Bloodstone: Green Chalcedony With a Spatter of Red

Short answer: bloodstone, also sold as heliotrope, is an opaque dark green chalcedony (SiO2) dotted with red spots of iron oxide, mostly hematite. It rates 6.5 to 7 on the Mohs scale with a specific gravity near 2.6 to 2.7. Most of the supply is mined and cut in India. The best pieces show a solid forest green ground with sharp, sparse red dots; stones crowded with yellow, white or brown markings are usually traded as fancy jasper instead.

What separates bloodstone from plasma and fancy jasper?

Bloodstone sits at the end of a chain of green chalcedony names, and the boundaries are set by color and pattern rather than chemistry.

• Prase is a lighter green, more translucent chalcedony.
• Plasma is the dark green, opaque version. The International Gem Society describes plasma as frequently found with white or yellowish spots and opaque due to densely packed actinolite crystals.
• Bloodstone is plasma with red. In the same IGS list, bloodstone, or heliotrope, is plasma with red and orange spots of iron oxide (International Gem Society).
• Fancy jasper is the catch-all once the red stops dominating. Geology.com explains that it is unusual to find green chalcedony whose markings are only red; when white, yellow, orange or brown markings outnumber the red, the material is usually called fancy jasper (Geology.com).

That last rule explains why a bag of tumbled "bloodstone" can look so mixed. Some pieces are textbook, some are plasma with a single red fleck, and some are honestly fancy jasper.

Is bloodstone chalcedony or jasper?

Both answers circulate, and both are defensible. Mineralogically it is chalcedony, the microcrystalline form of quartz. Because it is opaque, it also meets the working definition of jasper: Geology.com notes that opaque chalcedony is, by definition, a jasper, and that bloodstone keeps its own name simply because "bloodstone" is more specific. GIA splits the difference, calling it a variety of chalcedony that is traditionally semi-translucent to opaque dark green jasper with red inclusions of iron oxides (GIA). The older label "blood jasper" comes from that overlap.

What is bloodstone made of?

The quartz base supplies the hardness and the shell-shaped fracture. The color comes from guests inside it. Minerals.net attributes the solid green to dense inclusions of chlorite or amphibole minerals, and the red or brown spots to iron oxide impurities, especially hematite (Minerals.net). Geology.com adds pyroxene to the list of green contributors and points out a practical consequence: the included mineral matter, at least several percent by weight, is why bloodstone often tests slightly softer than pure quartz, about 6.5, and why it is opaque.

Minerals.net also notes that the green body often has uneven color, with lighter and darker green zones, or bluish-gray or dark yellow streaks. Those zones are normal and do not indicate dye.

How does bloodstone form, and where is it mined?

Bloodstone is a low-temperature stone. According to Geology.com, it forms at shallow depths and low temperatures by precipitation from silica-rich groundwaters in fractures and cavities. Fine silica gel or silica-saturated water fills a crack in host rock, green silicate fibers and iron oxide grains are trapped as it hardens, and the result is a vein or nodule of spotted chalcedony. GIA adds that bloodstone also turns up as pebbles in riverbeds, weathered out of those veins.

Localities, by source:

• India: the dominant producer today. Geology.com says most bloodstone used today is mined and cut in India.
• Madagascar, Brazil, China and Australia: listed by both Geology.com and Minerals.net; Minerals.net also lists Germany.
• United States: Geology.com records small deposits in California, Nevada, Oregon and Washington.

India's dominance has an odd twist that affects what reaches the gem trade. Geology.com reports that in India the finest-colored bloodstone is crushed and ground into powder for a folk remedy, a use that removes much of the best material from the gem and jewelry market. That is one reason a clean, strongly spotted cabochon is harder to find than the cheap price of tumbled stones suggests.

Why is it also called heliotrope?

The older name is Greek and refers to the sun. GIA explains that heliotrope comes from the ancient Greek for "to turn the sun", from a belief that the stone turned the sun red when placed in water. The Roman naturalist Pliny the Elder recorded the idea in Book 37 of his Natural History, writing that heliotropium is found in Æthiopia, Africa and Cyprus and is of a leek-green colour, streaked with blood-red veins (Pliny, Natural History 37.60). He added that the stone, placed in a vessel of water in full sunlight, throws back a reflected color like blood.

Pliny's account goes further, claiming the polished stone could show eclipses by reflecting the moon crossing the sun, and he mocked the magicians who said it could make a wearer invisible. Read it as history of ideas, not mineralogy. The useful part for a modern buyer is the color description: leek green with red veins is still a good picture of fine heliotrope. Geology.com notes that "heliotrope" survives mainly in European writing and in works of the 18th century and earlier.

How was bloodstone used in carving and jewelry?

Its toughness, opacity and lack of cleavage made it a carver's stone long before it was a bead stone. Minerals.net says bloodstone has been traditionally used as a seal stone. Geology.com describes it as historically a stone of men's jewelry, often cut with a signet design, set in a ring and used to seal documents and letters, and sometimes cut in relief or intaglio with a warrior's bust, a dragon or a family crest. GIA illustrates bloodstone among a group of engraved gems from the Roman Empire held by the J. Paul Getty Museum.

The Christian name came later. Geology.com connects the "bloodstone" name to people who relate the red spatter to the "Blood of Christ", a reading that gave the stone religious significance and explains part of its long popularity in Europe.

Today, Geology.com notes, top-quality material is almost always cut into cabochons, with some wands, small sculptures and bowls; middle and lower grades go into rock tumblers.

What imitations and look-alikes should you watch for?

Bloodstone is usually natural. Minerals.net states that it is usually naturally colored and not enhanced. The risks come from neighboring materials and from treatments common to chalcedony in general.

• Dyed green chalcedony. The IGS notes that dyeing is an ancient and common practice for chalcedonies because they are relatively porous, and that dyed green chalcedony shows weak absorption lines at 6450 and 6700 nm in a spectroscope. Dye in a bloodstone would show as unnaturally even, bright green, with color pooled in cracks.
• Heated chalcedony sold as red-spotted material. The same IGS page says almost any chalcedony can be turned red by heating because it contains finely disseminated iron compounds. Heat can intensify red patches, and it is undetectable, so spotting that looks orange-brown and blurred is worth questioning.
• Fancy jasper and plasma labeled as bloodstone. Not fakes, but lower grades. Count the red against the other colors.
• Chinese "chicken-blood stone." A different material entirely, despite the name. It is a soft carving stone colored by cinnabar, mercury sulfide, the chief ore of mercury, with a specific gravity of 8.0 to 8.1 (Minerals.net on cinnabar). It has no green chalcedony in it. Cinnabar-bearing stone should be handled with clean-hands discipline; see our toxic minerals handling guide.

A simple bench check: real bloodstone resists a steel knife, has a cool, glassy feel, and its red dots sit inside the stone, visible at slightly different depths under a 10x loupe at a thin edge.

How do you care for bloodstone?

Treat it as quartz with inclusions. The IGS says chalcedony requires no special care and suggests mild detergent, warm water and a soft brush. Because hematite spots can be slightly softer than the surrounding silica, avoid harsh abrasives that might dull them, and store bloodstone apart from harder gems such as sapphire or topaz.

What is bloodstone associated with in tradition?

In crystal traditions bloodstone is associated with courage and strength, a reputation that GIA traces back through its long use as an amulet. These are cultural beliefs, not measurable properties.

Choosing and buying bloodstone

Grade bloodstone by four things, roughly in this order:

1. Ground color. A deep, even forest green beats olive, gray or patchy green.
2. Red against everything else. Clear red dots, not orange or brown blotches, and red that outnumbers any white or yellow.
3. Pattern. Geology.com calls a solid deep green base with a light spray of contrasting red dots the most highly regarded, and rare. Heavy red veining is attractive but trades lower.
4. Polish and soundness. No pits at hematite spots, no fractures across the dome.

Some pieces we stock are worth comparing side by side:

• Bloodstone: small, inexpensive polished pieces, the right place to practice reading spot color and density from one stone to the next.
• Green Jasper Crystal Cube with Cut Corner Polished: a green jasper with no red, useful as a reference for what the base material looks like before the hematite arrives.
• Carnelian Palm Stones: the red side of the chalcedony family, translucent orange-red where bloodstone's red is opaque iron oxide. Read more in our carnelian guide.
• Chicken blood stone quartz specimen, 16.6 lb: a large display piece whose red is cinnabar, not hematite, showing exactly why the "blood stone" name alone tells you little. Handle with washed hands and keep it out of reach of children.

For the wider family, see our chalcedony guide and our agate guide.

Frequently asked questions

Is bloodstone the same as heliotrope?

Yes. Heliotrope is the older name, from the Greek for "turning the sun", used by Pliny the Elder and by European writers into the 18th century. Bloodstone is the common English trade name today. Both refer to dark green chalcedony with red iron oxide spots.

What makes the red spots in bloodstone?

Iron oxide, mostly hematite, trapped in the chalcedony as it formed from silica-rich groundwater. The green ground comes from tiny inclusions of chlorite, amphibole or pyroxene minerals. The spots are part of the stone, not a surface coating, so they cannot wash off.

How can you tell real bloodstone from a fake?

Check hardness first: chalcedony resists a steel knife. Look at a thin edge with a loupe for red dots at varying depths. Very uniform bright green suggests dye, and a stone that feels unusually heavy may be a cinnabar-bearing carving stone rather than bloodstone.

Where does the best bloodstone come from?

India supplies most of the bloodstone in the trade, and fine Indian material with deep green color and crisp red spots sets the standard. Bloodstone also comes from Madagascar, Brazil, China and Australia, with small deposits in several western US states.

Is bloodstone expensive?

Usually not. Tumbled stones and beads are cheap because middle grades are plentiful. Price climbs for cabochons and carvings with a solid deep green base and a light, clearly red spatter, a combination that is genuinely rare, and for antique engraved seals.

Sources

• Geology.com, Bloodstone: https://geology.com/gemstones/bloodstone/
• Minerals.net, The gemstone bloodstone: https://www.minerals.net/gemstone/bloodstone_gemstone.aspx
• GIA, March Birthstones: https://www.gia.edu/birthstones/march-birthstones
• International Gem Society, Chalcedony Value, Price, and Jewelry Information: https://www.gemsociety.org/article/chalcedony-jewelry-and-gemstone-information/
• Pliny the Elder, The Natural History, Book 37, Chapter 60 (Perseus Digital Library): http://www.perseus.tufts.edu/hopper/text?doc=Perseus:text:1999.02.0137:book=37:chapter=60
• Minerals.net, The mineral cinnabar: https://www.minerals.net/mineral/cinnabar.aspx
• Minerals.net, The gemstone chalcedony: https://www.minerals.net/gemstone/chalcedony_gemstone.aspx