Chalcedony to as prase. However, the term prase is also used to describe green quartz, and to a certain extent is a color-descriptor, rather than a rigorously defined mineral variety.) Blue-colored chalcedony is sometimes referred to as "blue chrysoprase" if the color is sufficiently rich, though it derives its color from the presence of copper and is largely unrelated to nickel-bearing chrysoprase. Heliotrope is a green variety of chalcedony, containing red inclusions of iron oxide that resemble drops of blood, giving heliotrope its alternative name of bloodstone. In a similar variety, the spots are yellow instead, known as plasma. Moss agate
Heliotrope (color) Heliotrope (color) Heliotrope is a pink-purple tint that is a representation of the colour of the heliotrope flower. The first recorded use of heliotrope as a color name in English was in 1882. The color heliotrope gray is displayed at right. The first recorded use of "heliotrope gray" as a colour name in English was in 1912. The source of this colour is: "ISCC-NBS Dictionary of Colour Names" (1955)--Colour Sample of Heliotrope Gray (color sample #227) At right is displayed the colour old heliotrope. Another name for this colour is "old helio". The first recorded use of "old helio" as