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.
Pyrite is a very common mineral, found in a wide variety of geological formations from sedimentary deposits to hydrothermal veins and as a constituent of metamorphic rocks. The brassy-yellow metallic colour of pyrite has in many cases lead to people mistaking it for Gold, hence the common nickname 'Fool's gold'.yrite is commonly found to contain minor nickel, and forms a series with Vaesite; Bravoite is a nickeloan variety of pyrite.