EARTH SCIENCE-MINERAL

MELODY 11C

SHI GAO

石膏

GYPSUM•CHEMICAL FORMULA

•CaSO4·2H2O

•CATOGORY•SULFATE MINERAL

COMMON USE

•Gypsum board- a finish for walls and ceilings

•Gypsum blocks-cement blocks in building construction

• Plaster ingredient (surgical splints, casting moulds, modeling)

• In foot creams, shampoos and many other hair products

MINERAL PROPERTIES

MOHS HARDNESS: 2CLEAVAGE: PERFECT! (One direction of cleavage)LUSTER: Vitreous to silky, pearly, or waxyCOLOR: Clear, colorless, white, gray, yellow,

red, brownMAGNETISM: Not magneticSTREAK: WHITEEFFERVESCENCE: Gentle reaction

Gypsum is deposited from lake and sea water, as well as in hot springs, from

volcanic vapors, and sulfate solutions in veins.

Pure gypsum is white, but other substances found as impurities may give a wide range

of colors to local deposits.

THANKS FOR LISTENINGWORK CITED PAGE

http://www.baigoogledu.com/s.php?hl=zh-CN&q=gypsum

http://en.wikipedia.org/wiki/Gypsum#mediaviewer/File:Roses_des_Sables_Tunisie.jpg

http://geology.com/minerals/gypsum.shtmlwww.gypsum.org/about/gypsum-101/what-is-g

ypsum