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 Books press, Heliotrope works closely with neighborhood bookshops and local entertainment venues including The Strand Bookstore, St. Mark's Bookshop, Dixon Place, The Red Room at KGB Bar, and Theatre 80 St. Marks. Heliotrope Books Heliotrope Books is an independent publisher based in Lower Manhattan. Founded and operated by Naomi Rosenblatt, Heliotrope specializes in cross-genre books with mixed sales categories, memoirs by journalists (including the "memoir-noir", a category coined by Heliotrope), and fiction set in New York City. Heliotrope also publishes a line of children's books under the imprint HelioTot. Notable authors include humorist entrepreneur Richard A. Moran; award-winning professor and bestselling