone. The spots may be very sparse to almost non-existent, or they may be very dense and interwoven. Bloodstone may also have red markings as stripes or veins, though spotting is the most prevalent and desirable habit.
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