A mass of intergrown, striated pyrite crystalsEuhedral cubic pyrite crystals

- align=center bgcolor="#9966FF"	Pyrite		- align=center	-	- align=center bgcolor="#9966FF"	General		-	Category	Mineral	-	Chemical formula	iron disulfide (FeS2)	- align="center" bgcolor="#9966FF"	Identification		-	Colour	Pale, dull gold	-	Crystal habit	Cubic, faces may be striated, but also frequently octahedral and pyritohedron. Often inter-grown, massive, radiated, granular, globular and stalactitic.	-	Crystal system	Isometric; bar 3 2/m	-	Melting Point	1,177-1,188°C *	-	Cleavage	Poor	-	Fracture	Very uneven, sometimes conchoidal	-	Mohs Scale hardness	6 - 6.5	-	Luster	Metallic, glistening	-	Refractive index	Opaque	-	Streak	Greenish-black to brownish-black	-	Specific gravity	4.95 - 5.10	-	Fusibility	2.5-3	-	Solubility	insoluble in water	-	Magnetism	paramagnetic	-

The mineral pyrite, or iron pyrite, is iron disulfide, FeS₂. It has isometric crystals that usually appear as cubes. The cube faces may be striated (parallel lines on crystal surface or cleavage face) as a result of alternation of the cube and pyritohedron faces. Pyrite also frequently occurs as octahedral crystals and as pyritohedra (a dodecahedron with pentagonal faces). It has a slightly uneven and conchoidal fracture, a hardness of 6–6.5, and a specific gravity of 4.95–5.10. It is brittle, meaning it breaks or powders easily. Its metallic luster and pale-to-normal brass-yellow hue have earned it the nickname fool's gold, but ironically, small quantities of actual gold are sometimes found in pyrite. In fact, such auriferous pyrite is a valuable ore of gold.

Pyrite is the most common of the Sulfide minerals. It is usually found associated with other sulfides or oxides in quartz veins, sedimentary rock and metamorphic rock, as well as in coal beds, and as the replacement mineral in fossils.

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netouyo3 (○○ねとうよ探偵) Tue, 29 Dec 2009 10:04:23 -0000
RT:@shiriuma 海賊の身代金の相場って4億円くらいなんだなぁ。かなり上がってるようだ。RT @somaliapirates: Pyrites win again: MOGA
海賊の身代金の相場って4億円くらいなんだなぁ。かなり上がってるようだ。RT @somaliapirates: Pyrites win again: MOGADISHU, Somalia - A band of Somali pirates http://bit.ly/8gyTd5
shiriuma (マウリーシ・ハーリド・ビン・アルワリード) Mon, 28 Dec 2009 23:23:05 -0000
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somaliapirates (Captain Patch) Mon, 28 Dec 2009 23:12:50 -0000
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