What is zi ran tong,Zirantong pyritum,iron pyrites FeS2?

Basic Data of Fool's Gold.

Pyritum Extract Zirantong Pyritum iron pyrites FeS2 Extract photo picture image Pyrite (Fool's Gold)
Pharmaceutical name: Pyritum
Name: Pyrites
Other Names: Pyrite, iron pyrites, fool's gold
Chemical name: iron pyrites
Chemical Composition: Iron Disulfide (FeS2)
Pron. in Cantonese: ji jin tong
Common Name: pyrite,fool's gold
Properties (characteristics): acrid, neutral
Hardness: 6-6.5
Specific Gravity: About 5.00
Color: Opaque brassy yellow
Luster: Metallic
Distribution: Sichuan, Guangdong, Jiangsu, Yunnan and all over the world

Common Form: Cubic crystals, typically striated, also pyritohedrons (12 5-sided faces) and less commonly octahedrons. Also frequently occurs in granular massive form, and sometimes as fibrous radiating nodules. Separate grains occur in many types of rock.

Sources: Common in pneumatolytic and hydrothermal veins, and in sedimentary deposit. Sources of good crystals include Rio Tinto, Spain; Utah, Nevada, Pennsylvania, Colorado, Illinois, Vermont; Mexico; Italy; Isle of Elba; Germany; Austria; Yugoslavia; Czecholsovakia; Ural Mts; Cornwall, England
Cutting: Commercially, pyrites furnishes the stone usually sold as marcasite, for which purpose it is normally cut with six triangular facets and a flat base.