Bloodstone (Heliotrope)
Madagascar
931.99 carats
© gemselect.com
In the trade, the term blood jasper is sometimes used. Bloodstone, however, is not a jasper at all, even though a radial structure with spherical aggregates can simulate a grainy appearance.
Bloodstone Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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Bloodstone Gemstones by Size
This table shows distribution of Bloodstone gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:3.9 cts
Heaviest:931.99 cts
Average:84.32 cts
Total photos:22
Do you have a larger Bloodstone? Why not upload a photo?
| General Information | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| A variety or type of: | Chalcedony, which is a variety of Quartz | ||||||||||
| Other Names/Trade Names: | |||||||||||
| Chemical Formula |
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| Physical Properties of Bloodstone | |||||||||||
| Mohs Hardness | 6.5 to 7, Blue Chart Gem Identification (2010) | ||||||||||
| Specific Gravity | 2.55 to 2.70, Blue Chart Gem Identification (2010) | ||||||||||
| Optical Properties of Bloodstone | |||||||||||
| Refractive Index | 1.530 to 1.543, Blue Chart Gem Identification (2010) | ||||||||||
| Optical Character | Uniaxial/+, Gemmological Tables (2004) | ||||||||||
| Birefringence | 0.003 to 0.009, Blue Chart Gem Identification (2010) | ||||||||||
| Colour | |||||||||||
| Colour (General) | Dark green/greenish-blue with small red blood-like spots, Management Team (2012) | ||||||||||
| Causes of Colour | Particles of chlorite or included hornblende needles cause the green color. Red spots are caused by iron oxide., Gemstones of the world (2001) | ||||||||||
| Transparency | Translucent,Opaque, Blue Chart Gem Identification (2010) Semi-transparent to opaque | ||||||||||
| Lustre | Waxy,Resinous, Gemstones (2009) | ||||||||||
| Crystallography of Bloodstone | |||||||||||
| Crystal System | Trigonal, Gemmological Tables (2004) | ||||||||||
| Habit | Fibrous to grained aggregate, Gemmological Tables (2004) | ||||||||||
| Further Information | |||||||||||
| Mineral information: | Bloodstone information at mindat.org | ||||||||||
| Significant Gem Localities | |||||||||||
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