일반명 : 황철석(볼평방입방결정) Pyrite(Ball flattened cubic crystals)

원산지 : Guang-Dong Province, China

크   기 : 36*30*25mm

Pyrite ae~Ballae(tm) ae" Location: Guang-Dong Province, China. Miniature. we have an unusual habit of pyrite. It forms as a ae~ballae(tm) of flattened cubic crystals. The pyrite forms as a complete ae~floater-likeae(tm) ball cluster that has a brass-yellow color and a metallic luster. Pyrite has such a wide variety of habits and this habit is definitely one of the more unusual.

THE MINERAL PYRITE

·    Chemistry: FeS2, Iron Sulfide

·    Class: Sulfides

·    Group: Pyrite

·    Uses: A very minor ore of sulfur for sulfuric acid, used in jewelry under the trade name "marcasite" and as mineral specimens.

Pyrite is the classic "Fool's Gold". There are other shiny brassy yellow minerals, but pyrite is by far the most common and the most often mistaken for gold. Whether it is the golden look or something else, pyrite is a favorite among rock collectors. It can have a beautiful luster and interesting crystals. It is so common in the earth's crust that it is found in almost every possible environment, hence it has a vast number of forms and varieties.

PHYSICAL CHARACTERISTICS:

·    Color is brassy yellow.

·    Luster is metallic.

·    Transparency: Crystals are opaque.

·    Crystal System is isometric; bar 3 2/m

·    Crystal Habits include the cube, octahedron and pyritohedron (a dodecahedron with pentagonal faces) and crystals with combinations of these forms. Good interpenetration twins called iron crosses are rare. Pyrite is commonly found in nodules. A flattened nodular variety called "Pyrite Suns" or "Pyrite Dollars" is popular in rock shops. Also massive or reniform and replaces other minerals and fossils forming pseudomorphs or copies.

·    Cleavage is very indistinct.

·    Fracture is conchoidal.

·    Hardness is 6 - 6.5

·    Specific Gravity is approximately 5.1+ (heavier than average for metallic minerals)

·    Streak is greenish black.

·    Other Characteristics: Brittle, striations on cubic faces caused by crossing of pyritohedron with cube. (note - striations on cube faces also demonstrate pyrite's lower symmetry). Pyrite (unlike gold) is not malleable.

·    Associated Minerals are quartz, calcite, gold, sphalerite, galena, fluorite and many other minerals. Pyrite is so common it may be quicker to name the unassociated minerals.

·    Notable Occurrences include Illinois and Missouri, USA; Peru; Germany; Russia; Spain; and South Africa among many others.

·    Best Field Indicators are crystal habit, hardness, streak, luster and brittleness.