Bloodstone is a mineral with a hardness of 7 out of 10 on the Mohs scale of mineral hardness [?]. These Trigonally structured gems are made of silicon dioxide, their full chemical compound being SiO2.

Bloodstone is a member of the Chalcedony group. Why is it called Bloodstone? Well because in polished and rough form this gem / mineral looks like blood, on a stone. (see photo)

Bloodstone is sometimes referred to as Plasma or Heliotrope. Heliotrope is a birthstone for March. The name plasma is used to define a bloodstone with yellow inclusions, and not red ones.

Despite its relative hardness (7 out of 10 on the Mohs scale), this mineral is usually polished and not cut.

Typical bloodstone is dark green with red inclusions, but as stated earlier it is sometimes dark green with yellow inclusions.

The specific gravity [?] for Bloodstone is 2.61, it's refractive index [?] is 1.53-1.54, and it's double refraction [?] is 0.004.


Native Americans used Chalcedony in ceremonies. Chalcedony has also been used to create seals as far back as the bronze age.

Industrial Usages

It is sometimes used in the manufacturing of electronic devices.

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Double Refraction or dr is the ability of a mineral to separate a refracted ray of light into 2 rays. If held over an image or text it will display the object 2x its original size.

Mohs Scale of Mineral Hardness is the standard used to categorize a mineral's ability to resist scratching. It gets its name from Friedrich Mohs, the German geologist who first created the scale.

RI or Refractive Index defines light's ability to move through the mineral or in a general sense, any material.

SG or Specific Gravity is the ratio of the weight of any substance to that of pure water at temperature of 3.98°C(39.2°F) and standard atmospheric pressure. This is important to note when actively seeking these minerals in the wild. Minerals with a higher SG will settle below material with a lower sg over time.