An Achene is a single-seeded dry indehiscent fruit in which the seedcoat is not part of the fruit coat. This is the fruit of a Sunflower (Helianthus annuus). Other fruits of this type are: Buttercup (Ranunculus), Clematis (Clematis), Coreopsis (Coreopsis), Dahlia (Dahlia), English Marigold (Calendula), Zinnia (Zinnia).
Pyrite is used in the production of sulfur and sulfuric acid. Pyrite is sometimes an ore of gold and copper.It is also an ore of sulfur, which is used in the production of tires, explosives, disinfectants, medicines, ink, wood preservatives, dyes, matches, and sulfuric acid. Some collector specimens can be quite valuable as well.yrite is used in the production of sulfur and sulfuric acid. Pyrite is sometimes an ore of gold and copper.
The only common mineral that has properties similar to pyrite is marcasite, a dimorph of pyrite with the same chemical composition but an orthorhombic crystal structure. Marcasite does not have the same brassy yellow color of pyrite.Instead it is a pale brass color, sometimes with a slight tint of green.owever, pyrite is often associated with gold. The two minerals often form together, and in some deposits pyrite contains enough included gold to warrant mining. Hand-specimens of pyrite are usually easy to identify. The mineral always has a brass-yellow color, a metallic luster and a high specific gravity.